| DOI: | 10.5194/tc-8-877-2014
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| Scopus记录号: | 2-s2.0-84900864389
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| 论文题名: | Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability |
| 作者: | Cochran J; R; , Jacobs S; S; , Tinto K; J; , Bell R; E
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2014
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| 卷: | 8, 期:3 | | 起始页码: | 877
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| 结束页码: | 889
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| 语种: | 英语
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| 英文关键词: | bathymetry
; climate effect
; ice sheet
; ice shelf
; ice thickness
; mass balance
; meltwater
; thermocline
; Antarctica
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| 英文摘要: | Ice shelves play key roles in stabilizing Antarctica's ice sheets, maintaining its high albedo and returning freshwater to the Southern Ocean. Improved data sets of ice shelf draft and underlying bathymetry are important for assessing ocean-ice interactions and modeling ice response to climate change. The long, narrow Abbot Ice Shelf south of Thurston Island produces a large volume of meltwater, but is close to being in overall mass balance. Here we invert NASA Operation IceBridge (OIB) airborne gravity data over the Abbot region to obtain sub-ice bathymetry, and combine OIB elevation and ice thickness measurements to estimate ice draft. A series of asymmetric fault-bounded basins formed during rifting of Zealandia from Antarctica underlie the Abbot Ice Shelf west of 94° W and the Cosgrove Ice Shelf to the south. Sub-ice water column depths along OIB flight lines are sufficiently deep to allow warm deep and thermocline waters observed near the western Abbot ice front to circulate through much of the ice shelf cavity. An average ice shelf draft of ∼200 m, 15% less than the Bedmap2 compilation, coincides with the summer transition between the ocean surface mixed layer and upper thermocline. Thick ice streams feeding the Abbot cross relatively stable grounding lines and are rapidly thinned by the warmest inflow. While the ice shelf is presently in equilibrium, the overall correspondence between draft distribution and thermocline depth indicates sensitivity to changes in characteristics of the ocean surface and deep waters. © 2014 Author(s). |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/74848
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
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| Recommended Citation: | |
Cochran J,R,, Jacobs S,et al. Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability[J]. Cryosphere,2014-01-01,8(3)
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