气候变化领域集成服务门户(CCPortal): Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons

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DOI	10.1007/s00382-020-05276-5
	Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons
	Worou K.; Goosse H.; Fichefet T.; Guichard F.; Diakhate M.
发表日期	2020
ISSN	0930-7575
起始页码	449
结束页码	470
卷号	55
英文摘要	The summer Guinean Coast (GC) rainfall (GCR) displays a strong variability on different timescales that are driven by Sea Surface Temperature (SST) variations and amplified by land–atmosphere processes. However, the relationships between the GCR and SST modes of variability in the pre-monsoon (March–May, MAM), post-monsoon (October–November, ON) and Harmattan (December–February, DJF) seasons are not well known nor understood. Using observational dataset covering the twentieth century, we extend the conclusion obtained in previous studies that mainly analyzed the summer period (June–September, JJAS) by considering changes in SST-rainfall linkages throughout the year. We show that, in boreal winter, SST interannual variability in the tropical basins are anticorrelated with the GCR. The South Atlantic Ocean Dipole (SAOD) and the Atlantic Niño (ATL3) appear, however, as major drivers of the pre-monsoon and monsoon GCR. In MAM, both modes are in opposite phases with the GCR. Below normal SST in the tropical South Atlantic in MAM leads to a surface divergence south of the equator, and the resulting southerlies bring moist air into coastal Guinea, increasing rainfall. During JJAS, ATL3 and SAOD are in phase with the GCR. During ON, the eastern Mediterranean Sea anomalous warming strengthens the Saharan Heat Low, whose extension in the tropical North Atlantic enhances the low-level westerly Jet. This jet transports moisture into GC. The stationarity of the correlations between the GCR and SST indices has also been assessed, and the strongest and most stationary links are obtained during the monsoon season. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Guinea Coast; Monsoon; Rainfall; Stationarity; Teleconnection; Variability
语种	英语
scopus关键词	air-sea interaction; annual variation; coastal zone; data set; land-atmosphere interaction; moisture transfer; rainfall; sea surface temperature; twentieth century; warming; Atlantic Ocean; Atlantic Ocean (North); Atlantic Ocean (South); Guinea; Mediterranean Sea
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/145400
作者单位	Georges Lemaître Centre for Earth and Climate Research (TECLIM), Earth and Life Institute (ELI), Université catholique de Louvain (UCLouvain), Louvain-la-Neuve, Belgium; Centre National de Recherches Météorologiques, Toulouse, France; École Supérieure des Sciences et Techniques de l’Ingénieur, Université Amadou Mahtar Mbow, Dakar, Senegal
推荐引用方式 GB/T 7714	Worou K.,Goosse H.,Fichefet T.,et al. Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons[J],2020,55.
APA	Worou K.,Goosse H.,Fichefet T.,Guichard F.,&Diakhate M..(2020).Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons.Climate Dynamics,55.
MLA	Worou K.,et al."Interannual variability of rainfall in the Guinean Coast region and its links with sea surface temperature changes over the twentieth century for the different seasons".Climate Dynamics 55(2020).