Impacts of topographic factors on regional snow cover characteristics

作     者：Muattar Saydi Jian-li Ding Muattar Saydi;Jian-li Ding

作者机构：College of Resources and Environmental SciencesXinjiang UniversityUrumqi 830046China School of Geography and PlanningSun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Oasis EcologyXinjiang UniversityUrumqi 830046China 

出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)

年 卷 期：2020年第13卷第3期

页      面：171-180页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：This work was supported by the Xinjiang Uygur Autonomous Region’s Special Fund for Water Science and Technology(Grant No.2020.B-001) the National Natural Science Foundation of China(Grant No.41901033) Sun Yat-sen University’s Basic Research Fund for Young Scholars(Grant No.19lgpy57) 

主　　题：Snow cover Snowmelt Surface runoff MODIS Topographic effect Elevation Aspect Tianshan Mountains 

摘      要：At a local scale,snow cover is influenced by terrain properties,and it affects water availability across some arid and semiarid *** study aimed to quantify the spatial heterogeneity of snow cover due to topographic effects based on moderate-resolution image spectroradiometer(MODIS)daily snow cover products,processed with spatial and backward temporal filters.A snow-dominant region in the middle section of the northern Tianshan Mountains in China was selected,and the snow cover ratio(SCR)and the number of snow cover days(SCD)were *** results suggest that MODIS images are biased toward underestimation of the snow cover in the study region,and the error is primarily manifested within the elevation band of 1500e2500 *** snow cover is mainly affected by elevation,and snow mostly accumulates above 3800 *** addition,the differences in SCR and SCD between the south-and north-facing slopes are more significant than those between the east-and west-facing ***,the north-facing slopes have the maximum values of SCR and SCD,whereas the south-facing slopes have the minimum values of SCR and ***,the impact of slope gradients on snow cover varies across *** cover on a sloped surface decreases with the slope gradient during winter,while it tends to increase with the slope gradient during the other ***,this study presents a useful perspective on the variance in regional snow cover and provides guidance for the water resources management of snow meltwater with different terrain features.