ANTARCTICA SCIENCE PAGE

 

 

ICEBERG

 
Bergs with minds of their own: Daring science mission targets giant slabs of ice By Josh Landis Sun staff

A handful of giant icebergs are hanging out right around the corner from Ross Island. As far as icebergs go, they haven’t done a whole lot since breaking off the Ross Ice Shelf. But a lot of people are keeping a close eye on them because of what they could teach us about bergs and their interactions with the environment and for the impact they could have on the entire U.S. Antarctic Program.

This summer, a team of researchers will fly by helicopter and attempt to tag two of them with weather stations and GPS tracking devices. They’re hoping the data they get will help them decipher the slow dance of these and other super-sized icebergs.

It started with B-15.

B-15 was a tabular berg that broke off the ice shelf in March. It measured 180 miles long and 25 miles wide more than twice the size of Delaware and was probably the largest iceberg ever seen. The only other contender was spied in 1956, but its size could not be confirmed.

“B-15 is simply the largest floating object we’ve ever witnessed,” said Doug MacAyeal, Professor of Geophysical Sciences at the University of Chicago and lead investigator on the tagging mission. “It’s like an aircraft carrier that could take the entire air force. It’s hard to imagine the size of it.”

Instead of drifting north through the Ross Sea like most pieces that come off the shelf, B-15 stayed close to home and eventually broke into several pieces, now called B-15A, B-15B, etc.

Big bergs

· Before it broke apart, B-15 was about the size of Jamaica and weighed an estimated 4 trillion tons.

· If melted over all the arable land in the world, the water frozen in B-15 (now B-15A and B-15B) would measure more than 6 inches.

·Most icebergs that calve off the Ross Ice Shelf are thought to be a thousand feet thick or more, only 10 percent of which floats above the surface.

·A giant berg that broke off the Ross Ice Shelf in 1987 still survives after running aground south of Australia.

MacAyeal’s project will look at the different ways in which large and small bergs behave and give clues as to how the continent would react to a warmer world.

“If we want to know how Antarctica will respond to climate warming, why not ride along when a piece of Antarctica goes north to where it is naturally warmer,” he asked.

“This is nature’s experimental opportunity to see how a chunk of ice responds to changed environmental conditions.”

The lumbering giants, named B-15A, -B, -C, and -D (see above picture), have meandered along with a few other bergs near the edge of the ice shelf as currents, tides and winds compete for control over their fate. Recently, B-15A collided with part of the shelf and created a new iceberg, B-20.

Currents have had the biggest effect on their movement, according to Stan Jacobs, of Columbia University’s Lamont-Doherty Earth Observatory. He says the bergs are slowly making their way north, but could be around for a long time.

“If they go aground on the continental shelf, they could last many years,” said Jacobs. It all depends on their course. “Once they get out into the circumpolar current, most icebergs probably do not last more than a year.”

There’s one place nobody wants to see a large iceberg go: McMurdo Sound. One of the smallest in the group, B-20, is within sight of the north side of Ross Island.

If B-20 (now named C-16A) — or the larger B-15A — ends up in the path of the icebreaker and re-supply vessels, the impact on operations at McMurdo and South Pole stations would be major. It would prevent the annual arrival of millions of gallons of heating, power and airplane fuel, and millions of pounds of cargo.

“We’d have to make significant adjustments to our planned program activities,” National Science Foundation representative Dave Bresnahan said.

Fortunately, the experts watching B-15A and nearby icebergs don’t think there’s much chance of a worst-case scenario.

“The chances of B-20 (now named C-16A) or B-15A blocking the sound are getting slimmer and slimmer,” said MacAyeal. “Once the Ross Sea (is clear of winter ice), everyone expects the icebergs to make more progress to the north.”

When asked how concerned he was that one of the bergs might enter McMurdo’s shipping lanes, Jacobs simply replied, “Not very.”

OLDEST LIVING CREATURE

 
Scientists Discover Oldest Living Creature By Patricia Reaney

LONDON (Reuters) – Scientists in the United States have revived a 250-million-year-old bacteria that is believed to be the oldest living creature ever discovered.

The bacterium that lived millions of years before the dinosaurs was in a state of suspended animation in an ancient salt crystal in an underground cavern near Carlsbad, New Mexico.

“From a biological standpoint this is extremely significant because quite literally this organism is the next best thing to having been there,” Russell Vreeland, a microbiologist at West Chester University in Pennsylvania, said in a telephone interview.

Hundred-million-year-old fossils and rocks give geologists clues about the Earth’s past but until now researchers have not had anything to reveal the secrets of life that long ago.

“Now we have at least one organism that goes back that far that we can ask biological questions of…something that we couldn’t do before,” Vreeland added.

Protective Shell Saved It From The Elements

The fact that Vreeland and his colleagues were able to bring the sleeping bacterium, called Bacillus permians, back to life after so long opens up the possibility that bacterial spores could live indefinitely.

“If something can survive 250 million years, what’s the difference in another 250 or longer,” Vreeland said.

The bacterium was trapped in a tiny brine pocket in the salt from ancient rock formations.

“It was completely protected,” said Vreeland, whose research is published in the science journal Nature.

“It was able to shut itself down into a protective spore and once it was encased within this particular type of rock it found itself in the most stable environment that you could imagine.”

The scientists carefully drilled into the crystal under the most sterile conditions, extracted fluid from it, placed the fluid in sealed test tubes and incubated it until it grew.

The extraordinary age of the bacterium also begs the question of whether organisms can survive long enough to travel between planets.

“If an organism were encased in a crystal and blown off a planet somewhere, or blown off of this one due to a meteor collision, it has a reasonable probability of surviving long enough to travel not just from planet to planet but solar system to solar system,” Vreeland said.

The scientists are comparing the bacterium to its modern relatives and are now looking for even older organisms.

“We are already starting to look at some 500-million-year-old and 800-million-year-old samples and we’re working on some that are even older than that,” Vreeland added.

RIVER ONYX

 
Going with the flow; By Josh Landis; The Antarctic Sun

Standing on the bank of the biggest river in Antarctica, the other side looks little more than a running jump away. It’s tempting to try to make the leap, but the water is too cold for a slip in the stream, and nearby rocks serve as convenient stepping-stones.

Doctoral student and researcher Mike Gooseff, however, is up to his boot-covered ankles in the icy Onyx River. He balances a long, shiny metallic instrument on the streambed and calls out numbers to fellow researcher Ethan Chatfield, who’s perched by the water’s edge recording the data in a notebook. The instrument, which looks like a golf club, measures the depth and velocity of the water at intervals across the stream. When all the numbers are crunched, the stream’s volume and flow will be determined.

“Listen to that raging,” exclaimed Gooseff upon hearing the river at its strongest, swiftest part. The sound of gurgling and rushing is strange for a place where water is most often locked in place by the cold.

Gooseff and Chatfield, along with hydrologist Jon Mason, are the Stream Team, and it’s their job to monitor 18 gauges set up at numerous streams in the Dry Valleys. Their work is part of the National Science Foundation’s Long Term Ecological Research Network. The goal of LTER is to chart ecological changes over long periods of time and across many different environments. Eventually, it is hoped, the information will provide a better picture of how the earth is changing.

At first glance, calling a contemporary research project “long term” in a place where rain hasn’t fallen in as many as two million years may seem oxymoronic. But the Onyx and other Dry Valley streams are the faintest, most finicky tendrils of enormous bodies of water flowing frozen out of the mountains. The slightest change in their behavior should, theoretically, magnify a less detectable shift in the Earth’s overall environment.

It’s an idea the NSF believes in. Since 1980, 21 LTER sites have been established from the Arctic to the Antarctic. Each one encompasses a unique ecosystem. The Dry Valleys, which joined the network in 1993, constitute polar desert oases. Work there is focused on microbial life, lakes, and streams. The LTER site near Palmer Station, on the other hand, looks at polar marine life, including krill and seabirds.

The Onyx River is a unique body of water situated in a rare valley on an incomparable continent. Its drainage pattern is the opposite of any surrounding areas. The river runs only during the warmest months. The rest of the year it is frozen solid. And it runs into the middle of Wright Valley, pooling at a place called Lake Vanda. The flow of the Onyx into the dead-end Vanda is countered by the constant winds that sweep the valley, evaporating the water and ablating the ice.

“It’s been a good season,” said Gooseff. “It’s a little disappointing that we have four streams that haven’t flowed (much), but other than that things are going well.”

In addition to his Stream Team duties, Gooseff is exploring other aspects of the environment. He’s concentrating on the saturated areas around the flow, called hyporeic zones. It’s an area where a lot of chemistry and biology take place, but little is known about it.

“I want to know how the water that moves in and out of the stream is influenced by the sediments,” said Gooseff. “Coupled with that is nutrient dynamics, like what kind of transformations do you see?”

A transformation of a different kind that’s being seen more and more is the increased presence of humans in the timeless terrain. Indeed, things change more slowly in the Dry Valleys than most anywhere on earth.

Ancient, mummified seal carcasses are still covered with skin and fur. Drainage patterns from ice that melted hundreds or thousands of years ago furrow the ground. And footsteps in the loose, fluffy moraine mark the place where people have been whether it was yesterday or decades ago.

The same fragility that makes the Dry Valleys an ideal place to chart global change also makes them extremely susceptible to those who tread there.

Like Gooseff, Chatfield is working on another project of his own. He’s looking at the re-growth rate of algae in and around the streams, as part of the assessment of human impact in the area.

“If algae were destroyed by walking,” he asks, “how long would it take to grow back?”

It’s a question that so far has no definitive answer. It’s also one that needs to be answered, for the number of people in the valleys tourists and scientists alike is on the rise.

DIFFERENT COUNTRIES IN ANTARCTICA

 
A frozen melting pot: The world comes together in Antarctica Compiled by Jeff Inglis

Antarctica is the second-smallest continent, home to over 100 research stations run by 29 countries. Here is a brief look at the activities of the other nations conducting research in Antarctica.

Argentina is operating 12 stations, six year-round, and six summer-only. Its program began in 1904, when a remote weather station was installed on Laurie Island in the South Orkneys. Argentina participates in a number of cooperative efforts with Antarctic Treaty members and consultative parties, including U.S. institutions. (Website: http://www.dna.gov.ar/)

Australia has four major bases in Antarctica. The Australian program started in 1947, with the first Australian National Antarctic Research Expedition. The program involves about 400 people each year, including 250 researchers. Wintering teams number 15 to 20 per station. Annual budget: $46 million (Website: http://www.antdiv.gov.au/)

Belgium is not currently operating any permanent stations or bases. The country is a founding member of the Antarctic Treaty. Its scientific research program began in 1985, and has consisted of a series of three-year studies by university-based scientists. (Website: http://www.belspo.be/antar)

Brazil operates one research station, Ferraz, on King George Island.(Website: http://www.mar.br/~secirm/proantar.htm)

Bulgaria operates one research station, St. Kliment Ochridski, on Livingston Island.

