Antarctic Oscillation signal on precipitation anomalies over southeastern South America

The relation between the Antarctic Oscillation (AAO) and the precipitation in southeastern South America (SESA) is examined. The AAO influence is particularly strong during winter and late spring although of opposite sign. In particular during spring, AAO positive (negative) phases are associated wi...

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Bibliographic Details
Main Authors: Silvestri, G.E., Vera, C.S.
Format: Journal/Newspaper
Language:unknown
Subjects:
Climatology
Oscillations
Precipitation (meteorology)
Oscillation signals
Geophysics
annual variation
atmosphere-ocean coupling
El Nino-Southern Oscillation
precipitation (climatology)
teleconnection
South America
Antarc*
Antarctic
Online Access:https://hdl.handle.net/20.500.12110/paper_00948276_v30_n21_pCLM3_Silvestri
Description
Summary:The relation between the Antarctic Oscillation (AAO) and the precipitation in southeastern South America (SESA) is examined. The AAO influence is particularly strong during winter and late spring although of opposite sign. In particular during spring, AAO positive (negative) phases are associated with the intensification of an upper-level anticyclonic (cyclonic) anomaly, weakened (enhanced) moisture convergence and decreased (increased) precipitation over SESA. The combined influence of both ENSO and AAO on SESA precipitation was also explored and significant correlation values between both oscillations are only observed during spring. Results show that during that particular season, AAO activity produces a strong modulation of the ENSO signal on SESA precipitation. Copyright 2003 by the American Geophysical Union.

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