气候变化领域集成服务门户(CCPortal): Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya

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DOI	10.5194/tc-12-3439-2018
	Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya
	Brun F.; Wagnon P.; Berthier E.; Shea J.M.; Immerzeel W.W.; Kraaijenbrink P.D.A.; Vincent C.; Reverchon C.; Shrestha D.; Arnaud Y.
发表日期	2018
ISSN	19940416
卷号	12 期号:11
英文摘要	Ice cliff backwasting on debris-covered glaciers is recognized as an important mass-loss process that is potentially responsible for the debris-cover anomaly, i.e. the fact that debris-covered and debris-free glacier tongues appear to have similar thinning rates in the Himalaya. In this study, we quantify the total contribution of ice cliff backwasting to the net ablation of the tongue of Changri Nup Glacier, Nepal, between 2015 and 2017. Detailed backwasting and surface thinning rates were obtained from terrestrial photogrammetry collected in November 2015 and 2016, unmanned air vehicle (UAV) surveys conducted in November 2015, 2016 and 2017, and Pléiades tri-stereo imagery obtained in November 2015, 2016 and 2017. UAV-and Pléiades-derived ice cliff volume loss estimates were 3% and 7% less than the value calculated from the reference terrestrial photogrammetry. Ice cliffs cover between 7% and 8% of the total map view area of the Changri Nup tongue. Yet from November 2015 to November 2016 (November 2016 to November 2017), ice cliffs contributed to 23±5% (24±5%) of the total ablation observed on the tongue. Ice cliffs therefore have a net ablation rate 3.1±0.6 (3.0±0.6) times higher than the average glacier tongue surface. However, on Changri Nup Glacier, ice cliffs still cannot compensate for the reduction in ablation due to debris-cover. In addition to cliff enhancement, a combination of reduced ablation and lower emergence velocities could be responsible for the debris-cover anomaly on debris-covered tongues. © 2018 Author(s).
学科领域	ablation; cliff; debris flow; glacial debris; ice; photogrammetry; stereo image; unmanned vehicle; Himalayas; Nepal
语种	英语
scopus关键词	ablation; cliff; debris flow; glacial debris; ice; photogrammetry; stereo image; unmanned vehicle; Himalayas; Nepal
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/119040
作者单位	Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, 38000, France; LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, Toulouse, 31400, France; International Center for Integrated Mountain Development, Kathmandu, Nepal; Center for Hydrology, University of Saskatchewan, Saskatoon, Canada; Geography Program, University of Northern British Columbia, Prince George, Canada; Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Central Department of Hydrology and Meteorology, Tribhuvan University, Kathmandu, Nepal; Invited Contribution by Fanny Brun, EGU Cryospheric Sciences Outstanding Student Poster, United States
推荐引用方式 GB/T 7714	Brun F.,Wagnon P.,Berthier E.,et al. Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya[J],2018,12(11).
APA	Brun F..,Wagnon P..,Berthier E..,Shea J.M..,Immerzeel W.W..,...&Arnaud Y..(2018).Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya.Cryosphere,12(11).
MLA	Brun F.,et al."Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya".Cryosphere 12.11(2018).