气候变化领域集成服务门户(CCPortal): Coherent Seasonal Acceleration of the Weddell Sea Boundary Current System Driven by Upstream Winds

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DOI	10.1029/2020JC016316
	Coherent Seasonal Acceleration of the Weddell Sea Boundary Current System Driven by Upstream Winds
	Le Paih N.; Hattermann T.; Boebel O.; Kanzow T.; Lüpkes C.; Rohardt G.; Strass V.; Herbette S.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	The Weddell Sea is of global importance in the formation of dense bottom waters associated with sea ice formation and ocean-ice sheet interaction occurring on the shelf areas. In this context, the Weddell Sea boundary current system (BCS) presents a major conduit for transporting relatively warm water to the Weddell Sea ice shelves and for exporting some modified form of Wedell Sea deep and bottom waters into the open ocean. This study investigates the downstream evolution of the structure and the seasonality of the BCS along the Weddell Sea continental slope, combining ocean data collected for the past two decades at three study locations. The interannual-mean geostrophic flow, which follows planetary potential vorticity contours, shifts from being surface intensified to bottom intensified along stream. The shift occurs due to the densification of water masses and the decreasing surface stress that occurs westward, toward the Antarctic Peninsula. A coherent along-slope seasonal acceleration of the barotropic flow exists, with maximum speed in austral autumn and minimum speed in austral summer. The barotropic flow significantly contributes to the seasonal variability in bottom velocity along the tip of the Antarctic Peninsula. Our analysis suggests that the winds on the eastern/northeastern side of the gyre determines the seasonal acceleration of the barotropic flow. In turn, they might control the export of Weddell Sea Bottom Water on seasonal time scales. The processes controlling the baroclinic seasonality of the flow need further investigation. ©2020. The Authors.
英文关键词	Antarctic slope current; flow strength; Southern Ocean; surface stress; teleconnection; Weddell Sea
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/186619
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Norwegian Polar Institute, Tromsø, Norway; Faculty of Physics/Electrical Engineering (FB 01) \| Department of Geosciences (FB5), University of Bremen, Bremen, Germany; Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Univ. Brest, CNRS, IRD, Ifremer, Brest, France
推荐引用方式 GB/T 7714	Le Paih N.,Hattermann T.,Boebel O.,et al. Coherent Seasonal Acceleration of the Weddell Sea Boundary Current System Driven by Upstream Winds[J],2020,125(10).
APA	Le Paih N..,Hattermann T..,Boebel O..,Kanzow T..,Lüpkes C..,...&Herbette S..(2020).Coherent Seasonal Acceleration of the Weddell Sea Boundary Current System Driven by Upstream Winds.Journal of Geophysical Research: Oceans,125(10).
MLA	Le Paih N.,et al."Coherent Seasonal Acceleration of the Weddell Sea Boundary Current System Driven by Upstream Winds".Journal of Geophysical Research: Oceans 125.10(2020).