Parameter Tree:
EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > ANTARCTIC OSCILLATION

Definition:
The Antarctic Oscillation (AAO) is the dominant pattern of
non-seasonal tropospheric circulation variations south of 20S, and it
is characterized by pressure anomalies of one sign centered in the
Antarctic and anomalies of the opposite sign centered about
40-50S. The AAO is also referred to as the Southern Annular Mode
(SAM). There is a Northern Hemisphere analog to the AAO, and it is
called the Arctic Oscillation (or Northern Annular Mode).


Reference:
Joint Institute for the Study of the Atmosphere and Ocean, U. Washington
http://www.jisao.washington.edu/data/aao/