气候变化领域集成服务门户(CCPortal): Common cause for severe droughts in South America and marine heatwaves in the South Atlantic

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DOI	10.1038/s41561-019-0393-8
	Common cause for severe droughts in South America and marine heatwaves in the South Atlantic
	Rodrigues R.R.; Taschetto A.S.; Sen Gupta A.; Foltz G.R.
发表日期	2019
ISSN	17520894
卷号	12 期号:8
英文摘要	In 2013/14 eastern South America experienced one of its worst droughts. At the same time an unprecedented marine heatwave developed in the western South Atlantic. The drought was linked to suppression of the South Atlantic convergence zone and its associated rainfall, which led to water shortages in Brazil and impacted food supplies globally. Here we show from observations that such droughts and adjacent marine heatwaves have a common remote cause. Atmospheric blocking triggered by tropical convection in the Indian and Pacific oceans can cause persistent anticyclonic circulation that not only leads to severe drought but also generates marine heatwaves in the adjacent ocean. We show that increased shortwave radiation due to reduced cloud cover and reduced ocean heat loss from weaker winds are the main contributors to the establishment of marine heatwaves in the region. The proposed mechanism, which involves droughts, extreme air temperature over land and atmospheric blocking explains approximately 60% of the marine heatwave events in the western South Atlantic. We also identified an increase in frequency, duration, intensity and extension of marine heatwave events over the satellite period 1982–2016. Moreover, surface primary production was reduced during these events with implications for regional fisheries. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	anticyclone; atmospheric blocking; atmospheric convection; convergence; drought; food supply; heat wave; marine environment; shortwave radiation; tropical environment; Atlantic Ocean; Atlantic Ocean (South); Brazil; Indian Ocean; Pacific Ocean
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124630
作者单位	Department of Oceanography, Federal University of Santa Catarina, Florianópolis, Brazil; Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia; NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States
推荐引用方式 GB/T 7714	Rodrigues R.R.,Taschetto A.S.,Sen Gupta A.,et al. Common cause for severe droughts in South America and marine heatwaves in the South Atlantic[J],2019,12(8).
APA	Rodrigues R.R.,Taschetto A.S.,Sen Gupta A.,&Foltz G.R..(2019).Common cause for severe droughts in South America and marine heatwaves in the South Atlantic.Nature Geoscience,12(8).
MLA	Rodrigues R.R.,et al."Common cause for severe droughts in South America and marine heatwaves in the South Atlantic".Nature Geoscience 12.8(2019).