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Arctic Oscillation
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. AcronymsSeeall out |