气候变化领域集成服务门户(CCPortal): Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet

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DOI	10.1073/pnas.1405184111
	Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet
	Schroeder D.M.; Blankenship D.D.; Young D.A.; Quartini E.
发表日期	2014
ISSN	0027-8424
起始页码	9070
结束页码	9072
卷号	111 期号:25
英文摘要	Heterogeneous hydrologic, lithologic, and geologic basal boundary conditions can exert strong control on the evolution, stability, and sea level contribution of marine ice sheets. Geothermal flux is one of the most dynamically critical ice sheet boundary conditions but is extremely difficult to constrain at the scale required to understand and predict the behavior of rapidly changing glaciers. This lack of observational constraint on geothermal flux is particularly problematic for the glacier catchments of the West Antarctic Ice Sheet within the low topography of the West Antarctic Rift System where geothermal fluxes are expected to be high, heterogeneous, and possibly transient. We use airborne radar sounding data with a subglacial water routing model to estimate the distribution of basal melting and geothermal flux beneath Thwaites Glacier, West Antarctica. We show that the Thwaites Glacier catchment has a minimum average geothermal flux of ∼114 ± 10 mW/ m2 with areas of high flux exceeding 200 mW/m2 consistent with hypothesized rift-associated magmatic migration and volcanism. These areas of highest geothermal flux include the westernmost tributary of Thwaites Glacier adjacent to the subaerial Mount Takahe volcano and the upper reaches of the central tributary near the West Antarctic Ice Sheet Divide ice core drilling site.
英文关键词	Ice-penetrating radar; Subglacial hydrology
语种	英语
scopus关键词	water; Antarctica; article; catchment; glacier; ice sheet; melting point; migration; priority journal; telecommunication; temperature; topography; volcano; water cycle
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158918
作者单位	Schroeder, D.M., Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States; Blankenship, D.D., Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States; Young, D.A., Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States; Quartini, E., Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States
推荐引用方式 GB/T 7714	Schroeder D.M.,Blankenship D.D.,Young D.A.,et al. Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet[J],2014,111(25).
APA	Schroeder D.M.,Blankenship D.D.,Young D.A.,&Quartini E..(2014).Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet.Proceedings of the National Academy of Sciences of the United States of America,111(25).
MLA	Schroeder D.M.,et al."Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet".Proceedings of the National Academy of Sciences of the United States of America 111.25(2014).