气候变化领域集成服务门户(CCPortal): Reduced melt on debris-covered glaciers: Investigations from Changri Nup Glacier, Nepal

CCPortal

DOI	10.5194/tc-10-1845-2016
	Reduced melt on debris-covered glaciers: Investigations from Changri Nup Glacier, Nepal
	Vincent C.; Wagnon P.; Shea J.M.; Immerzeel W.W.; Kraaijenbrink P.; Shrestha D.; Soruco A.; Arnaud Y.; Brun F.; Berthier E.; Sherpa S.F.
发表日期	2016
ISSN	19940416
卷号	10 期号:4
英文摘要	Approximately 25 % of the glacierized area in the Everest region is covered by debris, yet the surface mass balance of debris-covered portions of these glaciers has not been measured directly. In this study, ground-based measurements of surface elevation and ice depth are combined with terrestrial photogrammetry, unmanned aerial vehicle (UAV) and satellite elevation models to derive the surface mass balance of the debris-covered tongue of Changri Nup Glacier, located in the Everest region. Over the debris-covered tongue, the mean elevation change between 2011 and 2015 is -0.93 m year-1 or -0.84 m water equivalent per year (w.e. a-1). The mean emergence velocity over this region, estimated from the total ice flux through a cross section immediately above the debris-covered zone, is +0.37 m w.e. a-1. The debris-covered portion of the glacier thus has an area-averaged mass balance of -1.21 ± 0.2 m w.e. a-1 between 5240 and 5525 m above sea level (m a.s.l.). Surface mass balances observed on nearby debris-free glaciers suggest that the ablation is strongly reduced (by ca. 1.8 m w.e. a-1) by the debris cover. The insulating effect of the debris cover has a larger effect on total mass loss than the enhanced ice ablation due to supraglacial ponds and exposed ice cliffs. This finding contradicts earlier geodetic studies and should be considered for modelling the future evolution of debris-covered glaciers. © 2016 Author(s).
学科领域	debris flow; elevation; emergence; glacier; ice; mass balance; photogrammetry; sea level; unmanned vehicle; velocity; Nepal
语种	英语
scopus关键词	debris flow; elevation; emergence; glacier; ice; mass balance; photogrammetry; sea level; unmanned vehicle; velocity; 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/119598
作者单位	UJF-Grenoble 1, CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), Grenoble, France; IRD/UJF-Grenoble1, Laboratoire d'étude des Transferts en Hydrologie et Environnement (LTHE), Grenoble, France; International Centre for Integrated Mountain Development, Kathmandu, Nepal; Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Nepal Academy of Science and Technology, Kathmandu, Nepal; UMSA, IGEMA, La Paz, Bolivia; LEGOS, CNRS, Université de Toulouse, Toulouse, France; Department of Environmental Science and Engineering, School of Science, Kathmandu University, Dulikhel, Nepal
推荐引用方式 GB/T 7714	Vincent C.,Wagnon P.,Shea J.M.,et al. Reduced melt on debris-covered glaciers: Investigations from Changri Nup Glacier, Nepal[J],2016,10(4).
APA	Vincent C..,Wagnon P..,Shea J.M..,Immerzeel W.W..,Kraaijenbrink P..,...&Sherpa S.F..(2016).Reduced melt on debris-covered glaciers: Investigations from Changri Nup Glacier, Nepal.Cryosphere,10(4).
MLA	Vincent C.,et al."Reduced melt on debris-covered glaciers: Investigations from Changri Nup Glacier, Nepal".Cryosphere 10.4(2016).