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Post Info TOPIC: Arctic Oscillation
Blobrana


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NSF-supported Researchers Pinpoint 1,500-Year Cycle in Arctic Atmospheric Pattern

A team of scientists supported by the National Science Foundation (NSF) has identified for the first time a clear 1,500-year cycle in the far North's surface atmosphere pressure pattern. Called the Arctic Oscillation (AO), the cycle greatly influences weather in the Northern Hemisphere.
Lead researcher Dennis Darby, a geological oceanographer at Virginia's Old Dominion University, used the findings to describe a worst-case scenario in which the cyclical pressure pattern could combine with man-made climate change to exacerbate severe weather and flooding trends.
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Blobrana


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The Arctic oscillation (AO) or Northern Annular Mode/Northern Hemisphere Annular Mode (NAM) is an index (which varies over time with no particular periodicity) of the dominant pattern of non-seasonal sea-level pressure variations north of 20N latitude, and it is characterized by pressure anomalies of one sign in the Arctic with the opposite anomalies centred about 37-45N.
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