Southern Annular Mode

The Souther Annular Mode is the dominate mode of extra-tropical variability in the Southern Hemisphere. It influences ocean temperatures, sea ice (Doddridge & Marshall, 2017), and rainfall.

The data shown here come from the Marshall SAM index (Marshall, 2003), and can be downloaded from https://legacy.bas.ac.uk/met/gjma/sam.html.

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The monthly Southern Annular Mode index.

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The annual Southern Annular Mode index.

References

2017

Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode

Edward W. Doddridge, and John C. Marshall

Geophysical Research Letters, Oct 2017

DOI

2003

Trends in the Southern Annular Mode from Observations and Reanalyses

Gareth J. Marshall

Journal of Climate, Dec 2003

DOI