Posted on August 31, 2014 by Bob Berwyn
‘The interaction between air, sea and ice in these seas is central to the stability of the Antarctic Ice Sheet and global sea levels’
A new study tracks global warming impacts around Antarctica. bberwyn photo.
By Summit Voice
FRISCO — Global warming is upsetting the delicate balance between Antarctic ice, air and sea, University of Southampton scientists said this week, releasing results of a study showing a rapid rise in sea level around the frozen continent.
Based on an analysis of 19 years worth of satellite data, the researcher said sea level around the coast of Antarctica has climbed 2 centimeters more than the global average, driven almost entirely by an increase in freshwater, which is less dense than saltwater. That can cause localized increases in sea level, said Craig Rye, lead author of the paper published in the journal Nature Geoscience. Continue reading
Filed under: Antarctica, climate and weather, Environment, global warming | Tagged: Antarctica, climate change, Environment, global warming, sea level | Leave a comment »
Posted on August 23, 2014 by Bob Berwyn
Science mission finds microbial life beneath Antarctic ice sheets. bberwyn photo.
Simple organisms process basic elements to survive
FRISCO —Tiny organisms living beneath the vast Antarctic ice fields can convert ammonium and methane into the energy required for growth, surviving in one of the most unlikely environments on Earth, according to scientists who studied a subsurface lake that hasn’t seen sunlight for millions of years.
“We were able to prove unequivocally to the world that Antarctica is not a dead continent,” said Montana State University professor John Priscu, the chief scientist of the U.S. project called WISSARD that sampled the sub-ice environment. Continue reading
Filed under: Antarctica, biodiversity, Environment | Tagged: Antarctica, climate, Environment, subglacial lakes, WISSARD | Leave a comment »
Posted on August 20, 2014 by Bob Berwyn
Loss of ice volume doubles in just 5 years
Arctic and Antarctic ice sheets are losing volume at a record pace. bberwyn photo.
By Bob Berwyn
FRISCO —Detailed new data from satellites and other sources show the world’s major ice sheets losing volume at a record pace, faster than at any time since satellite measurements started about 20 years ago.
Since 2009, the rate of volume loss from the Greenland Ice Sheet has doubled, and the rate of volume loss from the West Antarctic Ice Sheet has tripled, according to the new findings from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research. Continue reading
Filed under: Antarctica, climate and weather, Environment, global warming, Greenland | Tagged: climate change, global warming, Greenland ice sheet, sea level, West Antarctic Ice Sheet | 1 Comment »
Posted on August 16, 2014 by Bob Berwyn
‘Official’ IPCC sea level estimates may be too low
Antarctica ice is becoming a bigger factor in global sea level rise. bberwyn photo.
By Bob Berwyn
FRISCO — Although Antarctica’s vast ice sheets are only a small factor in global sea level rise right now, that’s likely to change in coming decades, scientists said after a new analysis of ocean temperatures around the frozen continent.
“If greenhouse gases continue to rise as before, ice discharge from Antarctica could raise the global ocean by an additional 1 to 37 centimeters in this century already,” says lead author Anders Levermann, with the Potsdam Institute for Climate Impact Research. “Now this is a big range – which is exactly why we call it a risk: Science needs to be clear about the uncertainty, so that decision makers at the coast and in coastal megacities like Shanghai or New York can consider the potential implications in their planning processes,” says Levermann.
The scientists analyzed how rising global mean temperatures resulted in a warming of the ocean around Antarctica, thus influencing the melting of the Antarctic ice shelves. The marine ice sheets in West Antarctica alone have the potential to elevate sea level by several meters – over several centuries. Continue reading
Filed under: Antarctica, climate and weather, Environment | Tagged: Antarctica, climate change, global warming, sea level, West Antarctic Ice Sheet | Leave a comment »
Posted on July 24, 2014 by Bob Berwyn
Fur seals on Half Moon Island, in the South Shetland chain, off the Antarctic Peninsula. bberwyn photo.
Survival of the fittest?
By Summit Voice
FRISCO — After studying fur seals around Antarctica for decades, researchers with the British Antarctic Survey say they’re seeing distinct genetic changes related to a changing climate and food availability. But despite a shift towards individuals more suited to changing environmental conditions, this fitness is not passing down through generations, leaving the fur seal population on South Georgia Island in decline. Continue reading
Filed under: Antarctica, biodiversity, climate and weather, global warming | Tagged: Antarctica, British Antarctic Survey, fur seals, genetic adaptation, global, warming | Leave a comment »
Posted on July 23, 2014 by Bob Berwyn
Growth in sea ice may be slower than reported
Scientists are puzzling over the expansion of Antarctic sea ice. bberwyn photo.
FRISCO — Global warming deniers have long been using the observed expansion of Antarctic sea ice as a way to try and confuse the public about the reality of global warming, but some new research by scientists with the Scripps Institution of Oceanography at University of California San Diego suggests the rate of expansion is not as dramatic as reported.
The findings, published in The Cryosphere (European Geosciences Union) acknowledge that there has been some expansion recently, but that some of the reported ice gain may be due to inconsistencies in computer models used to measure Antarctic sea ice. Continue reading
Filed under: Antarctica, climate and weather, global warming | Tagged: antarctic sea ice, climate, global warming, IPCC | Leave a comment »
Posted on July 1, 2014 by Bob Berwyn
Emperor penguins in Antarctica. Photo courtesy BAS.
New study projects 50 percent decline by century’s end as sea ice habitat dwindles
FRISCO — Antarctica’s emperor penguins may be colonizing new territory right now, but the long-term outlook for the birds is grim, according to new research showing that changes in sea ice concentration will likely cause most colonies to decline by 50 percent by the end of the century.
Even the most remote reaches of Antarctica won’t be immune to the changes, the study leaders said, describing the results of their findings in a new article in the journal Nature Climate Change.
The study concludes that emperor penguins are fully deserving of an endangered species listing based on global warming threats. The research will help inform federal bio-crats as they ponder a listing under the Endangered Species Act. Continue reading
Filed under: Antarctica, biodiversity, climate and weather, Environment, global warming | Tagged: Antarctica, climate change, emperor penguins, Environment, global warming | Leave a comment »