Morning photo: Horizons

Ever onward …

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The horizon over Dillon Reservoir is sandwiched by clouds.

FRISCO — Most of us know how important it can be to have strong lines in an image to help guide the eye toward the subject. But often, the most common line — the horizon — is the focal point of an image. Our eyes are automatically drawn toward that distant threshold, beyond which is, well, the rest of the world. Horizons in the theme of this week’s #FriFotos Twitter chat, with wonderful images streaming in from all corners of the globe. Join the fun by uploading your own pics and tagging them with #FriFotos.

Sunlit icebergs gleam on the horizon in the Antarctic Sound.

Distant icebergs float on the horizon in the Antarctic Sound.

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Antarctic clams may take a hit from global warming

Study shows climate change may affect overall population numbers

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Changes in Antarctic clam populations could have a ripple effect on other species in the region like these blue-eyed cormorants in the South Shetlands. Bob Berwyn photo.

By Summit Voice

FRISCO — Warming ocean temperatures and increased glacial outflow around Antarctica may have a big impact on clams living on the ocean floor. Younger clams try to move away when they sense warmer temperature or reduced oxygen levels, but older clams stay put.

The findings by a team of British and German scientists indicate how climate change may affect biodiversity in the region, suggesting that the overall population of Antarctic clams may dwindle, since it’s the older animals that reproduce.

“Our study shows that the physiological flexibility of young clams diminishes as they get older. However, the species has evolved in such a way that the fittest animals, that can tolerate life in an extreme environment, survive to reproduce into old age,” said Doris Abele, of the Alfred Wegener Institute in Germany. “Climatic change, affecting primarily the older clams, may interfere with this evolutionary strategy, with unpredictable consequences for ecosystems all around Antarctica.” (more…)

Climate: Does El Niño drive West Antarctic warming?

Ice cores suggest current climate is in the natural range of variability

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Climate scientists track Antarctic changes, Bob Berwyn photo.

By Summit Voice

FRISCO — Ice cores from West Antarctica spanning the last 2,000 years suggest that recent warming and glacier loss in the region is comparable to other warm periods during that span.

Most of the recent warming may be related to powerful El Niño phases in the tropical Pacific in the 1990s, said University of Washington researcher Eric Steig. The ice core record shows similar temperature spikes in the 1830s and 1940s, he said, adding that the recent warming  cannot be attributed with confidence to human-caused global warming.

Steig built on previous research showing that rapid thinning of Antarctic glaciers was accompanied by rapid warming and changes in atmospheric circulation near the coast. The new study suggests that the 1990s were not all that different from some of those earlier warm spells. (more…)

Climate: Antarctica surface melting speeds up

Ice core study shows rapid pace of change along Antarctic Peninsula

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Warmer summer temperatures along the Antarctic Peninsula are starting to take a toll on ice and snow in the region. Bob Berwyn photo. (Dundee Island).

By Bob Berwyn

FRISCO — Careful study of a 1,200-foot long ice core sample spanning 1,000 years suggests that summer ice melt in parts of the Antarctic Peninsula region has intensified almost tenfold. About 5 percent of the annual snowfall has been melting in recent years, compared with only about 0.5 percent during the coolest phase (about 600 years ago) of that 1,000-year span.

“This is the first time it has been demonstrated that levels of ice melt on the Antarctic Peninsula have been particularly sensitive to increasing temperature during the 20th Century,” said Dr. Nerilie Abram, a climate researcher at Australian National University who studied the ice core from James Ross Island.

Most of the increased melting occurred during the past half-century, corresponding with the era of increasing greenhouse gas emissions and a remarkable warmup around the peninsula and some other parts of Antarctica. Borehole temperature estimates from the West Antarctic Ice Sheet also indicate rapid acceleration of West Antarctic warming during the past two decades. (more…)

Climate: Some penguins expanding range as ice melts

Adélie penguins breed in ice-free areas

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An Adélie penguin on Paulet Island. Bob Berwyn photo.

By Summit Voice

FRISCO — While populations of ice-loving chinstrap and emperor penguins in Antarctica may be squeezed by global warming, Adélie penguins may actually benefit from warmer  temperatures, according to University of Minnesota Polar Geospatial Center researchers.

Scientists from the United States and New Zealand studied a combination of aerial photography beginning in 1958 and modern satellite imagery from the 2000s, finding that the population size of an Adélie penguin colony on Antarctica’s Beaufort Island near the southern Ross Sea increased 84 percent (from 35,000 breeding pairs to 64,000 breeding pairs) as the ice fields retreated between 1958-2010. The biggest changes came in the last three decades, as average summer temperature in that area increased about .5 degrees Celsius.

The study showed that available habitat for Adélie penguins on the main portion of the Beaufort colony, on the south coast, increased 71 percent since 1958, with a 20 percent increase from 1983-2010. The extent of the snow and ice field to the north of the main colony did not change from 1958-1983, but then retreated 543 meters from 1983-2010. (more…)

Changes considered for U.S. Antarctic research program

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South Shetland Islands, Antarctic Peninsula. Bob Berwyn photo.

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U.S. Antarctic research program to upgrade logistical operations in cost-savings push.

Costs of aging infrastructure, outdated management procedures cut into science funding

By Summit Voice

SUMMIT COUNTY — Federal science officials say they’ve outlined a plan for streamlining U.S. research efforts in Antarctica, including the use of robotics for some logistical tasks, as well as additional use of renewable sources for some energy needs at the three research bases.

