DOI: 10.5194/tc-12-1387-2018
Scopus记录号: 2-s2.0-85045543137
论文题名: Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry
作者: Xie S ; , Dixon T ; H ; , Voytenko D ; , Deng F ; , Holland D ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 4 起始页码: 1387
结束页码: 1400
语种: 英语
英文关键词: digital elevation model
; floating ice
; glacier retreat
; ice flow
; interferometer
; radar interferometry
; sea level
; tidal current
; topography
; Arctic
; Greenland
; Jakobshavn Glacier
英文摘要: Ice velocity variations near the terminus of Jakobshavn Isbræ, Greenland, were observed with a terrestrial radar interferometer (TRI) during three summer campaigns in 2012, 2015, and 2016. We estimate a ∼1 km wide floating zone near the calving front in early summer of 2015 and 2016, where ice moves in phase with ocean tides. Digital elevation models (DEMs) generated by the TRI show that the glacier front here was much thinner (within 1 km of the glacier front, average ice surface is ∼100 and ∼110m above local sea level in 2015 and 2016, respectively) than ice upstream (average ice surface is >150m above local sea level at 2-3 km to the glacier front in 2015 and 2016). However, in late summer 2012, there is no evidence of a floating ice tongue in the TRI observations. Average ice surface elevation near the glacier front was also higher, ∼125m above local sea level within 1 km of the glacier front. We hypothesize that during Jakobshavn Isbræ's recent calving seasons the ice front advances ∼3 km from winter to spring, forming a >1 km long floating ice tongue. During the subsequent calving season in mid- and late summer, the glacier retreats by losing its floating portion through a sequence of calving events. By late summer, the entire glacier is likely grounded. In addition to ice velocity variation driven by tides, we also observed a velocity variation in the mélange and floating ice front that is non-parallel to long-term ice flow motion. This cross-flow-line signal is in phase with the first time derivative of tidal height and is likely associated with tidal currents or bed topography. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75374
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: School of Geosciences, University of South Florida, Tampa, FL, United States; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Center for Global Sea Level Change, New York University, Abu Dhabi, United Arab Emirates
Recommended Citation:
Xie S,, Dixon T,H,et al. Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry[J]. Cryosphere,2018-01-01,12(4)