Definition of Antarctic Oscillation Index

• Published in: Geophysical Research Letters
• Main Authors: Gong, DY, Wang, SW
• Other Authors: Gong, DY (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China., Peking Univ, Dept Geophys, Beijing 100871, Peoples R China.
• Format: Journal/Newspaper
• Language: English
• Published: geophysical research letters 1999
• Subjects: SOUTHERN-HEMISPHERE; VARIABILITY; CIRCULATION; SIMULATIONS; CYCLE; Antarctic; The Antarctic; Antarc*
• Online Access: https://hdl.handle.net/20.500.11897/155501; https://doi.org/10.1029/1999GL900003

Following Walker's work about his famous three: oscillations published during the 1920-30s, many papers were written about atmospheric oscillations. A fourth atmospheric oscillation in the middle and high southern latitudes was found, and named the Antarctic Oscillation (AO). AO refers to a large scale alternation of atmospheric mass between the mid-latitudes and high latitudes surface pressure. In order to understand the spatial structure of sea level pressure variation in detail, empirical orthogonal function analysis is applied. An objective index of the Antarctic Oscillation Index (AOI) is defined as the difference of zonal mean sea level pressure between 40 degrees S and 65 degrees S. The AOI has the potential for clarifying climate regimes in the southern hemisphere, Similar to how the NAO and the NPO has been used in the northern hemisphere. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000078620400007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Geosciences, Multidisciplinary SCI(E) EI 416 ARTICLE 4 459-462 26