The first Bulgarian to visit the Antarctic went with the 13th Soviet Antarctic Expedition in 1967-1969. Since then, several scientists have traveled to Antarctica with the British, Soviet and Spanish programs. An ice-core drilling project is in development, as are improvements to the base infrastructure.

Canada is not operating any bases. In 1993 the Canadian Antarctic Research Program began to expand Canadian polar studies to the southern hemisphere. Canada publishes a newsletter on Antarctic research and maintains a database of individuals and organizations interested in Canadian Antarctic work.

One goal of the Canadian program is to exchange foreign access to Canadian research sites in the Arctic for Canadian access to other countries’ sites in Antarctica. (Website: http://www.polarcom.gc.ca/)

Chile has 10 stations in Antarctica, four permanent and six summer-only. Chile participated in the International Geophysical Year (1957-1958), but sent its first expedition to the Antarctic in 1916. (Website: http://www.inach.cl/)

China runs two stations in the Antarctic. In January 1980 the first Chinese scientists traveled to Antarctica to visit Australia’s Casey Station. In February 1985 the first Chinese station, Great Wall Station, was established on King George Island in the South Shetlands. In winter, the two Chinese stations house 35 to 45 people combined, and up to 100 during the summer.

Ecuador, though a member of COMNAP, is not currently operating any permanent stations or bases.

Finland runs one summer-only station, Aboa in Queen Maud Land. At the site is a year-round automated weather station. Finland’s first large expedition was in 1989, involving scientists at Aboa and on the Aranda. Finland often cooperates with Norway and Sweden, as well as conducting long-term ozone research with Argentina. (Website: http://www.fimr.fi/)

France has four stations, including its shared station with Italy at Dome C. Researchers winter at two of the stations, Dumont d’Urville and Charcot in Adelie Land. Dumont d’Urville’s population varies from about 26 in the winter to 80 in the summer. Annual budget: $9 million, plus $15 million for administration. (Website: http://www.ifremer.fr/ifrtp/)

Germany operates two stations. Neumayer Station has a winter population of 9 or 10, and a summer contingent of about 60. A cleanup of former East German Antarctic research stations is underway as part of the program’s environmental monitoring effort. (Website: http://www.awi-bremerhaven.de/)

India has one Antarctic research station, Maitri, in Queen Maud Land. In 1981 the first Indian Antarctic Expedition began the program. It joined the Antarctic Treaty consultative nations in September 1983, just after the first Indians wintered on the Prince Astrid Ice Shelf.

Italy operates two stations, including its joint station with France, Concordia, at Dome C. It signed the Antarctic Treaty in 1981, and began Antarctic research in 1985. The main station at present, Terra Nova Bay station, can hold 70 people. Cooperation in logistics and science between Italy, the U.S., and New Zealand has increased significantly. Annual budget: $35 million (Website: http://www.pnra.it/)

Japan operates four stations in Antarctica. Its first expedition was on board the Soya in 1956. Research programs have been done every year since then. Annual budget: $35 million (Website: http://www.nipr.ac.jp/)

Korea has one station, King Sejong, operating year-round on King George Island. Korea has been conducting Antarctic research since 1987. King Sejong’s population numbers about 15 in the winter and up to 60 in the summer. (Website: http://www.kordi.re.kr)

Netherlands is not currently operating any stations or bases. One of the major research policies is not constructing new research facilities, but instead using the infrastructure of other nations in collaborative efforts. Sailors from the Dutch East India Company sighted several sub-Antarctic islands in the 16th century. The Netherlands has been engaged in scientific researching since the mid-1960s, when three expeditions were developed in collaboration with Belgium. In 1990-1991, the Netherlands rented half of the Polish Arctowski Station, rather than build their own facilities. Projects involve collaboration with German, U.K., Australian, and New Zealand researchers, among other nations. Annual budget: $1.8 million (Website: http://www.nwo.nl/english/alw/programmes/antarctica)

New Zealand runs one base, Scott Base, on Ross Island, which has been occupied since the International Geophysical Year. Scott Base has a peak summer population of 86, which drops to 10 in the winter. The program uses Arrival Heights for some research, as well as maintaining eight research and emergency shelters in the Ross Sea and the Dry Valleys. Christchurch, New Zealand, is a major gateway to the Antarctic, where the U.S., New Zealand, and Italian research programs have offices. The New Zealand program also supports the Antarctic Heritage Trust, which protects and maintains the historic huts and sites of the Ross Sea area. New Zealand is heavily involved in collaborations, partnering in the six-nation Cape Roberts Project, as well as other projects with the United States, Italy, France, Chile, Sweden, Switzerland, South Africa, China and Australia. Annual budget: $8 million (Website: http://www.antarcticanz.govt.nz/)

Norway runs two stations, both in Queen Maud Land. Norway participates with Sweden and Finland in shared responsibility for Antarctic expeditions. 1996 annual budget: $6 million (Website: http://www.npolar.no/)

Peru operates one station, Macchu Picchu, in the region of the Antarctic Peninsula.

Poland has one station, Arctowski, on King George Island. In 1976 Poland began research in the Antarctic with five marine expeditions to the South Shetlands. The Arctowski station opened in 1977 and has operated continuously since then. The base houses 70 people in summer and 20 in winter. Collaborative projects join twelve Polish institutes and universities, as well as institutions in Belgium, Brazil, Germany, and the Netherlands.

Russia runs eight stations, three summer-only and five year-round, including Vostok, on the polar plateau. In 1956 the Soviet Union began research in Antarctica. The research was run primarily in institutes based in what became the Russian Republic. Russia succeeded the U.S.S.R. in the Antarctic Treaty system. The year-round stations together house 144 year-round personnel, while the summer season sees an increase of 162 people. The country has economic difficulties which has made Antarctic research difficult to maintain. International collaboration has been part of the process by which Russia has maintained a high level of research while cutting costs significantly. 1995 annual budget: $10.5 million

South Africa operates two stations, the larger of which is SANAE IV in Queen Maud Land. There is also a year-round weather station on Gough Island. South African Antarctic research began in the International Geophysical Year. South Africa was an original signatory of the Antarctic Treaty. Annual budget: $500,000 (Website: http://home.intekom.com/sanae/)

Spain has two stations, both in the South Shetland Islands. It also has an ice-strengthened vessel, the Hesperides. All three operate only in the summer; the stations can house 12 people each, while the ship can host 30 scientists, plus the crew. Annual budget: $6 million

Sweden has two stations, both in Queen Maud Land. Sweden has long been involved in Arctic research. In the 1980s it extended its research to the Antarctic. Sweden, Finland and Norway have an agreement to share expedition costs and research benefits. Collaborative efforts are also under way with the British, the U.S., and other European Antarctic research organizations. (Website: http://www.polar.kva.se/)

Ukraine operates one research station, Vernadsky, on the Antarctic Peninsula.

United Kingdom has four stations in Antarctica. U.K. scientists have been active in Antarctic research for over 75 years. The British Antarctic Survey has been the primary Antarctic planning and coordination organization for the past 56 years. About 40 staff spend the winter at the four stations combined. In the summer, field parties deploy primarily from Rothera, the largest base, which can house 120. The program has 180 scientists among its 420-person staff. Recently research collaboration has increased, especially with Germany. Annual budget: $42 million (Website: http://www.antarctica.ac.uk/)

United States operates three year-round stations, a number of smaller field camps on a summer-only basis, and unattended year-round observatories. 1995 annual budget: $197 million (Website: http://www.nsf.gov/od/opp/arctic/iarpc/start.htmstart.htm)

Uruguay has one station on the continent, Artigas, on King George Island. In 1776 the country first issued licenses for fishing in the southern seas. The first Antarctic research began in 1975, with the first expedition to the continent in 1984. This information is condensed from material located at http://www.comnap.aq, the website of the Council of Managers of National Antarctic Programs.

ANTARCTIC COD

 
Fishing for antifreeze By Aaron Spitzer The Antarctic Sun

Inside a small orange hut on the frozen surface of McMurdo Sound, a group of researchers huddled near the rim of a gaping hole in the 10-foot-thick ice. As a gas-powered winch reeled in a thin steel cable, the form of a giant fish appeared from the aquamarine depths.

“This may be the largest one we’ve caught this year,” said Kevin Hoefling, peering down through the icy water. He slowed the winch and the group leaned in closer. A betting pool quickly placed the creature’s weight at around that of an average-sized man.

In a few seconds the seawater sloshed and the fish’s head appeared enormous and prehistoric, with protruding eyes and powerful jaws lined with inward-angled teeth. Its massive, muscular body was wrapped in a whitish-gray skin of scales. Its fins folded and unfolded like translucent Japanese fans.

The creature was Dissostichus mawsoni, known colloquially as the giant Antarctic cod.

A few moments after breaking the surface, the mawsoni was wrestled off the hook and laid out and measured on a long wooden tray. Dripping with icy-cold seawater, the fish was then hoisted onto a nearby scale.

It turned out to be smaller than expected. At 110 pounds it was hardly a record. In past years, researchers in McMurdo Sound have reeled in cod topping twice that weight.

But the mawsoni was still the largest of the five that was caught that day. The other slimmer versions of this motley monster were all released back into the ice hole, where, after taking a moment to get their bearings, they quickly swam down and away.

Antarctic cod and many of their smaller cousins are the subjects of ongoing research by the husband-and-wife team of Art DeVries and Chris Cheng-DeVries, both scientists at the University of Illinois.

Art DeVries, a McMurdo institution himself, has been traveling to the Ice for more than three decades, examining the mechanism by which Antarctic fish avoid freezing.

Swimming in a sea that is below 32 F, the cold-blooded creatures run the constant risk of ice crystals forming in their blood. Once a single crystal enters, others can nucleate around it, precipitating a potentially deadly chain reaction.

While subsurface seawater stays liquid due to its high salt content, fluids in fish don’t share the same advantage. What they do have, as Art DeVries discovered years ago, is antifreeze.

Fish antifreeze isn’t like the antifreeze in your car, explained Cheng-DeVries. It doesn’t lower the actual freezing point of the fish’s blood. Instead, she said, “it inhibits the preferred direction of growth of the ice crystals.”

Ice crystals, she explained, are laid out like flat hexagons. They expand when other hexagons interlock on their six exposed sides, forming a pattern like that on a soccer ball.

But in the super cooled waters of the Antarctic, fish in the family notothenioid which includes the giant mawsoni generate a substance called antifreeze glyco protein, or AFGP. AFGP circulates in their blood and beats any ice crystals to the punch, surrounding them, binding to their sides and thus arresting crystal growth.

This discovery has taken the DeVries’ research in a range of different directions.

