Arctic Oscillation An atmospheric circulation pattern in which the atmospheric pressure over the polar regions varies in opposition with that over middle latitudes (about 45 degrees North) on time scales ranging from weeks to decades.
Arctic Oscillation (AO) - The Arctic Oscillation is a pattern in which atmospheric pressure at polar and middle latitudes fluctuates between negative and positive phases.
[edit] Northern Annualar Mode (NAM) or Arctic Oscillation (AO)
The NAM, or AO, is defined as the first EOF of northern hemisphere winter SLP data from the tropics and subtropics.
The internationally recognized unit used by the Atmospheric Environment Service for measuring atmospheric pressure. Abbreviated kPa.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AO, Arctic Oscillation, ARSI, ...
 See also: Arctic, Circulation, Weather, Radiation, Meteor
  
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