Missing Icecap Begets More Melting

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This from Jeff Master’s Wunderblog on the disappearance of summer Arctic sea ice. The record low was smashed (again) just last week:

With one third of the Arctic ice cap already gone, and another month of melting to go, we need to consider what effect this will have on weather, climate, and sea level rise. Well, we don’t need to worry about sea level rise, since the polar sea ice is already in the ocean, and won’t appreciably change sea level when it melts. However, the remarkable melting of the ice cap will likely lead to unusual weather patterns this fall and winter. The lack of sea ice will put much more heat and moisture into the polar atmosphere, affecting the path of the jet stream and the resultant storm tracks. Expect a much-delayed arrival of winter to the Northern Hemisphere again this year, which may lead to further accelerated melting of the ice cap in future years.

Here’s an animation of the past, present and forecast future from UCAR. JULIA WHITTY

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