Antarctic Oscillation signal on precipitation anomalies over southeastern South America

被引：182

作者：

Silvestri, GE ^{[1
]}

Vera, CS

机构：

[1] Consejo Nacl Invest Cient & Tecn, CIMA, Buenos Aires, DF, Argentina

[2] Univ Buenos Aires, Dept Ciencias Atmosfera & Oceanos, RA-1053 Buenos Aires, DF, Argentina

来源：

GEOPHYSICAL RESEARCH LETTERS | 2003年 / 30卷 / 21期

关键词：

D O I：

10.1029/2003GL018277

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：CLM3 / 1

页数：4