| DOI: | 10.1002/2014GL061836
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| 论文题名: | Distinct patterns of seasonal Greenland glacier velocity |
| 作者: | Moon T.; Joughin I.; Smith B.; Van Den Broeke M.R.; Van De Berg W.J.; Noël B.; Usher M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9702
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| EISSN: | 1944-9433
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| 出版年: | 2014
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| 卷: | 41, 期:20 | | 起始页码: | 7209
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| 结束页码: | 7216
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| 语种: | 英语
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| 英文关键词: | Greenland
; interferometric synthetic aperture radar
; meltwater
; seasonal velocity
; subglacial drainage
; terminus
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| Scopus关键词: | Aquifers
; Glaciers
; Hydrogeology
; Ice control
; Synthetic aperture radar
; Velocity
; Velocity measurement
; Control mechanism
; Greenland
; Greenland Ice Sheet
; Interferometric synthetic aperture radars
; meltwater
; Subglacial meltwater
; terminus
; Velocity fluctuations
; Ice
; drainage
; ice sheet
; meltwater
; seasonal variation
; seasonality
; spatiotemporal analysis
; velocity
; Arctic
; Greenland
; Greenland Ice Sheet
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| 英文摘要: | Predicting Greenland Ice Sheet mass loss due to ice dynamics requires a complete understanding of spatiotemporal velocity fluctuations and related control mechanisms. We present a 5-year record of seasonal velocity measurements for 55 marine-terminating glaciers distributed around the ice sheet margin, along with ice-front position and runoff data sets for each glacier. Among glaciers with substantial speed variations, we find three distinct seasonal velocity patterns. One pattern indicates relatively high glacier sensitivity to ice-front position. The other two patterns are more prevalent and appear to be meltwater controlled. These patterns reveal differences in which some subglacial systems likely transition seasonally from inefficient, distributed hydrologic networks to efficient, channelized drainage, while others do not. The difference may be determined by meltwater availability, which in some regions may be influenced by perennial firn aquifers. Our results highlight the need to understand subglacial meltwater availability on an ice sheet-wide scale to predict future dynamic changes. Key Points First multi-region seasonal velocity measurements show regional differencesSeasonal velocity fluctuations on most glaciers appear meltwater controlledSeasonal development of efficient subglacial drainage geographically divided ©2014. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911417711&doi=10.1002%2f2014GL061836&partnerID=40&md5=ab9b1a308d938d7cf56ca1ae53670a4f
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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/6966
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Earth and Space Sciences, University of Washington, Seattle, WA, United States
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| Recommended Citation: | |
Moon T.,Joughin I.,Smith B.,et al. Distinct patterns of seasonal Greenland glacier velocity[J]. Geophysical Research Letters,2014-01-01,41(20).
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