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Warm Circumpolar Deep Water at the Western Getz Ice Shelf Front, Antarctica

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Title
Warm Circumpolar Deep Water at the Western Getz Ice Shelf Front, Antarctica
Other Titles
남극 갯츠빙붕에서의 고온 남극순환심층수
Authors
Karen Assmann
Elin Darelius
Anna Wahlin
Kim, Tae-Wan
Lee, Sang H.
Keywords
Antarctica; Circumpolar Deep Water; ice shelves
Issue Date
2019
Citation
Karen Assmann, et al. 2019. "Warm Circumpolar Deep Water at the Western Getz Ice Shelf Front, Antarctica". GEOPHYSICAL RESEARCH LETTERS, 46(2): 870-878.
Abstract
The Getz Ice Shelf is one of the largest sources of fresh water from ice shelf basal melt in Antarctica. We present new observations from three moorings west of Siple Island 2016?2018. All moorings show a persistent flow of modified Circumpolar Deep Water toward the western Getz Ice Shelf. Unmodified Circumpolar Deep Water with temperatures up to 1.5 °C reaches the ice shelf front in frequent episodes. These represent the warmest water observed at any ice shelf front in the Amundsen Sea. Mean currents within the warm bottom layer of 18?20 cm/s imply an advection time scale of 7 days from shelf break to ice shelf front. Zonal wind stress at the shelf break affects heat content at the ice shelf front on weekly to monthly time scales. Our 2­year mooring records also evince that upwelling over the shelf break controls thermocline depth on subannual to annual time scales.
URI
http://repository.kopri.re.kr/handle/201206/9969
DOI
http://dx.doi.org/10.1029/2018GL081354
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