DOI: 10.1002/2013GL058703
论文题名: Why did the 2011-2012 la Niña cause a severe drought in the Brazilian Northeast?
作者: Rodrigues R.R. ; McPhaden M.J.
刊名: Geophysical Research Letters
ISSN: 0094-10414
EISSN: 1944-10145
出版年: 2014
卷: 41, 期: 3 起始页码: 1012
结束页码: 1018
语种: 英语
英文关键词: Brazilian Climate
; ENSO
; Tropical Atlantic
Scopus关键词: Atmospheric pressure
; Climatology
; Drought
; Rain
; Brazilian Climate
; Eastern pacific
; ENSO
; Intertropical convergence zone
; North Atlantic
; Rainfall anomaly
; Sea Surface Temperature gradients
; Tropical atlantic
; Tropics
; drought stress
; El Nino-Southern Oscillation
; intertropical convergence zone
; La Nina
; numerical model
; precipitation (climatology)
; sea surface temperature
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Brazil
英文摘要: The Brazilian Northeast (NE) is strongly affected by El Niño-Southern Oscillation (ENSO). During La Niña events, the precipitation over the NE is generally above average. However, during the last La Niña event in 2011-2012, the NE went through its worst drought in the last 30 years. In this study, observations and numerical simulations are used to determine what made the 2011-2012 event different from other events. We find that eastern Pacific (canonical) La Niña events cause a cooling of the tropical North Atlantic and warming of the tropical South Atlantic that lead to a southward migration of the Intertropical Convergence Zone, which in turn brings rain to the NE. On the other hand, La Niña events with the cooling concentrated in the central Pacific cause the opposite meridional sea surface temperature (SST) gradient in the tropical Atlantic, leading to droughts over the NE. The 2011-2012 event was of the latter type. This study also shows that it is possible to predict the sign of the NE rainfall anomaly during ENSO events using a simple SST index. Key Points ENSO drives SST anomalies in the tropical Atlantic Central and eastern Pacific events cause opposite precipitation responses A simple inter-basin SST index can be used to predict Northeast precipitation ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893665557&doi=10.1002%2f2013GL058703&partnerID=40&md5=d453852cee53f78d63da1d7110aa3c39
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7678
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geosciences, Federal University of Santa Catarina, Florianõpolis, Brazil
Recommended Citation:
Rodrigues R.R.,McPhaden M.J.. Why did the 2011-2012 la Niña cause a severe drought in the Brazilian Northeast?[J]. Geophysical Research Letters,2014-01-01,41(3).