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09-02-2014, 04:49 PM #1
Arctic Ice Melt Lets Cold Air Flow South
Polar Vortex Escape: Arctic Ice Melt Lets Cold Air Flow South: Study
Remember the polar vortex, the huge mass of Arctic air that can plunge much of the U.S. into a deep freeze? A new study says that as the world gets warmer, parts of North America, Europe and Asia could see more frequent and stronger visits of that cold air. Shrinking ice in the seas off Russia leaves more water uncovered, allowing more energy to enter the atmosphere and weakening the jet stream, which usually keeps Arctic air from wandering south, said study co-author Jin-Ho Yoon of the Pacific Northwest National Laboratory in Richland, Washington.
In the study, published Tuesday in Nature Communications, scientists from South Korea and United States found that many such cold outbreaks happened a few months after unusually low sea ice levels off Russia. The study saw the same link using historical data and computer simulations, according to lead author Baek-Min Kim of the Korea Polar Research Institute. Sea ice in the Arctic reached a record low in 2012; it's slightly up this year. Kevin Trenberth, climate analysis chief at the National Center for Atmospheric Research in Boulder, is skeptical. His research points more to the Pacific for changes in the jet stream and polar vortex behavior.
http://www.nbcnews.com/science/envir...r-flow-n194061
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