气候变化领域集成服务门户(CCPortal): Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability

CCPortal

DOI	10.5194/tc-8-877-2014
	Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability
	Cochran J.R.; Jacobs S.S.; Tinto K.J.; Bell R.E.
发表日期	2014
ISSN	19940416
卷号	8 期号:3
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).
学科领域	bathymetry; climate effect; ice sheet; ice shelf; ice thickness; mass balance; meltwater; thermocline; Antarctica
语种	英语
scopus关键词	bathymetry; climate effect; ice sheet; ice shelf; ice thickness; mass balance; meltwater; thermocline; Antarctica
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/120113
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
推荐引用方式 GB/T 7714	Cochran J.R.,Jacobs S.S.,Tinto K.J.,et al. Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability[J],2014,8(3).
APA	Cochran J.R.,Jacobs S.S.,Tinto K.J.,&Bell R.E..(2014).Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability.Cryosphere,8(3).
MLA	Cochran J.R.,et al."Bathymetric and oceanic controls on Abbot Ice Shelf thickness and stability".Cryosphere 8.3(2014).