According to Cheng-DeVries, they’re still studying how AFGP binds to ice, an odd act in the molecular world. “Most proteins interact with other proteins,” she said. “These guys interact with ice.”

In a completely different vein, the researchers are also conducting genetic studies of AFGP to help determine when Antarctica began the dramatic cooling trend that converted it from a mild environment to the ice continent of today.

According to Cheng-DeVries, notothenioids evolved AFGP as a response to that climatic shift, while non-adaptive species died out. By calculating when AFGP arose, the timing of the continental cold snap can be better determined.

A third avenue of inquiry involves the formation of AFGP in embryos. Because the fish spawn and fertilize their eggs externally, the eggs must develop antifreeze early on, to protect them from their frigid surroundings.

According to Cheng-DeVries, that mystery will likely bring the research team back to McMurdo Sound during Winfly next season, so they can follow the fish eggs throughout their developmental cycle.

As for the 110 pound mawsoni hauled in on the winch, it has come to the end of its cycle. Giving its life to science, it goes into a long trough called the “fish coffin,” in which it is transported from the fishing hut back to the old aquarium at the edge of McMurdo Sound.

There, it is dissected and its blood syringed into a collection of vials. Its eyeballs, kidneys, liver and spleen are extracted and preserved in liquid nitrogen to await analysis. And finally, of course, from its muscular sides are carved giant white fillets, which go to the galley for dinner.

ADELIES

 
Of ice and Adelies By David Ainley Special to the Sun

Earlier this year, using annual counts of breeding pairs of Adelie penguins at capes Bird, Crozier and Royds, plus satellite imagery of the sea ice from 1973 to 1997, we discovered that the ice extent during winter in the Ross Sea has a major effect on Adelie penguin colony growth.

We found that a lot of ice that extends far north from the continent during winter leads to colony decline; but minimal ice extent leads to colony growth.

Adelie penguins that breed at sites on Ross Island spend winter near the pack-ice edge, wherever it may lie. There, daylight is sufficient for them to see and the ice pack is open enough to permit access to the ocean. We believe extensive ice may force the penguins to winter well beyond food-rich waters. In such conditions, young, inexperienced penguins apparently starve and, subsequently, their numbers are lost to the breeding population.

These findings explain about 30 percent of the annual variation in population size at capes Bird, Crozier and Royds. Thus, other factors are important, too. A major one, we believe, is “local” ice conditions in November when the penguins are arriving to breed, having trekked hundreds of kilometers from the pack-ice edge where they spent the winter.

What likely affects the ease of this journey is how large the Ross Sea polynya has been. The polynya is the area of open water that extends north from Ross Island during the spring, depending on how strongly the katabatic winds have been blowing. If the winds have been strong and persistent, open water is extensive and the penguins can swim much of their journey, at about 7-8 kilometers per hour. If they have to walk over the pack ice, at 1-2 kilometers per hour, it takes them much longer. The longer trip uses up more of their precious fat stores.

What does this mean? Basically, it means sea ice conditions are critical to the well-being of Adelie penguins. Indeed, Adelies don’t occur where there’s no sea ice, but neither do they occur where sea ice (especially fast ice, as in southern McMurdo Sound) persists for most of the summer. Ultimately, sea-ice conditions on a local scale may explain why there are 300,000 breeding penguins at Cape Crozierclosest to the polynyaand only 4,000 at Cape Royds, farthest from the polynya. In
between are colonies at Cape Bird and Beaufort Island, with about 80,000 breeding penguins each. But why has the colony at Royds increased in size 300 percent since the 1960s; that at Bird about 150 percent; and that at Crozier only slightly, if at all? Why has the large colony, seemingly, fallen out of favor?

To answer these questions, we are comparing the “quality of life” of penguins in a “big city” (Crozier) and a “small town” (Royds). We’re interested in gathering data both in summers with little sea ice (as in 1996-97 and 1997-98) and with a lot (as in last season and this one). We’ve developed a computerized scale that, before weighing a penguin as it walks across, identifies it by reading a bar code each penguin in our study-group wears. The penguin’s identity and weight are recorded
before it feeds its chicks, then after. The difference in weight is the amount of food delivered; the identity also tells us how often the chick was fed.

We also attach tiny radios to about 15 birds at each colony and then, using triangulation, determine how far from the colonies the birds are feeding (as a function of sea-ice conditions, of course). And, to another sample, we are attaching little computers that tell us how much of foraging trips are spent traveling versus diving (and the depth to which they dive, and how often). We also measure nesting success (number of chicks fledged per breeding pair) and the growth of chicks (how fat they get before heading off to sea on their own).

To gauge the effect of winter ice conditions, we band a sample of adults and chicks each season and then look for their returns the next. The proportion that return tells us the extent of over-winter mortality (and the satellite images tell us where the ice edge has been and where the penguins likely have wintered).

Where is all this leading? Basically, we believe that with warmer air temperatures, which have been documented around Ross Island over the past several decades, the patterns of sea ice have been changing in the Ross Sea. The ice may be less compacted and less extensive now than it was in the 1950s and 1960s. From what we observe, we can predict where the Ross Sea Adelie penguin colonies are headed, growth-wise.

David Ainley, of H.T. Harvey & Associates, is the principal investigator of the project entitled “Factors regulating population size and colony distribution of Adelie penguins in the Ross Sea.”

WASTE IN ANTARCTICA

 
Wasting away in Antarctica By Josh Landis Sun staff

There’s a paradox of human habitation in Antarctica: The continent that has the most brutal and forbidding environment on the planet also has one of the most fragile ecosystems. A footstep will remain visible in the Dry Valleys for decades. A seal population can be thrown off-kilter by the introduction of a simple, yet foreign, microorganism.

And the refuse of a human population that’s very small by U.S. standards can mar this beautiful land for centuries.

The evolution of waste management on Ross Island has gone from no concern for the environment in the early days of the explorers to U.S. Antarctic Program standards that are approaching zero-impact. Days of open-pit burning and open-water dumping are long gone. They’ve been replaced by a system that returns nearly four million pounds of waste to the States each year.

And much of it gets recycled.

For example: 3.9 million pounds of waste went north last year. 651,000 of it was wood; 650,000 pounds was construction debris; 494,000 pounds was food waste (400 pound average per person based on 1200 people!)

58% of all waste got recycled

Wednesday is America Recycles Day, but for Tom Vinson, manager of waste operations, it will be business as usual.

“Antarctica recycles every day,” he said. “It’s the best option we have.”

Recycling starts at the garbage cans, as anyone who’s been to McMurdo knows. Categories range from burnables to bio-waste, clothing to construction debris. There are 19 different varieties of solid waste here, and 18 categories of hazardous waste.

The most-recycled item by weight is heavy metal, adding up to 341,000 pounds last year. Light metal and paper products come next.

The National Science Foundation’s commitment to recycle materials such as solvents, paper and aluminum sometimes costs more than regular disposal.

“They’re commodities, and the price we get depends on what the market’s paying,” Vinson said. “It’s more of an environmental decision.”

Technically, recycling doesn’t occur here, but the sorting ensures that once the refuse returns to the States the process is easily handled.

Some methods of reusing waste, however, do take place at a local level. For example, furnaces that burn waste oil and fuel to create heat account for the disposal of almost a third of the hazardous waste stream – 341,000 pounds last season. The furnaces also conserve new fuel that would otherwise have to be used for the same purpose.

Not all burning efforts have been successful.

In the early 1990s the NSF built a multi-million dollar incinerator to dispose of some of its solid waste at McMurdo Station. Believing Antarctica did not fall under federal regulations that would cover such a facility in the U.S., the foundation didn’t prepare an environmental impact statement for the project. After losing a court battle with environmental groups, the NSF decided to abandon the incinerator approach and ship the waste home.

It was an event that probably increased the program’s recycling rate. Now waste such as paper and cardboard that might have been burned gets turned into post-consumer products.

As the largest presence on the continent, the U.S.’s evolving approach to waste is becoming a standard for other programs.

“Other nations are starting to look to us for guidance with their plans,” said Vinson.

The simplest Antarctic recycling method can’t be beat. It’s the “skua” system. No transport, processing, manufacturing or distribution is involved. Everything from clothing to chairs to televisions to teapots can be reused without having to go anywhere.

And the only hazard involved is looking out-of-style.

WOMEN IN ANTARCTICA

 
Women’s movement, Antarctica style; World-class expeditioner makes it to McMurdo By Beth Minneci Sun staff

It’s been eight years since Anne Dal Vera made history as part of the first group of women to ski from Antarctica’s edge to the South Pole.

The monumental, 678-mile journey, however, was only a piece of their original plan to cross the continent.

But after 67 days of skiing, upon reaching the Pole, the four women were weeks behind schedule and one was injured and ill. They decided to stop.

“It was sad,” Dal Vera said. “We had mixed feelings because we were very excited to get to the Pole, and that was a significant accomplishment. And yet, that wasn’t the dream that we had, so we hadn’t done what we set out to do.”

Today, Dal Vera, 47, is in her fifth year with the U.S. Antarctic Program. She’ll be here in February to greet former teammate Ann Bancroft, who is expected to start across Antarctica this summer, and hopefully complete the task she didn’t finish in 1992.

The trip this year is especially exciting to Dal Vera and Bancroft because Bancroft spearheaded the earlier effort and was most dissapointed by the decision not to continue.

“I think it was hardest for Ann to let go of the dream,” Dal Vera said.

Dal Vera and Bancroft met through mutual friends in the mid-1980s. Bancroft was already a polar pioneer, having been the first woman to reach the North Pole over land, in 1986.

The other two teammates were mountaineer Sue Giller and Sunniva Sorby, who came aboard only six months before the Antarctic adventure, which was dubbed the American Women’s Antarctic Expedition.

One of the largest hurdles before the trip was coming up with $1 million for transportation to and from the continent. The money was also for supplies and rescue staff in Antarctica and at training runs in Yellowstone National Park, Canada and Greenland.

When the women approached corporations for sponsorship, company after company turned them down.”I think that’s because there had not been an all-women’s expedition that was successful before us,” Dal Vera said. “Corporations were skeptical whether we could do it. We planned on making history.”

Incrementally, however, donations and profits from T-shirt sales, garage sales, small concerts and golf tournaments added up to more than half their expenses. The rest they paid for years after the trip.

“It was an extraordinary experience to have all these people give what they could,” she said. “Some would send us a letter with a $5 bill and say, “This is all I can give you, but I’m excited and wanted to help.'”

From St. Paul the women flew on an airplane to Punta Arenas, Chile, then to the Ronne Ice Shelf.

On Nov. 9, 1992, they shoved off the ice edge, each pulling 185-pound sleds toward the Pole.

In the next two months they faced 50-mph winds, put up with subzero temperatures, confronted frostbite, heat exhaustion and weight loss.

