globalchange  > 气候变化与战略
DOI: 10.5194/tc-14-2869-2020
论文题名:
New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations
作者: Jordan T.A.; Porter D.; Tinto K.; Millan R.; Muto A.; Hogan K.; Larter R.D.; Graham A.G.C.; Paden J.D.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期:9
起始页码: 2869
结束页码: 2882
语种: 英语
英文关键词: bathymetry ; glacier ; gravity ; ice sheet ; ice shelf ; long-term change ; observational method ; radar ; Antarctica ; Thwaites Glacier ; West Antarctica
英文摘要: Ice shelves play a critical role in the long-term stability of ice sheets through their buttressing effect. The underlying bathymetry and cavity thickness are key inputs for modelling future ice sheet evolution. However, direct observation of sub-ice-shelf bathymetry is time-consuming, logistically risky, and in some areas simply not possible. Here we use new compilations of airborne and marine gravity, radar depth sounding, and swath bathymetry to provide new estimates of sub-ice-shelf bathymetry outboard of the rapidly changing West Antarctic Thwaites Glacier and beneath the adjacent Dotson and Crosson ice shelves. This region is of special interest, as the low-lying inland reverse slope of the Thwaites Glacier system makes it vulnerable to marine ice sheet instability, with rapid grounding line retreat observed since 1993 suggesting this process may be underway. Our results confirm a major marine channel >800 m deep extends tens of kilometres to the front of Thwaites Glacier, while the adjacent ice shelves are underlain by more complex bathymetry. Comparison of our new bathymetry with ice shelf draft reveals that ice shelves formed since 1993 comprise a distinct population where the draft conforms closely to the underlying bathymetry, unlike the older ice shelves, which show a more uniform depth of the ice base. This indicates that despite rapid basal melting in some areas, these recently floated parts of the ice shelf are not yet in dynamic equilibrium with their retreated grounding line positions and the underlying ocean system, a factor which must be included in future models of this region's evolution. © Author(s) 2020.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164495
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964-8000, United States; Institut des Géosciences de l'Environnement, Université Grenoble Alpes, Cnrs, Grenoble, 38000, France; Dept. of Earth and Environmental Science, Temple University, Philadelphia, PA 19122, United States; College of Marine Science, University of South Florida, St Petersburg, FL 33701, United States; Center for Remote Sensing of Ice Sheets (CReSIS), University of KansasKS 66045, United States

Recommended Citation:
Jordan T.A.,Porter D.,Tinto K.,et al. New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations[J]. Cryosphere,2020-01-01,14(9)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Jordan T.A.]'s Articles
[Porter D.]'s Articles
[Tinto K.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Jordan T.A.]'s Articles
[Porter D.]'s Articles
[Tinto K.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Jordan T.A.]‘s Articles
[Porter D.]‘s Articles
[Tinto K.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.