气候变化领域集成服务门户(CCPortal): ENSO-driven coupled megadroughts in North and South America over the last millennium

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DOI	10.1038/s41561-021-00819-9
	ENSO-driven coupled megadroughts in North and South America over the last millennium
	Steiger N.J.; Smerdon J.E.; Seager R.; Williams A.P.; Varuolo-Clarke A.M.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:10
英文摘要	Geological evidence from the last millennium indicates that multidecadal megadroughts may have occurred simultaneously in California and Patagonia at least once. However, it is unclear whether or not megadroughts were common in South America, whether or not simultaneous megadroughts in North and South America occurred repeatedly, and what would cause their simultaneous occurrence. Here we use a data-assimilation-based global hydroclimate reconstruction, which integrates palaeoclimate records with constraints from a climate model, to show that there were about a dozen megadroughts in the South American Southwest over the last millennium. Using dynamical variables from the hydroclimate reconstruction, we show that these megadroughts were driven by the El Niño/Southern Oscillation (ENSO). We also find that North American Southwest and South American Southwest megadroughts have occurred simultaneously more often than expected by chance. These coincident megadroughts were driven by an increased frequency of cold ENSO states relative to the last millennium-average frequency. Our results establish the substantial risk that exists for ENSO-driven, coupled megadroughts in two critical agricultural regions. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	drought; El Nino-Southern Oscillation; paleoclimate; risk; California; Patagonia; South America; United States
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/250863
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Department of Geography, University of California Los Angeles, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Steiger N.J.,Smerdon J.E.,Seager R.,et al. ENSO-driven coupled megadroughts in North and South America over the last millennium[J],2021,14(10).
APA	Steiger N.J.,Smerdon J.E.,Seager R.,Williams A.P.,&Varuolo-Clarke A.M..(2021).ENSO-driven coupled megadroughts in North and South America over the last millennium.Nature Geoscience,14(10).
MLA	Steiger N.J.,et al."ENSO-driven coupled megadroughts in North and South America over the last millennium".Nature Geoscience 14.10(2021).