Mass balance and morphological evolution of the Dokriani Glacier,central Himalaya,India during 1999–2014

作     者：Purushottam Kumar Garg Jairam Singh Yadav Santosh Kumar Rai Aparna Shukla Purushottam Kumar Garg;Jairam Singh Yadav;Santosh Kumar Rai;Aparna Shukla

作者机构：Indian Institute of Technology IndoreKhandwa RoadSimrolIndore 453552India Wadia Institute of Himalayan Geology33GMS RoadDehradun 248001India Ministry of Earth SciencesPrithvi BhavanLodhi RoadNew Delhi 110003India 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第1期

页      面：255-267页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 0705[理学-地理学] 070501[理学-自然地理学] 0704[理学-天文学] 

基　　金：National Post-Doctoral Fellowship(NPDF)award(PDF/2020/000103)from Department of Science and Technology(DST India) 

主　　题：Glacier mass balance Debris cover Epiglacial morphology Supraglacial channel Dokriani Glacier Central Himalaya 

摘      要：Glaciological mass balance(MB)is considered the most direct,undelayed and unfiltered response of the glaciers to climatic ***,it may inherit errors associated with stake underrepresentation,averaging over the entire glacier and human ***,proper validation of glaciological MB with geodetic MB is highly recommended by the World Glacier Monitoring Service(WGMS).The present study focuses on the Dokriani Glacier,central Himalaya which is one of the bench-mark glaciers in the region and has glaciological MB records from 1993 to 2013 with intermittent *** the present study,firstly the glaciological MB series is extended to 2014 i.e.,field-based MB for one more year is computed and,to compare with it,the geodetic MB is computed for the 1999–2014 period using high resolution Cartosat-1 digital elevation model(DEM)and SRTM ***,the study assesses the regional representation of the Dokriani Glacier in terms of MB and evaluates the influence of the MB regime on its morphological *** show that the average glaciological MB(-0.34±0.2 m water equivalent(w.e.)y-1)is more negative than the geodetic MB(-0.23±0.1 m w.e.y-1)for the 1999–2014 *** is likely because of the partial representation of glacier margins in the glaciological MB,where melting is strikingly low owing to thick debris cover(30 cm).In contrast,geodetic MB considers all marginal pixels leading to a comparatively low MB.A comparative assessment shows that the MB of Dokriani Glacier is less negative(possibly due to its huge accumulation area)than most other glacier-specific and regional MBs,restricting it to be a representative glacier in the ***,continuous negative MB has brought a peculiar change in the epiglacial morphology in the lower tongue of the glacier as differential debris thickness-induced differential melting has turned the glacier surface into a concave *** concavity has led to development of a large(10–20 m deep)supraglacial ch