| DOI: | 10.1002/2014GL062255
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| 论文题名: | Rapid dynamic activation of a marine-based Arctic ice cap |
| 作者: | McMillan M.; Shepherd A.; Gourmelen N.; Dehecq A.; Leeson A.; Ridout A.; Flament T.; Hogg A.; Gilbert L.; Benham T.; Van Den Broeke M.; Dowdeswell J.A.; Fettweis X.; Noël B.; Strozzi T.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9492
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| EISSN: | 1944-9223
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| 出版年: | 2014
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| 卷: | 41, 期:24 | | 起始页码: | 8902
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| 结束页码: | 8909
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| 语种: | 英语
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| 英文关键词: | altimetry
; Austfonna
; dynamic instability
; ice cap
; InSAR
; mass balance
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| Scopus关键词: | Chemical activation
; Snow
; Altimetry
; Austfonna
; Dynamic instability
; Ice-caps
; InSAR
; Mass balance
; Ice
; altimetry
; dynamic analysis
; ice cap
; instability
; mass balance
; satellite imagery
; synthetic aperture radar
; velocity profile
; Arctic
; Austfonna
; Nordaustlandet
; Svalbard
; Svalbard and Jan Mayen
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| 英文摘要: | We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regime has switched from predominantly slow (~ 101 m/yr) to fast (~ 103 m/yr) flow, and rates of ice thinning have exceeded 25 m/yr. At the time of widespread dynamic activation, parts of the terminus may have been near floatation. Subsequently, the imbalance has propagated 50 km inland to within 8 km of the ice cap summit. Our observations demonstrate the ability of slow-flowing ice to mobilize and quickly transmit the dynamic imbalance inland; a process that we show has initiated rapid ice loss to the ocean and redistribution of ice mass to locations more susceptible to melt, yet which remains poorly understood. Key Points Recent dynamic activation of a formerly slow-flowing marine Arctic ice capImbalance has spread 50 km inland to within 8 km of the ice cap summitIce discharge has increased 45-fold, and thinning rates have exceeded 25 m/yr ©2014. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921844855&doi=10.1002%2f2014GL062255&partnerID=40&md5=010511d9290aa41e02587c98f7406528
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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/6756
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Centre for Polar Observation and Modelling, University of Leeds, Leeds, United Kingdom
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| Recommended Citation: | |
McMillan M.,Shepherd A.,Gourmelen N.,et al. Rapid dynamic activation of a marine-based Arctic ice cap[J]. Geophysical Research Letters,2014-01-01,41(24).
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