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Wikipedia definition
1. Antarctic oscillationThe Antarctic oscillation (AAO, to distinguish it from the Arctic oscillation or AO) is a low-frequency mode of atmospheric variability of the southern hemisphere. It is also known as the Southern Annular Mode (SAM) or Southern Hemisphere Annular Mode (SHAM).
Read “Antarctic oscillation” on English Wikipedia
Read “南極振動” on Japanese Wikipedia
Read “Antarctic oscillation” on DBpedia

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