气候变化领域集成服务门户(CCPortal): Revisiting remote drivers of the 2014 drought in South-Eastern Brazil

CCPortal

DOI	10.1007/s00382-020-05442-9
	Revisiting remote drivers of the 2014 drought in South-Eastern Brazil
	Finke K.; Jiménez-Esteve B.; Taschetto A.S.; Ummenhofer C.C.; Bumke K.; Domeisen D.I.V.
发表日期	2020
ISSN	0930-7575
起始页码	3197
结束页码	3211
卷号	55
英文摘要	South-Eastern Brazil experienced a devastating drought associated with significant agricultural losses in austral summer 2014. The drought was linked to the development of a quasi-stationary anticyclone in the South Atlantic in early 2014 that affected local precipitation patterns over South-East Brazil. Previous studies have suggested that the unusual blocking was triggered by tropical Pacific sea surface temperature (SST) anomalies and, more recently, by convection over the Indian Ocean related to the Madden–Julian Oscillation. Further investigation of the proposed teleconnections appears crucial for anticipating future economic impacts. In this study, we use numerical experiments with an idealized atmospheric general circulation model forced with the observed 2013/2014 SST anomalies in different ocean basins to understand the dominant mechanism that initiated the 2014 South Atlantic anticyclonic anomaly. We show that a forcing with global 2013/2014 SST anomalies enhances the chance for the occurrence of positive geopotential height anomalies in the South Atlantic. However, further sensitivity experiments with SST forcings in separate ocean basins suggest that neither the Indian Ocean nor tropical Pacific SST anomalies alone have contributed significantly to the anomalous atmospheric circulation that led to the 2014 South-East Brazil drought. The model study rather points to an important role of remote forcing from the South Pacific, local South Atlantic SSTs, and internal atmospheric variability in driving the persistent blocking over the South Atlantic. © 2020, The Author(s).
英文关键词	Blocking; Brazil 2014 drought; ENSO; MJO; Teleconnection
语种	英语
scopus关键词	anticyclone; atmospheric circulation; atmospheric forcing; drought; El Nino-Southern Oscillation; Madden-Julian oscillation; sea surface temperature; seasonal variation; teleconnection; temperature anomaly; Brazil; Indian Ocean; Pacific Ocean; Pacific Ocean (Tropical)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145254
作者单位	Department of Meteorology, Stockholm University, Stockholm, Sweden; Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Climate Change Research Centre, University of New South Wales, Sydney, Australia; ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, Australia; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, United States; Marine Meteorology Department, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Finke K.,Jiménez-Esteve B.,Taschetto A.S.,et al. Revisiting remote drivers of the 2014 drought in South-Eastern Brazil[J],2020,55.
APA	Finke K.,Jiménez-Esteve B.,Taschetto A.S.,Ummenhofer C.C.,Bumke K.,&Domeisen D.I.V..(2020).Revisiting remote drivers of the 2014 drought in South-Eastern Brazil.Climate Dynamics,55.
MLA	Finke K.,et al."Revisiting remote drivers of the 2014 drought in South-Eastern Brazil".Climate Dynamics 55(2020).