气候变化领域集成服务门户(CCPortal): Direct and Indirect Pathways of Convected Water Masses and Their impacts on the Overturning Dynamics of the Labrador Sea

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DOI	10.1029/2020JC016654
	Direct and Indirect Pathways of Convected Water Masses and Their impacts on the Overturning Dynamics of the Labrador Sea
	Georgiou S.; Ypma S.L.; Brüggemann N.; Sayol J.-M.; van der Boog C.G.; Spence P.; Pietrzak J.D.; Katsman C.A.
发表日期	2021
ISSN	21699275
卷号	126 期号:1
英文摘要	The dense waters formed by wintertime convection in the Labrador Sea play a key role in setting the properties of the deep Atlantic Ocean. To understand how variability in their production might affect the Atlantic Meridional Overturning Circulation (AMOC) variability, it is essential to determine pathways and associated timescales of their export. In this study, we analyze the trajectories of Argo floats and of Lagrangian particles launched at 53°N in the boundary current and traced backward in time in a high-resolution model, to identify and quantify the importance of upstream pathways. We find that 85% of the transport carried by the particles at 53°N originates from Cape Farewell, and it is split between a direct route that follows the boundary current and an indirect route involving boundary-interior exchanges. Although both routes contribute roughly equally to the maximum overturning, the indirect route governs its signal in denser layers. This indirect route has two branches: part of the convected water is exported rapidly on the Labrador side of the basin and part follows a longer route toward Greenland and is then carried with the boundary current. Export timescales of these two branches typically differ by 2.5 years. This study thus shows that boundary-interior exchanges are important for the pathways and the properties of water masses arriving at 53°N. It reveals a complex three-dimensional view of the convected water export, with implications for the arrival time of signals of variability therein at 53°N and thus for our understanding of the AMOC. © 2020. The Authors.
英文关键词	AMOC; boundary-interior exchanges; Labrador Sea; Lagrangian pathways
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/186512
作者单位	Section of Environmental Fluid Mechanics, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, Hamburg, Germany; Department of Applied Mathematics, University of Alicante, Sant Vicent del Raspeig, Alicante, Spain; School of Geosciences, University of Sydney, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Georgiou S.,Ypma S.L.,Brüggemann N.,et al. Direct and Indirect Pathways of Convected Water Masses and Their impacts on the Overturning Dynamics of the Labrador Sea[J],2021,126(1).
APA	Georgiou S..,Ypma S.L..,Brüggemann N..,Sayol J.-M..,van der Boog C.G..,...&Katsman C.A..(2021).Direct and Indirect Pathways of Convected Water Masses and Their impacts on the Overturning Dynamics of the Labrador Sea.Journal of Geophysical Research: Oceans,126(1).
MLA	Georgiou S.,et al."Direct and Indirect Pathways of Convected Water Masses and Their impacts on the Overturning Dynamics of the Labrador Sea".Journal of Geophysical Research: Oceans 126.1(2021).