气候变化领域集成服务门户(CCPortal): New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations

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DOI	10.5194/tc-14-2869-2020
	New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations
	Jordan T.A.; Porter D.; Tinto K.; Millan R.; Muto A.; Hogan K.; Larter R.D.; Graham A.G.C.; Paden J.D.
发表日期	2020
ISSN	19940416
起始页码	2869
结束页码	2882
卷号	14 期号:9
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.
英文关键词	bathymetry; glacier; gravity; ice sheet; ice shelf; long-term change; observational method; radar; Antarctica; Thwaites Glacier; West Antarctica
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/202117
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
推荐引用方式 GB/T 7714	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],2020,14(9).
APA	Jordan T.A..,Porter D..,Tinto K..,Millan R..,Muto A..,...&Paden J.D..(2020).New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations.Cryosphere,14(9).
MLA	Jordan T.A.,et al."New gravity-derived bathymetry for the Thwaites, Crosson, and Dotson ice shelves revealing two ice shelf populations".Cryosphere 14.9(2020).