期刊
JOURNAL OF GLACIOLOGY
卷 65, 期 249, 页码 39-54出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jog.2018.90
关键词
calving; dynamic thinning; Jakobshavn Isbrae; terrestrial radar interferometry; tidewater glaciers
资金
- Gordon and Betty Moore Foundation [GBMF2627]
- NASA [NNX08AN74G]
- New Hampshire Space Grant Consortium [NNX10AL97H]
- NASA Earth and Space Science Fellowship Program [NNX14AL29H]
- NASA [NNX08AN74G, 95379, NNX14AL29H, 680428] Funding Source: Federal RePORTER
Jakobshavn Isbrae, a tidewater glacier that produces some of Greenland's largest icebergs and highest speeds, reached record-high flow rates in 2012 (Joughin and others, 2014). We use terrestrial radar interferometric observations from August 2012 to characterize the events that led to record-high flow. We find that the highest speeds occurred in response to a small calving retreat, while several larger calving events produced negligible changes in glacier speed. This non-linear response to calving events suggests the terminus was close to flotation and therefore highly sensitive to terminus position. Our observations indicate that a glacier's response to calving is a consequence of two competing feedbacks: (1) an increase in strain rates that leads to dynamic thinning and faster flow, thereby promoting destabilization, and (2) an increase in flow rates that advects thick ice toward the terminus and promotes restabilization. The competition between these feedbacks depends on temporal and spatial variations in the glacier's proximity to flotation. This study highlights the importance of dynamic thinning and advective processes on tidewater glacier stability, and further suggests the latter may be limiting the current retreat due to the thick ice that occupies Jakobshavn Isbae's retrograde bed.
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