Arctic Oscillation Pressure Comparison

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These maps show air pressure patterns on November 7, 2010 (left), when the Arctic Oscillation was strongly positive, and on December 18 (right), when it was strongly negative. These phases are the result of the whole atmosphere periodically shifting its weight back and forth between the Arctic and the mid-latitudes of the Atlantic and Pacific Ocean, like water sloshing back and forth in a bowl. (Maps by Ned Gardiner and Hunter Allen, based on Global Forecast System data from the National Centers for Environmental Prediction.)
Originally uploaded in EarthLabs:Climate and the Cryosphere.

Image 33630 is a 408 by 720 pixel JPEG
Uploaded: May21 12

Last Modified: 2012-05-24 18:44:20
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Image courtesy of NOAA (
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