气候变化领域集成服务门户(CCPortal): Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry

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DOI	10.5194/tc-11-911-2017
	Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
	Jouvet G.; Weidmann Y.; Seguinot J.; Funk M.; Abe T.; Sakakibara D.; Seddik H.; Sugiyama S.
发表日期	2017
ISSN	19940416
卷号	11 期号:2
英文摘要	In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immediately before and after the initiation of a large fracture, which induced a major calving event. A detailed analysis of the strain rate field allows us to accurately map the path taken by the opening crack. Modelling results reveal (i) that the crack was more than half-thickness deep, filled with water and getting irreversibly deeper when it was captured by the UAV and (ii) that the crack initiated in an area of high horizontal shear caused by a local basal bump immediately behind the current calving front. The asymmetry of the bed at the front explains the systematic calving pattern observed in May and July-August 2015. As a corollary, we infer that the calving front of the Bowdoin Glacier is currently stabilized by this bedrock bump and might enter into an unstable mode and retreat rapidly if the glacier keeps thinning in the coming years. Beyond this outcome, our study demonstrates that the combination of UAV photogrammetry and ice flow modelling is a promising tool to horizontally and vertically track the propagation of fractures responsible for large calving events. © 2017 The Author(s).
学科领域	bedrock; flow modeling; glacier dynamics; ice flow; iceberg calving; orthophoto; photogrammetry; satellite imagery; strain rate; unmanned vehicle; Arctic; Greenland
语种	英语
scopus关键词	bedrock; flow modeling; glacier dynamics; ice flow; iceberg calving; orthophoto; photogrammetry; satellite imagery; strain rate; unmanned vehicle; Arctic; Greenland
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/119415
作者单位	ETHZ, VAW, Zurich, Switzerland; Graduate School of Science, Hokkaido University, Sapporo, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
推荐引用方式 GB/T 7714	Jouvet G.,Weidmann Y.,Seguinot J.,et al. Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry[J],2017,11(2).
APA	Jouvet G..,Weidmann Y..,Seguinot J..,Funk M..,Abe T..,...&Sugiyama S..(2017).Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry.Cryosphere,11(2).
MLA	Jouvet G.,et al."Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry".Cryosphere 11.2(2017).