| DOI: | 10.1002/2015GL064236
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| 论文题名: | Undercutting of marine-terminating glaciers in West Greenland |
| 作者: | Rignot E.; Fenty I.; Xu Y.; Cai C.; Kemp C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9133
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| EISSN: | 1944-8864
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| 出版年: | 2015
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| 卷: | 42, 期:14 | | 起始页码: | 5909
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| 结束页码: | 5917
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| 语种: | 英语
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| 英文关键词: | bathymetry
; Glaciology
; Greenland
; ice-ocean interactions
; multibeam echo sounding
; physical oceanography
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| Scopus关键词: | Bathymetry
; Hydrology
; Ice control
; Oceanography
; Sea ice
; Sea level
; Glaciology
; Greenland
; Ice-ocean interactions
; Multibeams
; Physical oceanography
; Ice
; bathymetry
; echo sounder
; geometry
; glaciology
; hydrological modeling
; iceberg
; mass balance
; numerical model
; physical oceanography
; sea level
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| 英文摘要: | Marine-terminating glaciers control most of Greenland's ice discharge into the ocean, but little is known about the geometry of their frontal regions. Here we use side-looking, multibeam echo sounding observations to reveal that their frontal ice cliffs are grounded deeper below sea level than previously measured and their ice faces are neither vertical nor smooth but often undercut by the ocean and rough. Deep glacier grounding enables contact with subsurface, warm, salty Atlantic waters (AW) which melts ice at rates of meters per day. We detect cavities undercutting the base of the calving faces at the sites of subglacial water (SGW) discharge predicted by a hydrological model. The observed pattern of undercutting is consistent with numerical simulations of ice melt in which buoyant plumes of SGW transport warm AW to the ice faces. Glacier undercutting likely enhances iceberg calving, impacting ice front stability and, in turn, the glacier mass balance. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938998091&doi=10.1002%2f2015GL064236&partnerID=40&md5=6c50e30927d7387335793bc36a3cab6b
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| Citation statistics: |
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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/8749
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Earth System Science, University of California, Irvine, CA, United States
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| Recommended Citation: | |
Rignot E.,Fenty I.,Xu Y.,et al. Undercutting of marine-terminating glaciers in West Greenland[J]. Geophysical Research Letters,2015-01-01,42(14).
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