气候变化领域集成服务门户(CCPortal): Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements

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DOI	10.1029/2020JC017041
	Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements
	Houndegnonto O.J.; Kolodziejczyk N.; Maes C.; Bourlès B.; Da-Allada C.Y.; Reul N.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	In the eastern Gulf of Guinea (GG), freshwater originated from rivers discharges into the ocean and high precipitation rate are key contributors to the upper ocean vertical density stratification, and play a key role in modulating local air-sea interactions as well as biogeochemical cycle. Nevertheless, the dynamics of the GG freshwater plumes remain poorly documented because of the scarcity of historical, in situ observations and the lack of an ad hoc satellite-based analysis in this region. Recent advances in remote sensing capabilities from the Soil Moisture and Ocean Salinity (SMOS) satellite mission offer unprecedented coverage and spatiotemporal resolution of Sea Surface Salinity (SSS) in the GG. Using SMOS SSS and available in situ measurements, the seasonal variability of freshwater plumes and associated physical mechanisms controlling their seasonal cycle are presented and analyzed. Freshwater plumes in the GG follow two dynamical regimes. They present maximum offshore extension during boreal winter and exhibit minimum signature during summer. In the northeastern GG, SSS variability is mainly explained by high precipitation rate and Niger River runoff during winter, while during late summer, SSS is mainly driven by horizontal advection. In contrast, southeast of GG, freshwater plumes are mainly supplied by Congo River runoff. From September to March, SSS variability is driven by zonal advection, with a major contribution from Ekman wind-driven currents. During spring-summer, the observed SSS increase is likely explained by entrainment and vertical mixing. SSS budget and freshwater advection processes are discussed in the context of the shallow stratification induced by freshwater. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	freshwater plumes; Gulf of Guinea; rivers runoff; SSS seasonal variability
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186318
作者单位	University of Brest, IRD, CNRS, Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS, UMR 6523), Brest, France; US IMAGO (IRD), Brest, France; LaGEA/ENSTP/UNSTIM, Abomey, Benin; ICMPA-UNESCO Chair/UAC, Cotonou, Benin; LHMC/IRHOB, Cotonou, Benin
推荐引用方式 GB/T 7714	Houndegnonto O.J.,Kolodziejczyk N.,Maes C.,et al. Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements[J],2021,126(5).
APA	Houndegnonto O.J.,Kolodziejczyk N.,Maes C.,Bourlès B.,Da-Allada C.Y.,&Reul N..(2021).Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements.Journal of Geophysical Research: Oceans,126(5).
MLA	Houndegnonto O.J.,et al."Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements".Journal of Geophysical Research: Oceans 126.5(2021).