Analyzing geomorphological and topographical controls for the heterogeneous glacier mass balance in the Sikkim Himalayas

作     者：GUHA Supratim TIWARI Reet Kamal GUHA Supratim;TIWARI Reet Kamal

作者机构：Geomatics Engineering LaboratoryDepartment of Civil EngineeringIndian Institute of Technology RoparPunjab-140001India 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2023年第20卷第7期

页      面：1854-1864页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 09[农学] 070501[理学-自然地理学] 0303[法学-社会学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术] 0706[理学-大气科学] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：U.S. Geological Survey  USGS 

主　　题：Glacier mass balance Glacier terminus Topographical parameter Sikkim Himalaya Multiple linear regression model 

摘      要：Glacier response patterns at the catchment scale are highly heterogeneous and defined by a complex interplay of various dynamics and surface *** studies have explained heterogeneous responses in qualitative ways but quantitative assessment is lacking yet where an intrazone homogeneous climate assumption can be ***,in the current study,the reason for heterogeneous mass balance has been explained in quantitative methods using a multiple linear regression model in the Sikkim Himalayan *** first,the topographical parameters are selected from previously published studies,then the most significant topographical and geomorphological parameters are selected with backward stepwise subset selection ***,the contributions of selected parameters are calculated by least square *** results show that,the magnitude of mass balance lies between-0.003±0.24 to-1.029±0.24 m.w.e.a^(-1) between 2000 and 2020 in the Sikkim Himalaya ***,the study shows that,out of the terminus type of the glacier,glacier area,debris cover,ice-mixed debris,slope,aspect,mean elevation,and snout elevation of the glaciers,only the terminus type and mean elevation of the glacier are significantly altering the glacier mass balance in the Sikkim Himalayan ***,the mass loss is approximately 0.40 m.w.e.a^(-1) higher in the lake-terminating glaciers compared to the land-terminating glaciers in the same elevation *** the other hand,a thousand meters mean elevation drop is associated with 0.179 m.w.e.a-1of mass loss despite the terminus type of the *** the current study,the model using the terminus type of the glaciers and the mean elevation of the glaciers explains 76% of fluctuation of mass balance in the Sikkim Himalayan region.