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.
References in periodicals archive ?
Jarvenoja, Arctic Oscillation and its impact on Finland's climate: XXII Geophysical Days, May 19-20, Helsinki, 2005.
Relationships between El Nino-Southern Oscillation and the Arctic Oscillation: A Climate-Weather Link.
The interannual variations in the water balance of the lakes were related to the duration of the open-water season and seemed to reflect climate variations caused by changes in regional atmospheric pressure differentials (mainly the Pacific Decadal and Arctic oscillations).
Building on this success in unraveling ENSO, meteorologists and oceanographers have begun to identify a host of other ocean-atmosphere oscillations operating in the earth's climate system: the North Atlantic Oscillation, the Arctic Oscillation, the Antarctic Oscillation, the Pacific Decadal Oscillation, the Indian Ocean Dipole, and the Antarctic Circumpolar Wave.
That creates stronger westerlies and increases the warm periods of the Arctic oscillation - the El Nino-like weather system that affects the northern hemisphere.
Thompson of the University of Washington called this pattern the Arctic oscillation in the May 1, 1998 GEOPHYSICAL RESEARCH LETTERS.
Our results also imply that even under human-induced warming, extreme cold events can still occur as a result of natural variability, such as Arctic Oscillation, which was believed to be responsible for the reporting event (Cheung et al.
NAO, or its hemispheric counterpart Arctic oscillation (AO), has a significant impact on the shape and strength of the Siberian High (SH) and thus on land surface winter temperatures [35].
Diminishing Arctic sea ice can cause changes in atmospheric circulation that lead to a circulation pattern that is different than the "negative phase" of the Arctic Oscillation.
The lag between bowhead whale incursion into the northern CAA and driftwood delivery from the Arctic Ocean is significant, because it may have occurred during an interval when the Arctic Oscillation was in a positive phase (Kaufman et al., 2004).

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