DOI: 10.5194/tc-15-1697-2021
论文题名: Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica
作者: Kusahara K. ; Hirano D. ; Fujii M. ; D. Fraser A. ; Tamura T.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 4 起始页码: 1697
结束页码: 1717
语种: 英语
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164732
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Kusahara K.,Hirano D.,Fujii M.,et al. Modeling intensive ocean-cryosphere interactions in Lützow-Holm Bay, East Antarctica[J]. Cryosphere,2021-01-01,15(4)