globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2289
论文题名:
Eddy transport as a key component of the Antarctic overturning circulation
作者: Thompson A.F.; Heywood K.J.; Schmidtko S.; Stewart A.L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:12
起始页码: 879
结束页码: 884
语种: 英语
Scopus关键词: eddy ; heat flux ; ice shelf ; overturn ; shelf break ; water mass ; Antarctica
英文摘要: The exchange of water masses across the Antarctic continental shelf break regulates the export of dense shelf waters to depth as well as the transport of warm, mid-depth waters towards ice shelves and glacial grounding lines. The penetration of the warmer mid-depth waters past the shelf break has been implicated in the pronounced loss of ice shelf mass over much of west Antarctica. In high-resolution, regional circulation models, the Antarctic shelf break hosts an energetic mesoscale eddy field, but observations that capture this mesoscale variability have been limited. Here we show, using hydrographic data collected from ocean gliders, that eddy-induced transport is a primary contributor to mass and property fluxes across the slope. Measurements along ten cross-shelf hydrographic sections show a complex velocity structure and a stratification consistent with an onshore eddy mass flux. We show that the eddy transport and the surface wind-driven transport make comparable contributions to the total overturning circulation. Eddy-induced transport is concentrated in the warm, intermediate layers away from frictional boundaries. We conclude that understanding mesoscale dynamics will be critical for constraining circumpolar heat fluxes and future rates of retreat of Antarctic ice shelves. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106556
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Environmental Science and Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA, United States; School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom; GEOMAR, Helmholtz Center for Ocean Research, Düsternbrooker Weg 20, Kiel, Germany; Los Angeles Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States

Recommended Citation:
Thompson A.F.,Heywood K.J.,Schmidtko S.,et al. Eddy transport as a key component of the Antarctic overturning circulation[J]. Nature Geoscience,2014-01-01,7(12)
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