气候变化领域集成服务门户(CCPortal): Formation and Evolution of a Freshwater Plume in the Northwestern Tropical Atlantic in February 2020

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DOI	10.1029/2020JC016981
	Formation and Evolution of a Freshwater Plume in the Northwestern Tropical Atlantic in February 2020
	Reverdin G.; Olivier L.; Foltz G.R.; Speich S.; Karstensen J.; Horstmann J.; Zhang D.; Laxenaire R.; Carton X.; Branger H.; Carrasco R.; Boutin J.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	In February 2020, a 120-km-wide freshwater plume was documented by satellite and in situ observations near the Demerara Rise (7°N/54°W-56°W). It was initially stratified in the upper 10 m with a freshwater content of 2–3 m of Amazon water distributed down to 40 m. On February 2nd, ship transects indicate an inhomogeneous shelf structure with a propagating front in its midst, whereas minimum salinity close to 30 pss was observed close to the shelf break on February 5th. The salinity minimum eroded in time but was still observed 13–16 days later with 33.3 pss minimum value up to 400 km from the shelf break. At this time, the mixed layer depth was close to 20 m. The off-shelf flow lasted 10 days, contributing to a plume area extending over 100,000 km2 and associated with a 0.15 Sv (106 m3 s−1) freshwater transport. The off-shelf plume was steered northward by a North Brazil Current ring up to 12°N and then extended westward toward the Caribbean Sea. Its occurrence followed 3 days of favorable wind direction closer to the Amazon estuary, which contributed to north-westward freshwater transport on the shelf. Other such events of freshwater transport in January–March are documented since 2010 in salinity satellite products in 7 out of 10 years, and in 6 of those years, they were preceded by a change in wind direction between the Amazon estuary and the Guianas favoring the north-westward freshwater transport toward the shelf break. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	drifters; fresh water transport; freshwater plume; research vessel sections; saildrones; satellite salinity; western tropical Atlantic
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/186382
作者单位	LOCEAN-IPSL, Sorbonne Université-CNRS-IRD-MNHN, Paris, France; NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; Laboratoire de Météorologie Dynamique, ENS-Ecole Polytechnique-CNRS-Sorbonne Université, Paris, France; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; CICOES/University of Washington and NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Laboratoire d’Océanographie Physique et Spatiale, UBO-CNRS-IFREMER-IRD, Plouzané, France; IRPHE, CNRS-AMU, Luminy, France
推荐引用方式 GB/T 7714	Reverdin G.,Olivier L.,Foltz G.R.,et al. Formation and Evolution of a Freshwater Plume in the Northwestern Tropical Atlantic in February 2020[J],2021,126(4).
APA	Reverdin G..,Olivier L..,Foltz G.R..,Speich S..,Karstensen J..,...&Boutin J..(2021).Formation and Evolution of a Freshwater Plume in the Northwestern Tropical Atlantic in February 2020.Journal of Geophysical Research: Oceans,126(4).
MLA	Reverdin G.,et al."Formation and Evolution of a Freshwater Plume in the Northwestern Tropical Atlantic in February 2020".Journal of Geophysical Research: Oceans 126.4(2021).