气候变化领域集成服务门户(CCPortal): Wind-Driven Barotropic Velocity Dynamics on an Antarctic Shelf

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DOI	10.1029/2019JC015771
	Wind-Driven Barotropic Velocity Dynamics on an Antarctic Shelf
	McKee D.C.; Martinson D.G.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Reanalysis surface stress around the Antarctic continent is used to obtain the cross-shelf sea surface height (SSH) gradient from the shallow water equations in the long-wave limit, and the result is compared to the observed barotropic current sampled by current meters on the western Antarctic Peninsula shelf. Similar to the dynamics of SSH, intraseasonal velocity fluctuations (periods 3–100 days) largely consist of a circumpolar-coherent wavenumber zero mode and of barotropic shelf waves; however, an important distinction from previous studies is the importance of second mode barotropic shelf waves in the velocity signal. Fluctuations with period 40–60 days are particularly energetic. This is partly due to strong fluctuations in the wavenumber zero mode at this period, as previously demonstrated in Drake Passage transport, but also due to excitement of the second mode barotropic shelf wave. After diagnosing the wind-driven dynamics, some of their implications for shelf-slope exchange are discussed. Firstly, it is shown that wintertime upwelling of warm water at a coastal canyon head is associated with a coastal SSH drop. Secondly, it is argued that the waves' subtle baroclinicity over the steep continental slope modifies isopycnal depth and affects shelf access to warm water. ©2020. American Geophysical Union. All Rights Reserved.
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/186864
作者单位	Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Now at Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
推荐引用方式 GB/T 7714	McKee D.C.,Martinson D.G.. Wind-Driven Barotropic Velocity Dynamics on an Antarctic Shelf[J],2020,125(5).
APA	McKee D.C.,&Martinson D.G..(2020).Wind-Driven Barotropic Velocity Dynamics on an Antarctic Shelf.Journal of Geophysical Research: Oceans,125(5).
MLA	McKee D.C.,et al."Wind-Driven Barotropic Velocity Dynamics on an Antarctic Shelf".Journal of Geophysical Research: Oceans 125.5(2020).