气候变化领域集成服务门户(CCPortal): Toward understanding the occurrence of both wet and dry Sahel seasons during El Niño: The modulating role of the global ocean

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DOI	10.1175/JCLI-D-19-0219.1
	Toward understanding the occurrence of both wet and dry Sahel seasons during El Niño: The modulating role of the global ocean
	Pomposi C.; Kushnir Y.; Giannini A.; Biasutti M.
发表日期	2020
ISSN	0894-8755
起始页码	1193
结束页码	1207
卷号	33 期号:4
英文摘要	Prior research has shown that dry conditions tend to persist in the Sahel when El Niño develops. Yet, during the historic 2015 El Niño, Sahel summer precipitation was anomalously high, particularly in the second half of the season. This seeming inconsistency motivates a reexamination of the variability of precipitation during recent El Niño years. We identify and composite around two different outcomes for Sahel summer season: an anomalously wet season or an anomalously dry season as El Niño develops to its peak conditions over the observational record spanning 1950–2015. We find consistently cool temperatures across the global tropics outside the Niño-3.4 region when the Sahel is anomalously wet during El Niño years and a lack of cooling throughout the tropics when the Sahel is anomalously dry. The striking differences in oceanic surface temperatures between wet years and dry years are consistent with a rearrangement of the entire global circulation in favor of increased rainfall in West Africa despite the presence of El Niño. © 2020 American Meteorological Society.
英文关键词	Climate models; Climatology; Dry condition; Global circulation; Global ocean; Global tropics; Oceanic surface temperature; Peak conditions; Summer precipitation; Summer season; Tropics; air temperature; atmospheric circulation; cooling; dry season; El Nino; global ocean; precipitation (climatology); rainfall; summer; wet season; Sahel [Sub-Saharan Africa]; West Africa
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171445
作者单位	Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Palisades, NY, United States; International Research Institute for Climate and Society, Earth Institute at Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Pomposi C.,Kushnir Y.,Giannini A.,et al. Toward understanding the occurrence of both wet and dry Sahel seasons during El Niño: The modulating role of the global ocean[J],2020,33(4).
APA	Pomposi C.,Kushnir Y.,Giannini A.,&Biasutti M..(2020).Toward understanding the occurrence of both wet and dry Sahel seasons during El Niño: The modulating role of the global ocean.Journal of Climate,33(4).
MLA	Pomposi C.,et al."Toward understanding the occurrence of both wet and dry Sahel seasons during El Niño: The modulating role of the global ocean".Journal of Climate 33.4(2020).