DOI: 10.1016/j.epsl.2019.115961
论文题名: Totten Glacier subglacial hydrology determined from geophysics and modeling
作者: Dow C.F. ; McCormack F.S. ; Young D.A. ; Greenbaum J.S. ; Roberts J.L. ; Blankenship D.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164946
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Dow C.F.,McCormack F.S.,Young D.A.,et al. Totten Glacier subglacial hydrology determined from geophysics and modeling[J]. Earth and Planetary Science Letters,2020-01-01,531