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Arctic Oscillation |
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Arctic Oscillation [¦ärd·ik ‚äs·ə′lā·shən] (meteorology) Atmospheric pressure fluctuations (positive and negative phases) between the polar and middle latitudes (above 45° North) that strengthen and weaken the winds circulating counterclockwise from the surface to the lower stratosphere around the Arctic and, as a result, modulate the severity of the winter weather over most Northern Hemisphere middle and high latitudes. Also known as the Northern Hemisphere annular mode. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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When the index is calculated and presented by month or by week, there may be a greater likelihood of presenting a relationship with other indices, specifically, ENSO, the Pacific Decadal Oscillation, the North Atlantic Oscillation or the Arctic Oscillation. In the late 1980s and 1990s the Arctic Oscillation was relatively warm, and so was the United States. Thompson of the University of Washington called this pattern the Arctic oscillation in the May 1, 1998 GEOPHYSICAL RESEARCH LETTERS. |
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