Moreover, they dealt with each other. On the Antarctic plateau there were no distractions, Dal Vera said. “So that means every single thing one person did was noticed or had an impact on the rest of us. It was probably the most intense situation I’ve ever been in.”

On Jan. 13, while approaching the Pole, the women calculated the miles left to McMurdo Station 882. At McMurdo, a private ship was scheduled to take them home on Feb. 15. They didn’t have enough time to get there on skis, they concluded.

“It was a tough call,” she said.

Hours after Dal Vera’s group reached the South Pole, two men who were also attempting to ski across the continent also arrived.

“They had lost about one-quarter of their body weight, and they looked very, very gaunt. They had frostbite and scars on their cheeks and their feet were all blistered.”

Still, the men went on.

“Ann went out to watch them go. She just stood there for a long time and watched them. You could tell that she really wanted to do it, but that wasn’t the year to go. Hopefully this year is.”

Dal Vera is not interested in trying to cross the continent again. The cost of the first trip was too burdensome. Upon returning to the United States, it was five years before the group’s $385,000 debt was paid.

But for Dal Vera, the Ice does have an affinity. In 1995 she started working with the Antarctic Program at McMurdo as a general assistant, returning for the next five austral summers. She has worked at the South Pole, and now works with waste management in McMurdo.

In the past she has taught cross-country skiing, worked with Outward Bound and as wilderness guide. But now, she’s happy to work and live here.

“I just had quite a strong bond with the land here and the ice, so I wanted to come back,” she said. “A lot of it has to do with the great people down here. They’re just adventurous souls.”

VOSTOK

 
Soaring below Vostok By Kristan Hutchison Sun staff

At first glance Lake Vostok is just flat and white, but Tom Richter had three weeks to look at it more closely.

He spent four hours a day flying back and forth over the frozen lake. The best views weren’t out the window of the Twin Otter plane, but in data from instruments that “see” through the ice sheet, measuring the depth and altitude of the ice, gravitational attraction, and magnetism of the earth.

“You could just look and see there was something interesting going on,” Richter said. “There’s rough, regular, rocky ground and then all of a sudden you could see some flat lake surface.”

Richter was at Vostok with the rest of the SOAR team, the Support Office for Aerogeophysical Research, to gather data for scientists trying to better understand the hidden lake, which is the size of Lake Ontario.

“Why the lake’s there nobody knows and that’s why we’re there,” Richter said. “I don’t know if we’re going to be able to find out either.”

Researcher Michael Studinger thinks he will find an answer in the 30 gigabytes of data SOAR collected in 36 flights.

“It’s the first detailed image of the lake itself,” Studinger said. “We are most interested in getting the geologic setting of the lake and also the depth of the lake.”

Every second the equipment recorded the gravitational attraction, six radar readings and 10 measures on the magnetometer. The altimeter gave the altitude of the ice to within 10 to 20 centimeters. Radar showed the terrain below the flat ice changed from rolling plains on one side of the lake to mountains on the other. The lake itself appeared to be in a basin, below two miles (three to four km.) of ice.

The findings will help scientists decide between two theories for the creation of the lake. One scenario is that the lake was created by erosion. The second possibility, and the one Studinger said preliminary data supports, is that changes in the earth’s crust formed the lake.

The evidence is a huge magnetic anomaly on the east coast of the lake’s shoreline. As the first SOAR flight crossed over to the lake’s east side, the magnetometer dial swung suddenly. The readings changed almost 1,000 nanotesla from the normal 60,000 nanoteslas around Vostok. A tesla is the standard measure of magnetism. Studinger typically finds anomalies of 500-to-600 nanotesla in places where volcanic material has poured out of the ground.

“When we first saw this huge magnetic anomaly, that was very exciting,” Studinger said.

Usually magnetic anomalies are much smaller and it takes some effort to distinguish the anomaly from normal daily changes in the magnetic field. In this case there was no confusion.

“This anomaly is so big that it can’t be caused by a daily change in the magnetic field,” Studinger said.

The anomaly was big in another way, encompassing the entire Southeast corner of the lake, about (65 b 46 miles) 105 km by 75 km. The size and extremity of the magnetic anomaly indicated the geological structure changes beneath the lake, and Studinger guessed it might be a region where the earth’s crust is thinner.

To create the type of topography found at Lake Vostok, the earth’s crust was probably stretched, thinning one to three percent as it pulled taut, Studinger said.

While the SOAR team flew, charting the lake from above, Studinger set up seismic stations to study the lake through the ground. He’ll learn more about the crustal structure under the lake from the way seismic waves travel from earthquakes around the world travel through the lake. In 22 days the sensors recorded eight earthquakes, including a 6.9 magnitude quake near Kodiak, Alaska.

Researchers are also interested in the interaction between the ice sheet and the water beneath. The ice sheet moves over the lake at about four meters a year. As it moves, it scrapes the ground and carries particles into the lake.

“That’s a way to get nutrients into the lake, which would be important for the ecosystem,” Studinger said.

Insulated beneath the ice, the water is warmed by the earth itself. The warm water at the bottom of the lake then rises and melts the bottom of the ice sheet in places, so small currents circulate through the lake.

“What we observe is there are regions where there’s melting going on and regions where there’s refreezing,” Studinger said.

But all these observations are done through the ice. Nobody has actually sampled the lake water itself yet, though Russian scientists have drilled to within a few hundred feet.

SOAR was really just scouting out the area for that next step, touching the water itself. Studinger and his colleagues at Lamont-Doherty Earth Observatory of Columbia University will spend the next two years analyzing the data SOAR collected and writing up the results. Once fully analyzed, the data will show where the sediments are in the lake bottom, how thick they are and where there are upwellings of water.

“One of the important things with this data is it will help to make a decision on a drilling location,” Studinger said.

SKUA BARN

 
Skua (the verb) By Kristan Hutchison Sabbatini Special to the Sun

When Janet Huddleston wants a new pair of shoes, she checks the trash. That’s where she found the bright red boots she wears with jeans and a lavender shirt.

“Everything I’m wearing is skua, except my underwear and my jewelry,” Huddleston said. “I do have limits. Underwear only in the package.”

Dumpster diving is a long tradition at McMurdo, going back before waste management set up separate “skua” bins for items that can be reused. Along the way the practice took on the name of the scavenging gull.

Here, there’s none of the stigma associated with Dumpster diving in the United States. Instead, people take pride in their ability to skua. Huddleston has a reputation as a skua fairy.

“People will come up to me with a wish list,” she said. “Within a week I’ll usually have it for them, because I’ll be looking for it.”

For herself, Huddleston mostly skuas clothes and stationary, though the dishes, humidifier, shelf, hooks and chair cover in her room were all skua items. Four of her ten pairs of shoes came from skua shopping, too.

At Skua Central, a 10 by 20 foot building where all the items are stored, a logbook reports the treasures people have found: shirts, tablecloths, pillows, wrapping paper, teddy bears, Christmas trees, spices, stereo speakers, maps, charts, bubble wrap.

“Last year it saved our lives,” said Bess Ward, a scientist working in the Dry Valley. Five people on her team forgot to bring towels, but found them at Skua Central.

“That was very, very useful to know about,” Ward said.

General assistant Lynn Keating also skuaed some necessary equipment – a sturdy pair of work boots.

“I’ve been looking ’cause the boots I brought were awful,” Keating said. “I kind of thought it was a hopeless effort. I couldn’t believe it, but they were my size.”

Solid waste supervisor Bill Poulson has seen working televisions, stereo systems and typewriters, but cheaper items are more common.

So are the seamy.

“Smut is very popular,” Poulson said. “We put out probably 300 magazines at Winfly.”

Waste management staff convinced the National Science Foundation to set aside building 122 for a free exchange of used items in 1995, Poulson said. The staff painted it a bright rainbow of purple, red, orange and yellow. Before that, waste management employees would just hold on to stuff that seemed too good to throw away.

They still do; the best things never make it to Skua Central.

Having first dibs on castaways is definitely a perk of a janitor’s job, said lead janitor Dee Miller.

She finds items before they’ve even reached the trash, abandoned in empty rooms by people who left the ice.”The best that I’ve found was a triple down white comforter for my bed, flannel sheets and a blow up air guitar,” she said

For non-janitors, the secret to skua hunting is to know when and where to look, and then to look often. Most of the best items are found at transition times, when seasonal workers are leaving and others are arriving. People on their way out of McMurdo pile things they don’t want in the dorm halls. That’s when Huddleston goes skua hunting every night, wandering through the dorms. By the time stuff gets to Skua Central, it’s been pretty picked over, Huddleston said.

Jess Barr, another scavenging pro, agrees that the key is to go “straight to the bins, because then nobody’s gone through it yet. There’s a whole chain of command on going through skua.”

For Barr, skua satisfies the urge to shop. At home she frequents second-hand clothing boutiques. Last summer she depended on skua to add glamour to the utilitarian wardrobe she’d packed.

“I just lived off it. I couldn’t even go near that building without coming out with a new wardrobe,” said Barr, a field coordinator. “It’s to fulfill the need for acquiring goods.”

Like Huddleston, Barr sometimes skuaed for others. When a friend needed running shoes, she was able to bring him six pairs.

That’s six pairs of shoes that might otherwise have been shipped to Washington, where the rest of the trash is disposed. Huddleston gets satisfaction from saving items from a wasteful demise. She even sends skuaed items home at the end of the season. Many people put things back in skua for the next person, though, recycling the stuff yet one more time. After traveling in third world countries and seeing how they reuse everything, even turning soda cans into toys, Huddleston’s
become more sensitive to the wastefulness of Americans and is even philosophical about her pastime.

“People throw things away, but when you think about it there is no ‘away’. It’s got to go somewhere,” she said.

WEDDELL SEAL

 
Beautiful and brutal The mysterious world of the Weddell seal By Josh Landis Sun staff

Turk’s Head is an eerie place. Even under the glare of a midday sun, the rocky outcrop on Ross Island sounds haunted. The moans and bleats of Weddell seals echo off the stone promontory as skuas hover menacingly overhead.Researcher Mike Cameron steps around a lounging female and her pup, looking for brightly colored plastic tags attached to their flippers. He’s checking every seal in sight. He and his teammates will get the ones that aren’t tagged twice.

“Here’s one,” Cameron calls out to Shawn Dahle. The two of them approach the animal, ready for a struggle.

“For an 800-pound carnivore, they’re amazingly docile,” he said.

But that doesn’t mean they’re non-resistant.

Tagging seals can be a difficult, smelly and even dangerous task. It involves one person throwing a hood over the animal’s head and jumping on its back to keep the hood in place while another tags each of the rear flippers. Each seal responds differently to the imposition. The more resistant ones can throw the scientists off several times before the job is done.

