气候变化领域集成服务门户(CCPortal): Totten Glacier subglacial hydrology determined from geophysics and modeling

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DOI	10.1016/j.epsl.2019.115961
	Totten Glacier subglacial hydrology determined from geophysics and modeling
	Dow C.F.; McCormack F.S.; Young D.A.; Greenbaum J.S.; Roberts J.L.; Blankenship D.D.
发表日期	2020
ISSN	0012821X
卷号	531
英文摘要	Aurora Subglacial Basin (ASB), which feeds Totten Glacier, is a marine basin lying below sea level and contains up to 3.5 m of global sea level equivalent. Rates of future sea level rise from this area are primarily dependent on the stability of Totten Ice Shelf and the controls on ice flow dynamics upstream of the grounding line, both of which may be influenced by subglacial hydrology. We apply the GlaDS subglacial hydrology model to ASB to examine whether the spatial patterns of distributed and efficient drainage systems impact the dynamics of Totten Glacier. We determine the most appropriate model configuration from our series of sensitivity tests by comparing the modeled basal water pressure and water depth results with specularity content data. Those data are derived from ICECAP radar surveys over the same region and represent regions of basal water accumulation. The best match between simulated basal hydrology properties and specularity content shows a strong correspondence in regions of distributed water in the ASB troughs for both water depth and water pressure, but weak correspondence between water depth and specularity content near the grounding line. This may be due to the presence of several large channels draining over the grounding line into the head of Totten Ice Shelf, which are likely not as well represented in the specularity content data as distributed systems. These channels may have a significant impact on melt, and therefore the stability, of Totten Ice Shelf. Within ASB, regions of high water pressure and greater water accumulation correspond well with regions of faster ice flow, suggesting some control of basal hydrology on ice dynamics in this region. © 2019 Elsevier B.V.
关键词	East Antarctica glacier hydrology ice dynamics Totten Glacier
英文关键词	Dynamics; Hydrology; Ice control; Sea level; Appropriate models; Distributed systems; East antarctica; Glacier hydrology; High water pressure; Ice dynamics; Subglacial hydrology; Water accumulation; Ice
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202568
作者单位	Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada; Institute for Marine and Antarctic Studies, University of Tasmania, Tasmania, Hobart, Australia; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Australian Antarctic Division, Tasmania, Kingston, Australia; Antarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Tasmania, Hobart, Australia
推荐引用方式 GB/T 7714	Dow C.F.,McCormack F.S.,Young D.A.,et al. Totten Glacier subglacial hydrology determined from geophysics and modeling[J],2020,531.
APA	Dow C.F.,McCormack F.S.,Young D.A.,Greenbaum J.S.,Roberts J.L.,&Blankenship D.D..(2020).Totten Glacier subglacial hydrology determined from geophysics and modeling.Earth and Planetary Science Letters,531.
MLA	Dow C.F.,et al."Totten Glacier subglacial hydrology determined from geophysics and modeling".Earth and Planetary Science Letters 531(2020).