globalchange  > 科学计划与规划
DOI: 10.1002/2016GL070259
论文题名:
Grounding line variability and subglacial lake drainage on Pine Island Glacier, Antarctica
作者: Joughin I.; Shean D.E.; Smith B.E.; Dutrieux P.
刊名: Geophysical Research Letters
ISSN: 0094-8699
EISSN: 1944-8430
出版年: 2016
卷: 43, 期:17
起始页码: 9093
结束页码: 9102
语种: 英语
英文关键词: Pine Island Glacier
Scopus关键词: Flow of water ; Glaciers ; Lakes ; Digital elevation model ; Horizontal flows ; Intermittent-contacts ; Island ; Pine ; Pine island glaciers ; Speckle tracking ; Subglacial waters ; Parallel flow ; bathymetry ; digital elevation model ; displacement ; drainage ; grounding line ; lake ; speckle ; subglacial environment ; subsidence ; TerraSAR-X ; tidal range ; uplift ; water flow ; Antarctica ; Pine Island Glacier ; West Antarctica
英文摘要: We produced a 6 year time series of differential tidal displacement for Pine Island Ice Shelf, Antarctica, using speckle-tracking methods applied to fine-resolution TerraSAR-X data. These results reveal that the main grounding line has maintained a relatively steady position over the last 6 years, following the speedup that terminated in ~2009. In the middle of the shelf, there are grounded spots that migrate downstream over the 6 year record. Examination of high-resolution digital elevation models reveals that these grounded spots form where deep keels (thickness anomalies) advect over an approximately flow-parallel bathymetric high, maintaining intermittent contact with the bed. These data sets also reveal several subsidence and uplift events associated with subglacial lake drainages in the fast-flowing region above the grounding line. Although these drainages approximately double the rate of subglacial water flow over periods of a few weeks, they have no discernible effect on horizontal flow speed. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987981823&doi=10.1002%2f2016GL070259&partnerID=40&md5=e1b03da675de609fc2a16f292d6844b0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9662
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: Polar Science Center, Applied Physics Lab, University of Washington, Seattle, WA, United States

Recommended Citation:
Joughin I.,Shean D.E.,Smith B.E.,et al. Grounding line variability and subglacial lake drainage on Pine Island Glacier, Antarctica[J]. Geophysical Research Letters,2016-01-01,43(17).
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