New theory suggests why Arctic is warming so fast

The Arctic has experienced the warming effects of global climate change faster than any other region on the planet. A new theory aided by computer simulations is helping explain why.

Scientists at the Scripps Institution of Oceanography have developed a new theory aided by computer simulations and observations that helps explain why the Arctic is warming faster than any other region on the planet.

A team led by Scripps researcher Emma Beer observed the changes taking place in the Arctic Ocean, which is largely covered by sea ice for most of the year. There, an unusual situation exists where the water is warm at depth and cold near the surface, explains a statement.

The deeper waters are fed by the relatively warm Pacific and Atlantic oceans, whereas the near-surface waters are in contact with sea ice and remain close to the freezing point. Heat flows upward from the warmer water to the colder water.

The scientists found that the deeper water is getting still warmer as a result of climate change, but the near-surface water below the sea ice remains close to the freezing point. The increasing difference in temperature leads to a greater upward flow of heat.

Beer, Scripps climate scientist Ian Eisenman, and researcher Till Wagner of the University of North Carolina estimate that this phenomenon is responsible for about 20per centof the amplification of global warming that occurs in the Arctic.

“While previous work has found mechanisms related to the surface and the atmosphere that cause Arctic amplification, our finding is that there is also a fundamental reason why the ocean causes polar amplification when the polar region is covered with sea ice,” said climate scientist Ian Eisenman of the National Science Foundation-supported study.

Photo credit: Liam Quinn, flickr/Creative Commons

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