But the exercise is essential to a body of work that dates back to the early 1960s. That’s when research on the population of Weddell seals in the McMurdo Sound area began. Animals tagged then are still swimming these waters, teaching scientists more about these mysterious mammals each year.

Nobody knows, for example, exactly how long the seals live or how many reproductive cycles they can have. Some females that were tagged as pups in the early 1970s are still giving birth and show no signs of slowing with age.

The violent turf battles that take place between males underwater are also largely a mystery.

Researchers know the fights are brutal by the severity of scars and wounds they see on the seals, but can only imagine what takes place out of sight.

“There’s some conflict on the surface, but the vast majority takes place underwater,” said researcher Dan MacNulty. “The combat these males sustain is really remarkable.”

The outcome of fights like these determines the reproductive success of the Weddell males, which is also something that is little-known. In more than 30 years of research, only one picture has ever been taken of two Weddells breeding.

The research team at Big Razorback Island, working under veteran scientist Don Siniff, has been trying to change that.Inside an orange, sunbathed shack next to the snow-covered island, they monitor a television set connected to an underwater video camera. Kolene Krysl, a member of the Teachers Experiencing Antarctica program and research assistant, mans the camera with a small keyboard. She points it at a shaft of sunlight streaming through an open crack in the ice. Seals swim out of the inky darkness, bob to the surface and disappear out of view.

The camera is there to capture the underwater world most researchers rarely get to see, with a focus.”The idea is to study the interaction between males,” said Dan MacNulty. “These animals get beat to hell. They tear each other up. They’re vicious.”

The camera is the only way to get a good view of the fights, and learn more about the territorial ways of the Weddells.

“One of the big things we’re looking at is male-to-male interaction as the big ones come back to claim their territory,” said Krysl.

Most large mammals, such as bears, usually presage their confrontations with bluffs, and often avoid dangerous battle. Not the Weddells. The more researchers learn, the more they realize how violent these animals are.

An estimated 80 percent of the 1,400 Weddells in the study area are part of a continuous record. Each one’s age, sex, location and date of birth is recorded. By tagging newborn pups and recording which female they’re with, researchers can follow the maternity line back as many generations as are tagged.

“We can find a pup and tell you who it’s great, great grandmother was,” said Cameron.

Establishing which males become fathers isn’t so easy. Until recently, determining which male sired which female was impossible, since the breeding takes place underwater and the males aren’t involved with the rearing of their offspring.Modern technology is changing that. Now, all the adult males that turn up at Big Razorback Island are targeted for a new monitoring project: DNA testing. By taking tissue samples from the males and comparing them to tissue samples from pups,
scientists can determine which seals reproduce, and which ones get left out of the mating game.

They already suspect a smaller number of males do a larger portion of the breeding.

“Most males don’t get any females,” said Cameron. He estimates the ones that do get to reproduce could sire as many as seven offspring in one polygamous breeding season.

Also in the group’s arsenal of scientific equipment are cameras and sensors that Katsufumi Sato, a Japanese researcher working with the team, has been attaching to the backs of the seals. The instruments record the depth and direction of the seals’ dives as the cameras take hundreds of pictures, looking for more information on the underwater habits of the common, yet mysterious, Weddell seals.

ROCKS ON THE ICE

 
Searching the snows for space rocks; By Aaron Spitzer; The Antarctic Sun

With a glimmer of pride in his eye, researcher Ralph Harvey gently lifts the lid of a wooden box, revealing a fist-sized, fractured black stone. Harvey found the rock earlier this season in Antarctica, but it came from 200 million miles away.

The stone is a meteorite, which traveled to Earth from the vast asteroid belt between Mars and Jupiter. And Harvey, a geology professor at Case Western Reserve University in Cleveland, is a meteorite hunter.

Ever since he was a graduate student in 1987, Harvey has been coming south on what he calls an “Easter egg hunt” for space rocks. Now he’s the head of the project dubbed ANSMET, the Antarctic Search for Meteorites.

According to Harvey, Antarctica is the best spot on Earth to search for meteorites. More than 16,000 extraplanetary stones have been found here, including half of the Mars rocks ever discovered on Earth.

It’s not that more meteorites fall here than elsewhere. It’s just that in Antarctica, they’re easier to find.

On the Ice, there’s no soil or vegetation to hide space rocks, no running water to wear them down, a plain white background to see them against, and few other stones to confuse them with. In many areas of Antarctica, any rock in sight is a meteorite.

Of course, most meteorites that fall here become buried in snow, carried along by glaciers and, after eons, discharged amid icebergs in the sea. But in certain places, especially where the polar plateau meets the Transantarctics, ice flows into mountain cul-de-sacs and, unable to advance further, evaporates or blows away.

In these areas of “blue ice,” glaciers can be worn down by up to three inches a day. The meteorites are left behind and, over thousands of years, they start to pile up.

The researchers don’t have an elaborate system for determining where these pileups might be. Though they use satellite images to identify areas of blue ice, “It’s a rare blue-ice spot where the meteorites are actually concentrated,” Harvey said. “You’ve just got to go out and look for them.”

And that’s what ANSMET has been doing, for the last 23 years. The program started in 1976, shortly after a group of Japanese scientists happened upon a remarkable concentration of meteorites near Antarctica’s Yamato Mountains. Today, ANSMET is the best and cheapest source for scientists to acquire extraterrestrial material.

Hunting for meteorites in Antarctica is less romantic than it sounds. A group of Harvey’s researchers, currently conducting a transect search in the Foggy Bottom region of the Beardmore Glacier, has spent the last several weeks driving snow machines at a snail’s pace, back and forth in a parallel line, systematically sweeping the area.

Harvey likens the process to mowing a lawn, only with more overlap on each pass. Because of the comprehensiveness of the hunt, he said, “You end up with a really representative sample of what’s coming down to Earth.”

When a meteorite is spotted, it’s assigned an identification number and its location is recorded by GPS. Then it is placed in a sterile bag and kept frozen until it can be shipped to the Johnson Space Center in Houston, where all of ANSMET’s specimens are collected.

The Beardmore researchers have already found several hundred meteorites this seasonmost of them walnut-sized rocks called chondrites. According to Harvey, the stones are chemically comparable to the sun. They are leftovers from the time when the Earth and the other planets were formed.

Almost all meteorites found on Earth begin in the asteroid belt, where an enormous ring of dust and debris hangs in limbo, pulled in one direction by the Sun’s gravity and in the other by Jupiter, the solar system’s largest planet.

These opposing forces send the asteroids pin-balling into one another. Sometimes, one will ricochet out of the belt, hurtling on a trajectory toward Earth.

But not all meteorites come from the asteroid belt. According to Harvey, about one in 2,000 comes from elsewhere. At least six rocks found in Antarctica have been determined to have arrived from Mars, including one which excited a frenzy of scientific curiosity three years ago when it appeared to bear evidence of Martian life.

According to Harvey, it’s not surprising to find bits of other planets in the snows of Antarctica. “You’ve got this transfer of material between the planets going on at a fairly steady rate,” he explained. “I’m sure there are bits of Earth flying around in space.”

Another story about “rock collecting” in Antarctica

Antarctica is the place to find rocks from space By Beth Minneci Sun staff

Imagine living on Mars and one day picking up a meteorite that landed from Earth. Let’s think locally and say it was a rock from Mt. Erebus.

Having never been to Earth, one might judge the whole planet by that one rock. That would be in error, of course. The Earth is made up of lots of types of rocks with varied histories, not just Erebus rocks from Ross Island in Antarctica.

“The same applies to meteorites found on Earth,” said geologist John Schutt. “A lot of them are coming from different parent bodies with different histories.”

Now think about how an Erebus rock is rare and considered special. So are some meteorites. In fact, only 35 of thousands found on Earth so far are from the Moon or Mars.

The rest are mostly from what’s called the asteroid belt, a suspended ring of debris and partially-formed planets that knock about in space. The ratio makes lunar and Martian rocks treasured finds.

For five weeks this season Schutt and five others traversed over hundreds of miles of exposed blue ice. Their mission was to bring home lots of meteorites.

On snowmobiles about 100 feet apart they traveled in a series of parallel paths, scanning the ice while moving across it like a farmer plowing a field, back and forth, Schutt said.

“There’s some big country out there,” he said. “It requires a high level of concentration all day long.”

The group worked at Meteorite Hills, an area in the Transantarctic Mountains near the Darwin-Byrd Glacier named for numerous meteorites found there in 1978. All told 750 meteorites were taken this season, most of which are three to four centimeters in size.

“We pick up everything we find, including very small fragments,” said Schutt.

Anything bigger than fist-sized is considered a large sample. The largest that U.S. scientists have found was in 1976, at about 300 pounds. This was part of an 840-pound meteorite broken into 40 scattered pieces.

An initial inspection of this year’s catch revealed that nine meteorites appeared unusual. Further analysis at a lab in the States will tell more.

Though meteorites fall to Earth randomly, Antarctica is by far the best place to search for them, said Ben Bussey, who in December scouted new meteorite hunting fields with the meteorite project’s lead scientist, Ralph Harvey.

There are several reasons for this.

The likelihood of finding one here is enhanced by the continent’s white background. And the way glaciers move tends to concentrate meteorites on the surface at certain sites. Another is that meteorites found on ice sheets are less likely than those in temperate climates to be weathered away. And finally, in certain spots of Antarctica there is no other terrestrial debris with which to confuse an extraterrestrial rock.

Most of the group’s searching was on blue ice that has not been near any Earth rock, Bussey said. But some areas were dense with terrestrial rocks. One way to tell the difference between Earth and extraterrestrial rocks is by their exterior. Meteorites have what is called a fusion crust, a glassy surface that developed as the rock came through the atmosphere, heated up and melted.

“You develop a pretty good eye for them after a while,” said Schutt, who estimates that the team covered up to 1,200 miles on foot and snowmobile, and only examined one-third of the territory in Meteorite Hills.

All rocks flying through space are called meteors. They are usually made up of common rock forming minerals found on Earth.

When a meteor enters the atmosphere it glows and becomes a “shooting star.” Much of a shooting star evaporates before reaching the Earth or is crushed to dust by pressure before it hits the planet.

“I’ve heard it can be 20 tons of meteorites and cosmic dust a year drifting down into the atmosphere,” Schutt said. “It may even be more.”

Every meteorite on Earth is a messenger with information about the history of other planets, asteroids and Earth’s moon. Searching for meteorites on Earth is cheaper than, say, going to the moon or Mars to take samples. So each year researchers and volunteers scan Antarctic ice for meteorites, never knowing what might turn up.

Rare ones are prized, but even common extraterrestrial rocks are valued because they tell a more complete story about someplace in space.

The most abundant type of meteorite has chemistry that is similar to that of the sun. They are from the asteroid belt and are some of the solar system’s oldest objects. Scientists study them to understand the conditions present at the start of the solar system, which is believed to have been between 4.5 and 4.6 billion years ago.

