"511e6c26-8806-4d88-9763-a136a6957042" . "ANTARCTIC OSCILLATION"^^ . "The Antarctic Oscillation (AAO) is the dominant pattern of\nnon-seasonal tropospheric circulation variations south of 20S, and it\nis characterized by pressure anomalies of one sign centered in the\nAntarctic and anomalies of the opposite sign centered about\n40-50S. The AAO is also referred to as the Southern Annular Mode\n(SAM). There is a Northern Hemisphere analog to the AAO, and it is\ncalled the Arctic Oscillation (or Northern Annular Mode)."^^ . .