The 2012 budget included about $350 million dollars for invaluable climate and atmospheric research that can’t really be done anywhere else. About 3,500 people (including logistical support roles) work with the Antarctic program each year, supporting about 800 scientists working to understand the Antarctic and its associated ecosystems and  to understand the region’s effects on, and responses to, global processes such as climate.

The U.S. maintains three Antarctic research bases: McMurdo Station, on the Ross Sea, which is the largest facility and acts as a gateway for most of the research activity; Amundsen-Scott South Pole Station, focusing primarily on astronomy and astrophysics, and Palmer Station, in the Antarctic Peninsula region, where the emphasis is on marine biology, oceanography, and geophysics.

This past week, the National Science Foundation responded to the findings of a special panel convened to look for ways to operate the Antarctic Research Program more efficiently. The NSF acknowledged the issues raised by the panel and said it has already started working on implementing some of the recommendations.

The Blue Ribbon Panel report, released in July 2012, found that, “U.S. activities in Antarctica are very well managed but suffer from an aging infrastructure, lack of a capital budget, and the effects of operating in an extremely unforgiving environment.”

The panel concluded that the lack of a capital budget is the main challenge, and that making changes to the logistics support system would help realize long-term savings, but will require front-end investments that could be supported with additional funding, temporary reductions in research, or both.

The panel spelled out a laundry list of problems, including: “A warehouse where some areas are avoided because the forklifts fall through the floor; kitchens with no grease traps; outdoor storage of supplies that can only be found by digging through deep piles of snow; gaps so large under doors that the wind blows snow into the buildings; late 1950s International Geophysical Year- era vehicles; antiquated communications; an almost total absence of modern inventory management systems (including the use of bar codes in many cases); indoor storage inefficiently dispersed in more than 20 buildings at McMurdo Station; some 350,000 pounds of scrap lumber awaiting return to the U.S. for disposal.

“The status quo is simply not an option; sooner or later the atrophying logistics infrastructure will need to be upgraded or replaced. Failure to do so will simply increase logistics costs until they altogether squeeze out funding for science. A ten percent increase in the cost of logistics will consume 40 percent of the remaining science budget,” the panel found.

Morning photo: Bergs!

Otherworldly …

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Iceberg silhouettes at dawn.

FRISCO — It’s been a while since I delved this deep into the archives, but as I scrolled through the Antarctica folder, I realized that I’ve only posted a small percentage of all the iceberg pictures I shot during our trip to the Antarctic Peninsula four years ago. Since then, I’ve scribbled dozens of stories about the impacts of global warming in the region, and each time I write and post one of those, I think about the hours we spent floating in this otherworldly realm. There so much at stake for this region — temperatures around the Antarctic Peninsula are warming twice as fast as the global average, ice shelves are collapsing and warming ocean temps are threatening to push some ecosystems over the brink. Please browse through some of the recent Summit Voice stories on Antarctica and share them on your own social media networks to spread the word. (more…)

Climate: New study maps regional sea level rise variation

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A new study coordinated by the EU’s ice2sea program helps identify which parts of the world will be most affected by sea level rise in the coming decades.

Tropical Pacific to see the greatest increases, while relative sea level is likely to drop in some polar regions

By Summit Voice

FRISCO — Intensifying concerns about the potential for sea level rise to swamp low-lying Pacific island nations are justified, according to a new report in the Geophysical Research Letters journal. Western Australia, Oceania and the small atolls and islands in this region, including Hawaii, are at greatest risk, according to the new study from EU’s ice2sea program.

The results of the modeling mirror observational data that’s been collected by satellites in the past few decades, said David Vaughan, program coordinator for EU’s ice2sea program, which seeks to develop more accurate sea level rise predictions. (more…)

Antarctica: Disturbing signs of human impacts

Study scrutinizes Fildes Peninsula, on King George Island

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Parts of the greater Antarctic ecoregion may not be as pristine as they should.

By Summit Voice

SUMMIT COUNTY — A high concentration of research stations and the associated intense human activity is compromising the integrity ecosystems on parts of South Georgia island, according to a team of German researchers who have been gathering data in the area for several decades.

Along with land-based impacts like tire tracks and discarded industrial waste, leakage from port facilities and ships is also affecting marine ecosystems, said University of Jena professor Dr. Hans-Ulrich Peter, head author of a report authored for the German federal environmental agency.

The report recommends designating the Fildes Peninsula, part of King George Island, as a formally managed area under the Antarctic Treaty, which would include legally binding standards for the use of the region. The proposed measure could reduce the conflicting interests between science, tourism and the protection of geological and historical sites as well as keeping its environment intact. (more…)

Record-breaking NASA balloon flight over Antarctica gathering data on high energy cosmic rays

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Giant balloon has circumnavigated Antarctica three times

By Summit Voice

FRISCO — Somewhere out in deep space, an as-yet unknown source is producing high-energy cosmic rays that bombard the Earth on a regular basis. After gathering data from a record-setting unmanned balloon flight over Antarctica, NASA scientists hope to  better understand where these energetic atomic nuclei are produced and how they achieve their very high energies.

The record-breaking balloon carried an instrument with a name that’s straight out of science fiction comic book, the Super Trans-Iron Galactic Element Recorder. So far, the balloon has been aloft for 46 days. Taking advantage of the unbroken circumpolar winds, the balloon is on its third orbit around the South Pole.

You can track the balloon on its flight by visiting this page: http://www.csbf.nasa.gov/antarctica/ice.htm and learn more about NASA’s balloon programs here: http://www.wff.nasa.gov/balloons. (more…)

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