气候变化领域集成服务门户(CCPortal): Greenland Ice Mapping Project: Ice flow velocity variation at sub-monthly to decadal timescales

CCPortal

DOI	10.5194/tc-12-2211-2018
	Greenland Ice Mapping Project: Ice flow velocity variation at sub-monthly to decadal timescales
	Joughin I.; Smith B.E.; Howat I.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	We describe several new ice velocity maps produced by the Greenland Ice Mapping Project (GIMP) using Landsat 8 and Copernicus Sentinel 1A/B data. We then focus on several sites where we analyse these data in conjunction with earlier data from this project, which extend back to the year 2000. At Jakobshavn Isbræ and Køge Bugt, we find good agreement when comparing results from different sensors. In a change from recent behaviour, Jakobshavn Isbræ began slowing substantially in 2017, with a midsummer peak that was even slower than some previous winter minima. Over the last decade, we identify two major slowdown events at Køge Bugt that coincide with short-term advances of the terminus. We also examined populations of glaciers in north-west and south-west Greenland to produce a record of speed-up since 2000. Collectively these glaciers continue to speed up, but there are regional differences in the timing of periods of peak speed-up. In addition, we computed trends in winter flow speed for much of the south-west margin of the ice sheet and find little in the way of statistically significant changes over the period covered by our data. Finally, although the consistency of the data is generally good over time and across sensors, our analysis indicates that substantial differences can arise in regions with high strain rates (e.g. shear margins) where sensor resolution can become a factor. For applications such as constraining model inversions, users should factor in the impact that the data's resolution has on their results. © 2018 Author(s).
学科领域	computer simulation; decadal variation; flow velocity; ice flow; ice sheet; Landsat; mapping; peak flow; satellite data; Sentinel; winter; Arctic; Denmark; Greenland; Jakobshavn Glacier; Koge Bay
语种	英语
scopus关键词	computer simulation; decadal variation; flow velocity; ice flow; ice sheet; Landsat; mapping; peak flow; satellite data; Sentinel; winter; Arctic; Denmark; Greenland; Jakobshavn Glacier; Koge Bay
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/119109
作者单位	Polar Science Center, Applied Physics Lab, University of Washington, 1013 NE 40th St., Seattle, WA 98105-6698, United States; Byrd Polar and Climate Research Center, Ohio State University, 1090 Carmack Road, Columbus, OH 43210, United States
推荐引用方式 GB/T 7714	Joughin I.,Smith B.E.,Howat I.. Greenland Ice Mapping Project: Ice flow velocity variation at sub-monthly to decadal timescales[J],2018,12(7).
APA	Joughin I.,Smith B.E.,&Howat I..(2018).Greenland Ice Mapping Project: Ice flow velocity variation at sub-monthly to decadal timescales.Cryosphere,12(7).
MLA	Joughin I.,et al."Greenland Ice Mapping Project: Ice flow velocity variation at sub-monthly to decadal timescales".Cryosphere 12.7(2018).