One of the rarest and most famous was found by Crary Lab supervisor Robbie Score in 1984. Known as ALH84001, Score found it in the Allan Hills area north of the Dry Valleys. Scientists said the meteorite contained fossilized Martian life. But other scientists have argued that the meteorite was contaminated by its contact with Earth.

“It is still inconclusive,” said Schutt.

In Score’s office is a 23-pound iron meteorite, the heavies kind. It’s about the size of a super-ball.

Since 1976 the National Science Foundation has funded Harvey’s group in what is called the Antarctic Search for Meteorites program (ANSMET), which has collected specimens for study from many spots in the Transantarctic range. Including Japanese and European efforts, more than 20,000 have been recovered continent-wide.

The ANSMET group that hunts meteorites is actually part of a service from which scientists around the globe can borrow space rocks for research. Field party members examine the meteorites upon finding them in Antarctica, then send the rocks, still frozen, to the Antarctic Meteorite Curation Facility at the Johnson Space Center in Houston. At the center, the meteorites are freeze-dried to remove any snow and ice, then examined more. Findings are distributed to researchers around the world twice a year.

“It’s very exciting to be finding extraterrestrial material,” Schutt said, “especially if it turns out to be something unique.”

MT EREBUS

 
Erebus, A Volcano with Lots of Activity By Josh Landis Sun staff

When James Clark Ross sailed through the uncharted sea in 1841 that would later bear his name, he spied a tall, sloping mountain and called it Mt. Erebus. The smoldering peak must have made an impression, because he named it after the lead ship in his expedition. Little did he know that more than a century and a half later, the gold-spewing, bomb-throwing, shimmying and shaking mountain would be the focus of a different group of explorers.

In the world of volcano research, finding a cooperative subject is difficult. Active volcanoes can be inaccessible, temperamental, and even dangerous. Erebus is a rare find that’s well-suited to study. Its location 20 minutes from McMurdo Station is the least of its unique points.

“It’s a remarkable volcano,” said Philip Kyle, an ex-Kiwi who’s spent nearly three decades studying Erebus and now works through the New Mexico Institute of Mining and Technology. “The fact that it’s in Antarctica is a red herring.”

The most unique thing about it is the circulating lava lake in its crater.

“It’s one of the few volcanoes in the world that doesn’t plug itself up on a regular basis,” said fellow researcher Rick Aster.

Most volcanoes erupt, then cool, offering scientists little glimpse of their inner workings. Erebus has a natural convection that continually brings new lava to the surface. This steady circulation provides not only a fresh supply of magma, but allows gases to escape, another attribute of the volcano that makes it ideal to study.

The characteristics of the exhaust, or plume, can reveal a lot about what’s happening deep under the surface. Jean Wardell has been taking samples of the air over Erebus for several years, with a special focus on carbon dioxide.

Just like any liquid, magma is saturated with gases. Under the Earth’s crust, at great depth and pressure, those gases are forced into solution. When the magma makes its way to the surface, the gasses escape much like carbon dioxide bubbles out of a bottle of soda when it’s opened. Wardell is there to catch them.

“By examining the level of CO2 escaping, I’m hoping to get a better picture of the hydro-geological system of the volcano,” she said.

Erebus is perfectly situated to study trace gases in its plume because the air that streams past it is unpolluted. In areas closer to large populations, even the smallest amounts of pollution can throw off measurements.

Wardell attaches a tube to the tip of a helicopter’s antenna, and has the pilot fly a precise grid pattern through the plume. GPS units record the position every second, and at her lab she can create a detailed, three-dimensional plot of her findings.

Wardell also takes air samples inside the more dramatic formations of the volcano: the towering ice fumaroles that dot the terrain and the labyrinth of caves carved out under the snow. Escaping heat and gases create both, and they are as beautiful as they are scientifically compelling. There are even tiny particles of gold in Erebus’ exhaust, according to Aster.

In addition to gas measurements, Kyle’s team is mapping the surface of Erebus with high-precision GPS units. Each time the volcano erupts, the mountain shudders. To see it through the eyes of a seismometer is, apparently, quite fascinating and, again, quite rare.

“This is the only volcano in the world that has this level of resonance,” said Aster, referring to the subtle ways in which Erebus shimmies and shakes. One more piece of equipment rounds out the researcher’s view. A video camera peers from the crater rim.

The camera keeps a constant eye on the lava lake, recording dramatic splashes and eruptions 24 hours a day. A live link in Crary Lab allows scientists to watch the action and compare it to the readings on their seismometers. Microphones also help them distinguish between movement on the mountain and earthquakes in other parts of the world. The recent earthquake in El Salvador, for example, showed up on instruments here, but could be tuned out because its origin was known.

More extreme sampling methods include titanium instruments that are lowered from the active crater rim to measure the temperature of the lava, and “dog chain” sampling, where a chain is dropped into the lava and quickly pulled out with crystallized magma attached.

Common sense suggests that the gases spewing out the top of a volcano would be dangerous or even deadly, but Erebus’ plume is mostly just an irritant.

It’s about 95 percent water vapor, 4 to 5 percent carbon dioxide and less than one percent sulfur dioxide. That composition makes the plume noxious, but not life-threatening, which makes it possible for researchers to collect samples on the rim with little risk.

“Sometimes it gags us, makes us cough,” said Wardell.

An eruption on Erebus can be a small pop, or as loud as a thunderclap. Regular eruptions toss “bombs” out of the crater onto the rim. These light, glassy bombs of varying sizes contain another rare feature of the volcano, crystals.

These crystals take years to form inside the molten stew of Erebus and are ejected inside the bombs. Over time, the more brittle parts of the rock wear away and only the crystals remain. There is only one other place in the world where such crystals can be found: The volcanic system at Mount Kilimanjaro, in Tanzania, Africa. On Erebus, they are especially abundant.

“It’s just a gravel pit of crystals,” said Wardell.

Eruptions in 1974 got violent enough to scare scientists away from the top of Erebus for several months. Kyle said bombs as large as refrigerators were tossed hundreds of feet out of the crater and landed near the research hut.

“Things got pretty interesting for a while,” said Kyle.

But overall, the same qualities that make Erebus ideal for research keep it gentle enough not to pose a threat.

“As long as it’s convecting and degassing, it’s going to stay happy,” said Wardell.

“It’s the Old Faithful of volcanoes,” added Aster.

KATABATIC WINDS

 
Where the wind blows By Kristan Hutchison Sun Staff

Life at the very bottom of the ocean depends on the fierce winds blowing from some of the highest elevations of Antarctica.

Strong katabatic winds play a vital role in the creation of what is called Antarctic bottom water, cold dense water that slowly sinks to the depths of the ocean, bringing oxygen with it.

If you could dive to the seafloor anywhere in the world, from the Caribbean to the north Atlantic, you’d find water from the coast of Antarctica, said Gerd Wendler, a Fairbanks professor who studies the connection between the cold wind and the cold water.

“Seventy five percent of all the bottom water, wherever you are, comes from Antarctica,” Wendler said in his thick, German accent. “It’s a very small area of Antarctica and it’s directly connected with these katabatic winds and the sea ice.”

Wendler works with scientists from France and Australia to predict katabatic winds, particularly when the winds speed past 90 mph. This year he traveled to McMurdo Station on the Polar Sea icebreaker. As they cruised he measured the transfer of energy between the ocean and the air. The data will indicate how much katabatic winds cool the water.

But the process starts high above, around 10,000 feet higher, on the Antarctic Plateau. As air moves over the continent the layer nearest to the ice is chilled, creating a 10 to 20 degree difference in temperature between air traveling on top of it. The colder air descends to a lower elevation, the same way cold air drops to the floor in a warm room. Winds pulled downhill by gravity like this are called katabatic winds.

Since Antarctica is a smooth slope with no trees or mountains, the wind gains tremendous speed as it slides over more than 500 miles to the shore. Along the Adelie and George V coasts west of the Ross Sea the katabatic winds roar by at a mean speed of 60 mph.

The highest wind speeds ever recorded at sea level anywhere in the world were at Cape Denison in Adelie Land. Ninety years ago Sir Douglas Mawson landed there and dubbed the area “Home of the Blizzard” because the winds blew men off their feet. Peak gusts have been clocked moving faster than 100 mph.

Studying katabatic winds is difficult, not only because they are so strong, because the wind carries ice crystals from the high plateau to the sea. Wendler found that more than 10,000 ice particles per second pass through a square inch when the katabatic winds are very strong. Working at a camp on the ice, Wendler once had to string rope to guide him between the huts 100 ft. (30 meters) apart.

“It’s highly dangerous because you can lose your way,” Wendler said. “You always held on with one hand to the rope that you never want to lose.”

Most of the time Wendler and his co-researchers track the katabatic winds through a series of remote weather stations, ranging from Dome C at 10,000 feet elevation on the East Antarctic Ice Sheet to sea-level. They are particularly interested with what occurs when the roaring wind meets the frozen sea.

“These winds are so strong that they can drive the sea ice away from the coast any time of year,” Wendler said.

The wind pushes away the sea ice and cools the exposed ice until new ice forms. As new sea ice forms it leaves behind most of the salt, making the water below the ice the saltiest, densest in the ocean. The temperature is 31 F (-0.5C). Like cold air, dense water drops slowly down, sliding in 10 to 100 years the 2.5 miles (4 km) to the ocean bottom.

Called Antarctic Bottom Water, this cold water carries nutrients and oxygen with it, which supports sea life thousands of miles away, said Donal Manahan, who studies species living in the deep ocean.

“It pulls down nutrients down into the deep ocean and when those nutrients come to the surface again they stimulate plant growth,” Manahan said.

The movement of Antarctic bottom water is part of the system of global ocean currents, which transport water, heat and salt around the world.

“It’s very cold and very dense seawater that helps drive the ocean circulation by a ‘conveyor belt’ mechanism,” Manahan said.

Those currents impact weather patterns and climates, but the impacts go two ways. While bottom water influences the climate, changes in the climate can also influence the Antarctic katabatic winds that create bottom water. There is concern among some scientists that because polar regions are warming faster than the rest of the world, at a rate of 7F (4C) in the last century, Wendler said, the wind pattern will be altered.

In the end, the wind carries a simple lesson, Wendler said.

“Everything is interconnected.”

MOTION OF MASSIVE ANTARCTIC ICE BERG CAUSES ANOTHER IMMENSE BERG TO “CALVE”

 
The gyrations of an enormous iceberg that broke free of the Ross Ice Shelf in Antarctica last week appear to have loosened another large iceberg, and the “calving” of additional bergs may continue in coming weeks due to the ebb and flow of ocean tides.

