Combined performance of September's Weddell sea ice extent, Southern Annular Mode, and Atlantic SST anomalies over the South American temperature and precipitation

被引：2
作者：
Vasconcellos, Fernanda C. [1 ]
Oliva, Fabio G. [2 ]
Pizzochero, Renan M. [4 ]
Da Silva, Telma M. [2 ]
Parise, Claudia K. [3 ]
De Caldas, Catharine F. [1 ]
机构：
[1] Univ Fed Rio de Janeiro UFRJ, Grp Estudos Previsoes & Anal Climat GEPAC, Dept Meteorol, Av Athos da Silveira Ramos 274, BR-21941916 Rio De Janeiro, RJ, Brazil
[2] Univ Fed Rio de Janeiro UFRJ, Programa Posgrad Geog PPGG, Av Athos da Silveira Ramos 274, BR-21941916 Rio De Janeiro, RJ, Brazil
[3] Univ Fed Maranhao UFMA, Lab Estudos Oceanog Geol LEOG, Dept Oceanog & Limnol, Ave Portugueses 1966, BR-65080805 Sao Luis, Maranhao, Brazil
[4] Inst Nacl Pesquisas Espaciais INPE, Rodovia Presidente Dutra,Km 39, Cachoeira Paulista, SP, Brazil
来源：
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS | 2022年 / 94卷
关键词：
Antartic sea ice; variability modes; South America; precipitaion; temperature; HEMISPHERE ATMOSPHERE; INTERANNUAL ACTIVITY; SURFACE TEMPERATURE; COUPLED VARIABILITY; CONVERGENCE ZONE; DIPOLE; CLIMATOLOGY; CIRCULATION; INTENSITY; PHASES;
D O I：
10.1590/0001-3765202220210803
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Th is paper aims to analyze the relationships amongtropicaL (Atlantic MeridionaL Mode - AMM), subtropical (South Atlantic Subtropical Gradient - SASG), and extratropicaL (Southern Annular Mode - SAM) teLeconnection patterns, the Weddell Sea (WS) sea ice extents, and the climate in South America. Warm anomalies are observed in most of South America for maximum WS ice extent combinations (negative SAM/positive AMM and negative SAM/positive SASG composites), with an opposite signaL at tropical South America for minimum WS ice extent combinations (positive SAM/negative AMM and positive SAM/negative SASG). Over Southern Argentina, colder (warmer) temperatures are seen at the negative SAM/positive SASG (positive SAM/negative SASG). Drier (wetter) conditions are found over most South America at maximum (minimum) WS ice extent combinations. Wavetrains from different Pacific and Indian Oceans regions are related to high-level anomalous cyclonic (anticyclonic) circulation over the continent at maximum (minimum) WS ice extent configuration, which explains the climate impacts found. The SASG signaL displaces the anomaly circulations eastward from South America, impacting the adjacent Atlantic Ocean region more intensely concerning the other modes. The results discussed here indicated that these patterns (SAM, AMM, SASG, and sea ice extent) have significant Links with the South American climate variability.
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页数：20
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