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Arctic could lose most ice in 30 years

03.04.2009
A nearly ice-free Arctic Ocean in the summer may happen three times sooner than scientists had previously estimated.

A new analysis of computer models coupled with the most recent summer ice measurements indicates that the Arctic might lose most of its ice cover in summer in 30 years.

Scientists don't expect the Arctic to become totally ice free, because ice will remain along northern Canada and Greenland. Powerful winds there sweep across the Arctic Ocean, forcing ice layers to slide on top of each other, building up a very thick ice cover.

"The Arctic is changing faster than anticipated," says James Overland of the National Oceanographic and Atmospheric Administration (NOAA). "It's a combination of natural variability, along with warmer air and sea conditions caused by increased greenhouse gases."

Overland and Muyin Wang of the University of Washington, in Seattle, will publish their findings on April 3 in Geophysical Research Letters, a publication of the American Geophysical Union (AGU).

The amount of the Arctic Ocean covered by ice at the end of summer by 2037 could be only about 1 million square kilometers (about 620,000 square miles.) That's compared to today's ice extent of 4.6 million square kilometers (2.8 million square miles.) So much more open water could be a boon for shipping and for extracting minerals and oil from the seabed, but it could also cause an ecosystem upheaval.

The United Nations Intergovernmental Panel on Climate Change in 2007 assessed what might happen in the Arctic in the future by running 23 global climate models. But Wang, a climate scientist, and Overland, an oceanographer with NOAA's Pacific Marine Environmental Laboratory in Seattle, reasoned that dramatic declines in the extent of ice at the end of summer in 2007 and 2008 called for a more refined approach.

The new projections are based on those six of the 23 models that are most suited for assessing sea ice, according to Wang, the lead author of the study. She and Overland sought models that best matched what has actually happened in recent years. Among the models eliminated were those showing way too little ice or way too much ice compared to conditions that have occurred.

Wang says she and Overland chose models that accurately reflect the difference between summer and winter ice packs. That distinction demonstrates the model's ability to take into account changing amounts of solar radiation. Among the six models fitting the researchers' criteria, three have sophisticated sea-ice physics and dynamics capabilities.

Once the extent of ice at the end of summer drops to 4.6 million square kilometers -- it was actually 4.3 million square kilometers in 2007 and 4.7 million in 2008 -- all six models show rapid sea-ice declines. Averaged together, the models point to a nearly ice-free Arctic in 32 years, with some of the models putting the event as early as 11 years from now.

Maria-Jose Vinas | American Geophysical Union
Further information:
http://www.agu.org

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