Satellite images of the new berg indicate dimensions of about 130 kilometers (80 miles) by 20 kilometers (12 miles). The new berg is considerably smaller at 2480 square kilometers (960 square miles) than the piece of ice — now designated as iceberg B-15 — which broke off the Ross Ice Shelf earlier in March. Satellite images also indicate that the newest berg appears already to be breaking into several smaller pieces.

B-15 broke off the Ross Ice Shelf roughly 200 miles east of McMurdo Station, the largest of the National Science’s Foundation’s Antarctic Research Stations, and measured about 273 kilometers (170 miles) long by 40 kilometers (25 miles) wide. Its area of approximately 11,007 square kilometers (4,250 square miles) is roughly equivalent to the state of Connecticut’s.

NSF-supported researcher Douglas MacAyeal, of the University of Chicago, said that his models of iceberg behavior, based on the calving of previous large icebergs in other areas of Antarctica, led him to conclude correctly that B-15 was likely to collide repeatedly with the Ross Ice Shelf and cause other large bergs to split off.

“The tides are constantly trying to move a new iceberg in a circular orbit,” said MacAyeal. “The effect of that motion is that the iceberg that has just calved is like a bull in a china shop and that causes anything else that is ready to calve to come off too.”

MacAyeal said that tides and currents around Antarctica aren’t well understood, making it difficult to predict the fate of B-15 and the newer berg that it has spawned. But, he added, tidal motion may cause collisions that will calve other large bergs over the next several weeks before these two big icebergs begin to drift away from the Ross Ice Shelf.

“The appearance of this new iceberg confirms this dynamic,” he said, “The fact is that we could be in for more calving.”

Large icebergs, similar in size to B-15 have calved from the Ross Ice Shelf before, notably in 1956. But MacAyeal noted that today’s ability to watch the calving of these icebergs almost as it happens through satellite imagery is very exciting to scientists.

Matthew Lazarra, a researcher at the NSF-funded Antarctic Meteorological Center at the University of Wisconsin, first noticed the calving of the new iceberg while scanning satellite photographs of B-15 and a smaller fragment of that berg, dubbed B-16. Both B-15 and B-16 had been obscured by cloud cover for a period of several hours.

Lazarra said that the latest satellite images indicate that the newest berg already appears to have broken into as many as four smaller pieces.

NUCLEAR TESTING

 
Nuclear test ban sensors going online By Josh Landis Sun staff

On a quiet stretch of snow off the southern slope of Ross Island, engineers from the University of Alaska are setting up a device that will listen for explosions on the other side of the world.

With its tentacles of plastic tubing, the instrument looks like a space-age Hydra. But this super-sensitive creation will be the nemesis of anyone who tries to test a nuclear weapon. It’s an infrasound sensor, and it’s the newest addition to a global monitoring network aimed at keeping tabs on any new weapons of mass destruction.

The Comprehensive Test Ban Treaty Organization (CTBTO) is extending its reach onto the Ice by including Antarctica in its vast network of sensors. CTBTO is an international organization with the goal of monitoring, and eventually eliminating, the testing of all nuclear weapons.

Based in Vienna, the treaty has been signed by 160 countries since it came into existence in 1996. President Clinton signed it in ’96 but Congress has not yet approved it. So far, 30 of the 44 key countries that must ratify the treaty before it can enter into full force have done so.

Central in the effort to eliminate large-scale, nuclear weapons testing is the ability to detect explosions wherever they may happen. To this end, CTBTO monitors hundreds of sensors around the world.

In all, there are 170 seismometers to measure subsurface explosions, 80 radionuclide detectors to sniff minute amounts of fallout in the air, 11 hydroacoustic units that can detect underwater blasts, and 60 infrasound sensors able to sense subtle pressure waves that result from explosions on or near the surface of the Earth.

Until recently, the network was lacking in the southernmost reaches.

“Antarctica was a big hole in the global coverage,” said Brian Stone, National Science Foundation representative and CTBTO program manager. “So having (monitoring) stations here is advantageous.”

Dan Osborne heads the University of Alaska team that’s installing the new infrasound detector at Windless Bight. Hurrying around his makeshift office in Bldg. 165, the bearded, brown-haired, bespectacled engineer spliced various computer wires to get his laptop to communicate with a sensor on the floor.

Jagged lines leapt across the screen each time a door somewhere in the building was opened.

“It’s just like a barometer,” explained Osborne. “It reacts to changes in atmospheric pressure.”

The array of infrasound detectors on the ice shelf just off Ross Island will be able to sense a one-kiloton blast that goes off above-ground or just under the surface. Osborne said the technology is so sensitive that when Mount St. Helens erupted in Washington in 1980, similar sensors here on the Ice detected the blast each time its shock wave encircled the Earth. After a while, he lost count.

It’s that kind of sensitivity the CTBTO relies upon. In addition to the infrasound station at Windless Bight, there is one at Palmer Station. Traditional seismometers will be listening to the ground at the Dry Valleys, South Pole and Palmer, where a radionuclide detector will also be on line.

The CTBTO had to make some concessions when installing a device in Antarctica. For starters, sensors on the network are normally required to have a near-perfect performance record. The “up-time requirements” only allow a sensor to be off-line for about three days a year. There is no way to guarantee that kind of reliability in Antarctica. If the system would go down in the middle of the winter, for example, it could potentially take more than a day just for someone to go check it out.

It’s not the ideal scenario for CTBTO, but Stone says the organization will mostly likely accept the Antarctic standards, because that’s the only way they will get the data.

“There was nobody in that group who had experience in Antarctica,” said Stone. “They wanted to make it happen, but there was a lot of reality-checking. The specifications for station up-time were not written with Antarctica in mind.”

The organization also had to allow someone else to transmit the data from the sensor site. Normally the link goes through a satellite uplink CTBTO supplies. That wasn’t feasible here, so they agreed to let Raytheon carry the data back to the States, where it will be redistributed to the rest of the world.

“We convinced them it’s better to consolidate things in Denver,” said Mitch Lasky, Raytheon point-of-contact for the project.

The sensors are all now either in the installation or testing phase. If they pass muster they will be officially incorporated into the CTBTO monitoring network. It’s an ideal scenario and fits well with the overriding philosophy of science in Antarctica: share the data. CTBTO is conveniently, and efficiently, co-opting the same instruments that would be used for scientific purposes.

Still, monitoring nuclear weapons testing around the world from Antarctica is an odd twist on the continent’s position as an area of peaceful, scientific pursuit. Antarctica has drawn researchers and explorers from the most powerful countries in the world.

“Now the science really is being used for a peaceful purpose,” said Osborne. “It’s a perfect fit.”

UNIVERSE EXPLORATION

 

On the cusp By Beth Minneci Sun staff

For decades astronomers struggled to prove the geometry of the universe. So when images captured from a balloon over Antarctica last year confirmed that the cosmos was flat, the news provided splashy headlines around the world.

In the United States, “Science Snags Front-Row Seat to Infant Universe,” read The Washington Post. “Baby pictures of universe show it’s flat,” said the Baltimore Sun.

“Just last year there was no consensus with geometry of the universe,” said astronomer Erik Leitch. “Now we know with good certainty that it is flat.”

The balloon project, called BOOMERanG, was the first experiment to provide evidence of the universe’s geometry with high-resolution maps of the big bang’s afterglow. The radiation is called the cosmic microwave background, and it is the closest astronomers have come to a visual image of cosmic history.

Technological developments in the last few years indicate that history and news will be made again, soon.

The cosmic microwave background is radiation that scientists use to trace the universe’s history to 300,000 years after the big bang, which is believed to have happened 15 billion years ago. Just after the big bang, particles in the universe were scattered through the cosmos like snow in a blizzard that light could not penetrate. But about 300,000 years later, scientists believe, the universe cooled. Its particles had altered to a state that allowed light, or radiation, to pass between them. The particles left an imprint on the radiation that scientists are able to detect in finer detail than ever before.

“It’s like a fossil of an earlier universe,” said Leitch, who works with the South Pole station radiation telescope project Degree Angular Scale Interferometer, or DASI. “It’s the oldest fossil around.”

The cosmic microwave background’s potential as a learning tool is far-reaching for astronomers seeking answers to fundamental questions: Is the universe expanding? If so, how fast? What is it made of? And most recently, is the universe’s geometry flat, in which two parallel lines will never meet? Or does it curve in on itself like a sphere, or expand outward, like a saddle?

Since the 1960s scientists have known that the cosmic microwave background existed.

In 1991 they were first able to see temperature fluctuations in it. They say this is key because the distribution and sizes of hot and cold spots tell of the early universe’s density of matter. Their new telescopes make maps that show the variations. As astronomer Kim Coble put it: “The distribution of the spot sizes tells you everything you want to know about the universe.”

As evidenced by the balloon’s message, prodding past our galaxy into the microwave background is a way to churn out relatively quick answers to long-standing questions about the universe’s origin and fate.

But there is a side effect.

The more precise technology has fueled a race among academics to make the most efficient telescopes and radio receivers and to come up with earth-shattering conclusions. The scientists are exhilarated to quickly synthesize their data and publish their findings. But they’re also feeling pressure from the scientific community to rush to conclusions.

“We are working on questions that are so fundamental they really want to know the answers,” Leitch said. “They’re just beating down your door.”

Impressions from the cosmic microwave background are widely accepted as reliable paths for tracing cosmic history. But astronomer John Ruhl takes the race in stride: “If you look at the history of science, there’s always people on the forefront of knowledge, and there are times when the rate of knowledge accelerates until a standard is turned over. This is a fantastic time to be doing cosmic background work. The 1970s weren’t.”

In Europe and Russia scientists are pursing the answers to astrophysical questions via the cosmic microwave background.

In Antarctica, at the South Pole, new multi-million dollar telescopes and radio frequency receivers are cropping up.

The DASI project is actually 13 telescopes aimed to detect temperature fluctuations in the early universe. DASI is designed to record high-resolution images of the cosmic microwave background.

A NASA satellite MAP, Microwave Anisotropy Probe, is scheduled to be deployed this year. The long duration balloon TOPHAT launched from Williams Field early in January circled Antarctica recording radiation and recently returned home.

At the South Pole this season, a high-frequency radio receiver was deployed with the Viper telescope. Ruhl and Coble work on the receiver, called ACBAR, an acronym for Arcminute Cosmology Bolometer Array Receiver, which extends Viper’s observations to higher frequencies.Together the telescopes, balloons and satellite are hunting for answers to the origin and fate of the universe.

“We’ll have answers to the big questions in, I would say, five years,” Leitch said.

But Ruhl is more cautious: “I’m more of a wait-and-see type.”

VOSTOK

 
Vostok: A search starts for other life By Teri McLain Special to the Sun

On Europa, one of Jupiter’s frozen moons, a thin skin of ice hides what may be a liquid sea. If so, it would be the only known place in the solar system besides Earth where water exists in significant quantities. It is there scientists believe we might discover our first aliens a nation of microbes.

