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Variability of Warm Deep Water Inflow in a Submarine Trough on the Amundsen Sea Shelf

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Title
Variability of Warm Deep Water Inflow in a Submarine Trough on the Amundsen Sea Shelf
Other Titles
남극아문젠해 대륙붕 해저계곡으로 유입되는 고온심층수의 변동성
Authors
Anna Wahlin
Lars Arneborg
C. Stranne
Lee, Jae-Hak
Lee, Sang H.
Kim, Tae-Wan
Ha, Ho Kyung
G. Carvajal
Goran Bjork
Ola Karen
Subject
Oceanography
Keywords
Ekman pumping/transport; Seasonal variability; Southern Ocean
Issue Date
2013
Publisher
American
Citation
Anna Wahlin, et al. 2013. "Variability of Warm Deep Water Inflow in a Submarine Trough on the Amundsen Sea Shelf". JOURNAL OF PHYSICAL OCEANOGRAPHY, 43(10): 2054-2070.
Abstract
The ice shelves in the Amundsen Sea are thinning rapidly, and the main reason for their decline appears to be warm ocean currents circulating below the ice shelves and melting these from below. Ocean currents transport warm dense water onto the shelf, channeled by bathymetric troughs leading to the deep inner basins. A hydrographic mooring equipped with an upward-looking ADCP has been placed in one of these troughs on the central Amundsen shelf. The two years (2010/11) of mooring data are here used to characterize the inflow of warm deep water to the deep shelf basins. During both years, the warm layer thickness and temperature peaked in austral fall. The along-trough velocity is dominated by strong fluctuations that do not vary in the vertical. These fluctuations are correlated with the local wind, with eastward wind over the shelf and shelf break giving flow toward the ice shelves. In addition, there is a persistent flow of dense lower Circumpolar Deep Water (CDW) toward the ice shelves in the bottom layer. the shelf, channeled by bathymetric troughs leading to the deep inner basins. A hydrographic mooring equipped with an upward-looking ADCP has been placed in one of these troughs on the central Amundsen shelf. The two years (2010/11) of mooring data are here used to characterize the inflow of warm deep water to the deep shelf basins. During both years, the warm layer thickness and temperature peaked in austral fall. The along-trough velocity is dominated by strong fluctuations that do not vary in the vertical. These fluctuations are correlated with the local wind, with eastward wind over the shelf and shelf break giving flow toward the ice shelves. In addition, there is a persistent flow of dense lower Circumpolar Deep Water (CDW) toward the ice shelves in the bottom layer.
URI
http://repository.kopri.re.kr/handle/201206/6004
DOI
http://dx.doi.org/10.1175/JPO-D-12-0157.1
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