气候变化领域集成服务门户(CCPortal): Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica

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DOI	10.5194/tc-15-1697-2021
	Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica
	Kusahara K.; Hirano D.; Fujii M.; D. Fraser A.; Tamura T.
发表日期	2021
ISSN	19940416
起始页码	1697
结束页码	1717
卷号	15 期号:4
英文摘要	Basal melting of Antarctic ice shelves accounts for more than half of the mass loss from the Antarctic ice sheet. Many studies have focused on active basal melting at ice shelves in the Amundsen-Bellingshausen seas and the Totten ice shelf, East Antarctica. In these regions, the intrusion of Circumpolar Deep Water (CDW) onto the continental shelf is a key component for the localized intensive basal melting. Both regions have a common oceanographic feature: southward deflection of the Antarctic Circumpolar Current brings CDW toward the continental shelves. The physical setting of the Shirase Glacier tongue (SGT) in Lützow-Holm Bay corresponds to a similar configuration on the southeastern side of the Weddell Gyre in the Atlantic sector. Here, we conduct a 2-3 km resolution simulation of an ocean-sea ice-ice shelf model using a recently compiled bottom-topography dataset in the bay. The model can reproduce the observed CDW intrusion along the deep trough. The modeled SGT basal melting reaches a peak in summer and a minimum in autumn and winter, consistent with the wind-driven seasonality of the CDW thickness in the bay. The model results suggest the existence of an eastward-flowing undercurrent on the upper continental slope in summer, and the undercurrent contributes to the seasonal-to-interannual variability in the warm water intrusion into the bay. Furthermore, numerical experiments with and without fast-ice cover in the bay demonstrate that fast ice plays a role as an effective thermal insulator and reduces local sea ice formation, resulting in much warmer water intrusion into the SGT cavity.. © 2021 American Institute of Physics Inc.. All rights reserved.
英文关键词	annual variation; basal melting; continental shelf; continental slope; cryosphere; ice sheet; ice shelf; ice-ocean interaction; modeling; sea ice; seasonal variation; seasonality; Antarctic Ice Sheet; Antarctica; Atlantic Ocean; East Antarctica; Lutzow-Holm Bay
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202354
作者单位	Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Kanagawa, 236-0001, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, 060-0819, Japan; Arctic Research Center, Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan; National Institute of Polar Research, Tachikawa, Tokyo, 190-8518, Japan; Graduate University for Advanced Studies (SOKENDAI), Tachikawa, Tokyo, 190-8518, Japan; Australian Antarctic Program Partnership, University of Tasmania, Hobart, TAS 7004, Australia
推荐引用方式 GB/T 7714	Kusahara K.,Hirano D.,Fujii M.,et al. Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica[J],2021,15(4).
APA	Kusahara K.,Hirano D.,Fujii M.,D. Fraser A.,&Tamura T..(2021).Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica.Cryosphere,15(4).
MLA	Kusahara K.,et al."Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica".Cryosphere 15.4(2021).