气候变化领域集成服务门户(CCPortal): Erosion of the Subsurface Salinity Maximum of the Loop Current Eddies From Glider Observations and a Numerical Model

CCPortal

DOI	10.1029/2019JC015397
	Erosion of the Subsurface Salinity Maximum of the Loop Current Eddies From Glider Observations and a Numerical Model
	Sosa-Gutiérrez R.; Pallàs-Sanz E.; Jouanno J.; Chaigneau A.; Candela J.; Tenreiro M.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	The erosion of the subsurface salinity maximum, signature of the Caribbean Subtropical UnderWater (SUW), within the Loop Current Eddy (LCE) Poseidon (August 2016 to July 2017) in the Gulf of Mexico (GoM) and the formation of the Gulf Common Water (GCW) during its journey westward, was observed using glider data. Most of the dilution of the SUW high-salinity core within Poseidon occurs during late autumn and winter associated with Northern winds and mixed-layer deepening. The physical processes that contribute to salt dilution of the SUW inside the LCEs' core are investigated using a numerical regional model. The analysis of the salt budget in a long-lasting numerical LCE and a composite analysis of sixteen LCEs reveal that the salinity trend is mostly explained by the vertical salinity diffusion. Cold and dry Northern winds during the first winter drive strong negative net heat fluxes that trigger turbulent flux of salt into the LCEs' thermostad and dilution of the SUW high-salinity core below. The vertical salinity diffusion continues homogenizing the salinity in the upper ocean until the vertical gradient of salinity is negligible. As a result, SUW is transformed to precursor of GCW that is ultimately diffused to surrounding waters in the western GoM. Although the contribution of advection to the salinity trend above the isopycnal of 1,026 kg m−3 is of second order, below is the most important process driving loss of salinity, presumably due to, eddy-eddy interactions during LCEs' westward propagation and eddy pumping (upwelling) during the LCEs' decaying phase along the western slope. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Caribbean Subtropical UnderWater; Loop Current Eddies; negative net heat fluxes; Northern winds; salt budget; vertical salinity diffusion
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/186787
作者单位	Departamento de Oceanografía Física, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico; Laboratoire d'Études en Géophysique et Océanographie Spatiale (LEGOS), Université de Toulouse, CNES, CNRD, IRD, UPS, Toulouse, France; Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB), Cotonou, Benin; International Chair in Mathematical Physics and Applications (ICMPAâUNESCO Chair), University of Abomey-Calavi, Cotonou, Benin
推荐引用方式 GB/T 7714	Sosa-Gutiérrez R.,Pallàs-Sanz E.,Jouanno J.,et al. Erosion of the Subsurface Salinity Maximum of the Loop Current Eddies From Glider Observations and a Numerical Model[J],2020,125(7).
APA	Sosa-Gutiérrez R.,Pallàs-Sanz E.,Jouanno J.,Chaigneau A.,Candela J.,&Tenreiro M..(2020).Erosion of the Subsurface Salinity Maximum of the Loop Current Eddies From Glider Observations and a Numerical Model.Journal of Geophysical Research: Oceans,125(7).
MLA	Sosa-Gutiérrez R.,et al."Erosion of the Subsurface Salinity Maximum of the Loop Current Eddies From Glider Observations and a Numerical Model".Journal of Geophysical Research: Oceans 125.7(2020).