Arctic Oscillation

Arctic Weather and Climate Patterns

Published in Neloy Khare, Climate Change in the Arctic, 2022

The unique geography of the Arctic leads to unusual weather patterns that reappear in the region year after year. Some common weather patterns, such as cyclones or anticyclones, also occur in this region. The Arctic oscillation is an atmospheric circulation pattern that occurs over the mid- to high latitudes of the Northern Hemisphere, including the Arctic.

Sub seasonal variations of weak stratospheric polar vortex in December and its impact on Eurasian air temperature

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Journal Information

Published in Atmospheric and Oceanic Science Letters, 2019

Cheng PENG, Ke FAN, Haixia DAI

The variation in geopotential height over the polar region is closely related to the Northern Annular Mode (NAM). The NAM is a hemispheric-scale pattern of climate variability characterized by an out-of-phase fluctuation in the strength of zonal flow along ~55° and 35°N (Thompson, Baldwin, and Wallace 2002). The downward stratospheric influence is accompanied by descending flow anomalies that induce a tropospheric NAM, or Arctic Oscillation (AO), which are large-scale seesaw patterns between the polar and mid-latitude regions (Baldwin and Dunkerton 2001; Limpasuvan, Thompson, and Hartmann 2004).

Arctic Oscillation

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Arctic Weather and Climate Patterns

Sub seasonal variations of weak stratospheric polar vortex in December and its impact on Eurasian air temperature