---
cited_by: []
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).
href: https://data.globalchange.gov/gcmd_keyword/511e6c26-8806-4d88-9763-a136a6957042.yaml
identifier: 511e6c26-8806-4d88-9763-a136a6957042
label: ANTARCTIC OSCILLATION
parent_identifier: b887d3e5-4280-43d2-a34e-0f63ac086b6a
uri: /gcmd_keyword/511e6c26-8806-4d88-9763-a136a6957042