Concept information
Preferred term
Southern Annular Mode
Definition(s)
- The leading mode of climate variability of Southern Hemisphere sea level pressure and geopotential height, which is associated with the strength and latitudinal shifts in the mid- to high-latitudes westerly wind belt. The SAM is also known as the Antarctic Oscillation (AAO). A positive SAM phase is defined as lower-than-normal pressures over the polar regions and higher-than-normal pressures in the southern mid-latitudes, with a contraction towards Antarctica and strengthening of the westerly wind belt. The negative SAM phase exhibits positive high-latitude pressure anomalies, negative mid-latitude pressure anomalies and a weaker westerly flow expanded towards the equator. (Source: https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_FullReport.pdf)
Broader concept(s)
Synonym(s)
- AAO
- SAM
In other languages
-
French
-
OAA
-
oscillation antarctique
URI
http://data.loterre.fr/ark:/67375/CHC-TM4HGRSN-C
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