DOI: 10.1002/joc.5891
Scopus记录号: 2-s2.0-85056121995
论文题名: Effects of two different La Niña types on the South American rainfall
作者: Andreoli R.V. ; Kayano M.T. ; Viegas J. ; de Oliveira S.S. ; de Souza R.A.F. ; Garcia S.R. ; Rego W.H.T. ; de Oliveira M.B.L.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
卷: 39, 期: 3 起始页码: 1415
结束页码: 1428
语种: 英语
英文关键词: La Niña
; precipitation
; South America
Scopus关键词: Precipitation (chemical)
; Rain
; Surface waters
; Tropics
; Atmospheric circulation patterns
; Circulation patterns
; Climate monitoring
; Northeastern Brazil
; Precipitation anomalies
; Sea surface temperature anomalies
; South America
; Tropical atlantic
; Oceanography
英文摘要: The paper tests if the two La Niña (LN) types can be distinguished from each other using their climate impacts on northeastern Brazil (NEB). To this end, all LN events during the 1901–2010 period followed by a wet or dry rainy season (from February to April) in NEB are classified into two categories: WET-LN and DRY-LN. The global and regional anomalous atmospheric circulation patterns and the rainfall anomaly patterns in South America associated with the two cases are analysed. The WET-LN and DRY-LN events present, respectively, the eastern Pacific LN and central Pacific LN sea surface temperature (SST) anomaly features in the tropical Pacific. On the other hand, the WET-LN features an interhemispheric SST dipole pattern in the tropical Atlantic, and the DRY-LN, colder-than-normal surface waters in the tropical South Atlantic (TSA) and equatorial Atlantic during MAM(+1). The two analysed cases show regional differential circulation patterns in all seasons. The anomalous wetness over northern and northwestern South America occurs for the WET-LN type during JJA(0)–DJF(+1) and for the DRY-LN type, during DJF(+1)–MAM(+1). The anomalous dryness over SESA is more evident for the WET-LN during JJA(0) and MAM(+1), and for the DRY-LN, during SON(0). Anomalous dryness occurs in central and eastern South America noted during JJA(0) and DJF(+1) for both cases analysed. The precipitation anomalies in northern South America during DJF(+1) are stronger and more extensive for the DRY-LN than for the WET-LN events due to the action of both the anomalous (double) Walker and Hadley cells for the DRY-LN, in contrast with the exclusive action of an anomalous Walker cell for the WET-LN case. Also, a double Walker cell drives the dry–wet dipole between northern South America and NEB during MAM(+1) for the DRY-LN. Our results might be useful mainly for climate monitoring purposes. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116543
Appears in Collections: 全球变化的国际研究计划
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作者单位: Universidade do Estado do Amazonas, Escola Superior de Tecnologia, Manaus, Brazil; Divisão de Modelagem e Desenvolvimento, Centro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil; Programa de Pós-Graduação em Clima e Ambiente (CLIAMB, INPA/UEA), Manaus, Brazil; Instituto de Recursos Naturais, Universidade Federal de Itajubá, Itajubá, Brazil
Recommended Citation:
Andreoli R.V.,Kayano M.T.,Viegas J.,et al. Effects of two different La Niña types on the South American rainfall[J]. International Journal of Climatology,2019-01-01,39(3)