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Antarctic Circumpolar Wave


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(ACW)

A set of anomalies in atmospheric pressure, sea-ice cover, sea-surface temperature, and wind stress that propagate eastwards around the Antarctic continent. The anomalies originate from oceanic Rossby waves within the Antarctic Circumpolar Current, approximately between latitudes 40° S and 70° S. These waves are most noticeable as four alternating regions of warm tropical water and cold polar water. They take c.8–10 years to circle the globe, and may be directly linked through a teleconnection with El Niño Southern Oscillation activity. Distinct correlations exist with weather over South America, South Africa, Australia, and New Zealand.

Subjects: Meteorology and Climatology.


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