But the training ground for this interplanetary exploration is Vostok in Antarctica.

Engineers from NASA, Woods Hole Oceanographic Institution and the University of Nebraska are designing a pair of robots to penetrate the sea ice of Europa and sample the putative ocean. The cryobot, a device that melts a route through the ice, and the hydrobot, a small submarine that explores the sea below, may see real action for the first time in Earth’s largest known subglacial body of water: Lake Vostok.

Just one of almost 80 known lakes beneath Antarctic ice sheets, Lake Vostok has recently captured the attention of glaciologists and microbiologists alike. A pristine body of water cut off from the outside world for a million years or more, the lake has the potential for supporting previously undiscovered microbial life forms, as well as holding clues to ancient climates. It is a time capsule of sorts, buried under four kilometers of ice.

When the Russians opened Vostok Station near the geomagnetic pole in 1957, they had no idea that it was situated over an ancient body of water more than 1,640 feet (500 m) deep and 243 miles (230 km) long. And when they started drilling the world’s deepest ice core in an attempt to understand recent global warming in relation to the climactic cycles of the last 500,000 years, they would not have predicted that they would be stopped at 11,886 feet (3,623 m) by a group of scientists
concerned with contamination of the lake’s pure water.

This season, the National Science Foundation is setting up a camp near the Russian station to explore subsurface features of the lake.

Although early seismic surveys in the 1960’s and 70’s indicated that water might exist under the ice cap, it wasn’t until drilling was well under way in the early 1990s that satellite, seismic, and airborne radar data were put together to map the buried lake. “It was a ‘Eureka!’ moment,” said Martin Seigert, a University of Bristol glaciologist.

In 1995, the Scientific Committee on Antarctic Research recommended that drilling be stopped 400 feet from the lake’s surface, until a sterile method could be found to tap into one of the oldest ecosystems on earth. Last year, microbiologist John Priscu of Montana State University examined bits of ice from the deepest part of the core and found bacteria.

It is still unclear whether these microbes were deposited by ancient winds, or if they are indicative of bacteria living in the lake below. But it is tantalizing to astrobiologists, who speculate that if life can exist in Lake Vostok, it may also be present on Europa.

A multinational team of scientists and funding agencies is assembling to devise a method for drilling into Lake Vostok without contaminating it with drilling fluids or foreign bacteria. The first step will commence this week with test flights of the SOAR Twin Otter. Equipped with instruments for an aerogeophysical survey, the team plans to conduct 69 flights this season and produce a data set that will aid scientists in understanding the lake’s physical properties and geologic origins.

The next phase could involve NASA tests of the robots. The cryobot would melt its way down to the lake where it would eject the hydrobot to explore the depths and send back pictures and data to the surface via a cable. The final stage would involve deep coring to retrieve sediment and water samples. The details of probing the lake without introducing contaminants are still being worked out.

It is a complex and ambitious effort that with the help of NASA technology will potentially answer some fundamental questions about the evolution of life here on Earth. And by giving scientists a testing ground for the cryobot and the hydrobot, something may someday be discovered about the evolution of life on other planets.

Penguin Plight

 
Nature vs. nature: The plight of the penguin By Melanie Conner Sun staff

Mother Nature gave desperate Ross Island penguin colonies a small break in the form of a four-day, blasting windstorm last month.

In mid-December, strong katabatic winds altered the fate of the penguin colonies when they swept the winter’s accumulated ice out to sea and provided the birds with access to their summer breeding grounds. The event was key to the survival of some Ross Island penguin colonies, reported scientist David Ainley, of H.T. Harvey & Associates, ecological consultants based in San Jose, Calif. Before the storm, it was predicted that some colonies would not survive at all.

“Cape Royds colony is going to fail,” said Ainley, in an interview in early December before the storm. “If the ice remains, it will disappear as a penguin colony.”

Troubled penguins of the Ross Sea made headline news around the U.S. last week when the National Science Foundation released results of studies in conjunction with satellite images from NASA that show iceberg movements. The NSF reported one penguin colony – Cape Royds – was “in danger of extinction” while others would experience a “significant reduction” because of abnormally extensive sea ice and the movement of massive icebergs, one the size of Delaware.

“Enormous Icebergs Imperil Penguins,” read one headline from the Los Angeles Times last week, where it was reported the two icebergs that broke off in March of 2000, combined with sea ice, have “choked” some coastal areas.

This year emperor and Adelie penguins have had difficulty traveling to and from their breeding grounds, usually located at the sea’s edge, because of ice conditions in the Ross Sea. According to Ainley the birds’ normal walking speed is 0.5 miles per hour, while their swimming speed averages 4 to 5 miles per hour.

Long, difficult over-ice journeys discouraged penguins from breeding this year. Usually, the birds migrate inland to their breeding grounds from the pack ice in the eastern Ross Sea, where the female penguin lays eggs in pebble-lined nests, then travels to the sea for food while her mate incubates them. This year, the foraging parent has often returned too late, if at all, causing the incubating birds to abandon the eggs in search of food.

“Males take the first turn on the eggs, for about 12 days,” said Ainley. “But now males sit and wait but the females don’t return.”

Their fate seemed a cruel act by Mother Nature until the mid-December storm originating on the polar plateau, blew 20 miles (32k) of ice out to sea and cleared the way for penguins. Ainley’s team and other scientists were studying the birds at Cape Crozier, Cape Bird and Cape Royds when the storm hit and they witnessed the immediate effects of the removed sea ice.

“When we ventured forth, we found that the colony population had tripled and more penguins continued to stream in,” wrote Ainley in an e-mail. “It appears that the big wind expanded the Ross Sea polynya sufficiently enough to encourage all these birds to show up.”

The storm could have saved the colonies had it not arrived two months too late. The four-day storm that should have occurred during the early austral spring hit Ross Island one week before summer solstice on Dec. 14.

What is left of theAntarctic summer is not long enough to raise chicks before winter arrives.

“If they don’t lay eggs by Nov. 20, it’s too late,” said Ainley.

For the penguins, Mother Nature is fickle. In many ways, the timing of the storm couldn’t have been worse, as it occurred during the peak-hatching season. The winds carried away more than sea ice – it also stole eggs and chicks.

“Apparently, whenever a parent rose to switch position or give over nest duty to its partner the eggs or hatchlings departed, swept away by the wind,” wrote Ainley.

About 500 adults were blown down the hillside and killed at the Cape Crozier Adelie colony. Hundreds of remaining penguins were buried in snowdrifts 5 to 15 feet (1.6 to 4.9 m) deep.

“A bunch wiggled their way to the surface, but likely hundreds are still buried,” wrote Ainley.

After the storm only 2 percent of the Adelie breeding population at Cape Crozier, the sixth largest Adelie colony in the world, has chicks.

Beforehand,emperor penguins at Cape Crozier failed to produce chicks, according to Gerald Kooyman of Scripps Institution of Oceanography. The problem with the emperor colony is that the largest iceberg (called B15 based on the location from which it broke) may have bumped up against Cape Crozier during the winter, which is when they lay eggs and incubate.

“It is unclear as to the timing of the iceberg’s movement in relation to the coming and going of emperors during the winter,” said Paul Ponganis of the University of California in San Diego.

“But the end result was that we could not find any live emperor chicks at the usual Cape Crozier emperor colony location.”

The exact fate of the birds remains a puzzle.

“We do not know if most of the emperors abandoned the site and left, if they were trapped there and died, or if they may have moved to another site,” Ponganis said.

On the other side of Ross Island, before the four-day, mid-December storm, the Adelie penguin colony at Cape Royds and the southernmost Adelie penguin colony in the world was headed for extinction. The outlook remains grim. While the storm blew out 30 to 75 km (18 to 45 miles) of ice, the population increased only slightly. The birds’ journey has been shortened from a 120-km (72-mile) round-trip walk to a 60-km (36-mile) round-trip walk – still too far for an over-ice journey. If the sea ice can break up more the colony will be fine, Ainley said.

Just north of Cape Royds the wind worked miracles for the Cape Bird colony that was expected to suffer the same fate as its neighbor to the south. However, Cape Bird is located slightly farther north and closer to open water than Cape Royds. “It now takes a day for the penguins to go out and back,” said Ainley. “That’s their ‘normal’ feeding trip duration.”

According to Ainley, about 30 percent of the Cape Bird breeding population has chicks, compared with 2 percent at other colonies.

The ice as a culprit

Just as penguins are a part of Antarctic ecology, so are ice movement and the constant calving of icebergs. The irony is that penguins need coastline and shores upon which they can breed; yet this terrain is provided by the retreat of ice shelf through the calving of bergs. Colonies around Ross Island are very vulnerable to ice calving and they are now living through the effects of a giant iceberg that calved-off almost two years ago.

The trouble began for the penguins in March of 2000, when the B15 iceberg broke away from the Ross Ice Shelf and eventually migrated toward Cape Crozier on the east side of Ross Island. The iceberg measures 100 miles long (160k), 22 to 32 miles wide (33-50 miles), 150 feet (46m) above water and 800 feet (246m) deep. The berg has split in two, shifted, drifted, pivoted and cracked in the last two years, and harbors the potential to block sea access to McMurdo Station.

On the west side of the island, the effects of accumulated sea further increased the isolation of the island. This year, for the second consecutive season, the sea ice in the McMurdo Sound did not break up as it usually does in the late austral spring. Usually, strong, southerly winds send newly-formed sea ice on its way and out of the area. Researchers say that perhaps the absence of the wind this year prevented the sea ice and from escaping McMurdo Sound. Others are exploring the possibility that persistence of the sea ice is caused by the B15 iceberg.

“There is also some argument now as to whether the sea ice is caused by B15a or that the fact that B15a didn’t get blown away last winter is due to an unusually windless winter that also caused the sea ice,” wrote Doug MacAyeal of the University of Chicago, in an e-mail.

Along with the annual breakup of the sea ice comes the U.S. Coast Guard vessel, the Polar Star, an icebreaker used to cut a channel through remaining ice to allow safe passage of re-supply ships.

However, this year the NSF has contracted two icebreakers to clear a path in the extra-thick ice.

The breakers helped the Cape Royds birds by collapsing the integrity of the ice, which created enough cracks to allow open water to reach the colony when strong winds blew the ice out on Wednesday and Thursday.

“The breaker cuts a swath down the middle about 100 yards wide,” said Ainley. “The ice becomes two big ice sheets that can break apart.

Meanwhile, researchers at Cape Bird and Crozier will use radio telemetry to track the birds and find out where penguins are feeding. They will track their progress in the coming years and study as much of the penguin colonies as possible.

According to the NSF, “The penguins response to the icebergs likely will provide major new insights into the biology, resolve and resilience of this species.”
 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s