气候变化领域集成服务门户(CCPortal): Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations

CCPortal

DOI	10.1029/2020JC016751
	Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations
	Majumder S.; Castelao R.M.; Amos C.M.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	The Greenland ice sheet is melting at increasing rates. Changes in freshwater input to the Labrador Sea can influence coastal circulation and biological processes, stratification, and potentially winter convection. Many recent studies have investigated freshwater variability in the region based on model simulations or observations with limited spatial/temporal coverage. Here, we use in situ (1990–2019) and satellite (2011–2017) observations of surface salinity to characterize freshwater content and to identify transport pathways in the Labrador Sea over multiple years. Large freshening is observed in coastal waters off southwest Greenland from July to November. Interannual variability in freshening near the coast seems to be at least partially related to variability in meltwater input, although the sparseness of in situ data precludes a quantitative assessment. The seasonal westward transport of freshwater is enhanced between 60°–62°N and especially between 63°–64.8°N from August to October, with the low-salinity waters circumnavigating the basin following the 1,000–2,000 m isobaths. That pathway coincides with intensifications in the component of the surface geostrophic flow that is directed offshore, highlighting the role played by the large-scale circulation on the westward transport of the freshwater. Low-salinity water can be transported toward the central Labrador Sea at synoptic scales, however, where it can potentially influence stratification. Consistent with previous modeling studies, offshore freshening is reduced in years with persistent downwelling-favorable wind conditions. Despite limitations under cold water conditions, satellite observations of surface salinity compare well with in situ data suggesting that they can be useful for monitoring freshwater content in high latitudes. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	cross-shelf transport; Labrador Sea; meltwater; salinity; SMOS
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/186372
作者单位	Department of Marine Sciences, University of Georgia, Athens, GA, United States
推荐引用方式 GB/T 7714	Majumder S.,Castelao R.M.,Amos C.M.. Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations[J],2021,126(4).
APA	Majumder S.,Castelao R.M.,&Amos C.M..(2021).Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations.Journal of Geophysical Research: Oceans,126(4).
MLA	Majumder S.,et al."Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations".Journal of Geophysical Research: Oceans 126.4(2021).