DOI: 10.3354/cr01354
Scopus记录号: 2-s2.0-84966460158
论文题名: La Niña events before and after 1979 and their impact in southeastern South America during austral summer: Role of the Indian Ocean
作者: Cazes-Boezio G. ; Talento S.
刊名: Climate Research
ISSN: 0936577X
出版年: 2016
卷: 68, 期: 2019-02-03 起始页码: 257
结束页码: 276
语种: 英语
英文关键词: 1970s change
; ENSO
; La Niña
; Southeastern South America
; SST anomalies
Scopus关键词: annual variation
; atmospheric circulation
; atmospheric general circulation model
; circulation modeling
; climate variation
; El Nino-Southern Oscillation
; La Nina
; rainfall
; sea surface temperature
; summer
; Brazil
; Indian Ocean
; South America
; Uruguay
英文摘要: In this study, we analyzed the influence of interannual variability in sea surface temperature (SST) on the climate of southeastern South America (SESA) during austral summer. We found that the correlation between the El Niño Southern Oscillation (ENSO) and rainfall over southern Brazil-northern Uruguay (SB-NU) was not statistically significant between 1949 and 1978, but it was significant between 1979 and 2009. The results show that this change in correlation was largely due to the modified rainfall response over SB-NU to La Niña events. A cluster analysis for all summers between 1949 and 2009 identified a turning point of La Niña events in 1979. We document the atmospheric circulation patterns associated with the strong correlation between ENSO and the rainfall over SB-NU after 1979 and hypothesize causes of the weaker correlation in the earlier period. In particular, numerical simulations produced using the UCLA atmospheric general circulation model showed important differences between upper tropo spheric circulation patterns during ENSO cold episodes after the late 1970s relative to the earlier period. Such differences were consistent with changes in the impacts of La Niña events on SESA. The differences in Indian Ocean SST anomalies largely explained these results. © The authors 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116411
Appears in Collections: 气候减缓与适应
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Recommended Citation:
Cazes-Boezio G.,Talento S.. La Niña events before and after 1979 and their impact in southeastern South America during austral summer: Role of the Indian Ocean[J]. Climate Research,2016-01-01,68(2019-02-03)