气候变化领域集成服务门户(CCPortal): Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry

CCPortal

DOI	10.5194/tc-12-1387-2018
	Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry
	Xie S.; Dixon T.H.; Voytenko D.; Deng F.; Holland D.M.
发表日期	2018
ISSN	19940416
卷号	12 期号:4
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.
学科领域	digital elevation model; floating ice; glacier retreat; ice flow; interferometer; radar interferometry; sea level; tidal current; topography; Arctic; Greenland; Jakobshavn Glacier
语种	英语
scopus关键词	digital elevation model; floating ice; glacier retreat; ice flow; interferometer; radar interferometry; sea level; tidal current; topography; Arctic; Greenland; Jakobshavn Glacier
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119175
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
推荐引用方式 GB/T 7714	Xie S.,Dixon T.H.,Voytenko D.,et al. Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry[J],2018,12(4).
APA	Xie S.,Dixon T.H.,Voytenko D.,Deng F.,&Holland D.M..(2018).Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry.Cryosphere,12(4).
MLA	Xie S.,et al."Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry".Cryosphere 12.4(2018).