利用 Landsat8 分析冬克玛底冰川表面反照率时空变化  

Temporal and Spatial Variation of Surface Albedo of Dongkemadi Glacier Based on Landsat8

作　　者：廖虹怡 柳林 LIAO Hongyi;LIU Lin(Physics Center for Gravitational Experiments,Huazhong University of Science and Technology School,Wuhan 430074,China;Physics Geophysics Institute,Huazhong University of Science and Technology School,Wuhan 430074,China)

机构地区：[1]华中科技大学物理学院引力实验中心,湖北武汉430074 [2]华中科技大学物理学院地球物理研究所,湖北武汉430074

出　　处：《测绘地理信息》2024年第3期19-24,共6页Journal of Geomatics

基　　金：国家自然科学基金(42274028,41704023,41804014)。

摘　　要：冰川表面反照率是连接冰川表面能量与物质平衡的纽带,决定冰川物质消融量。本文利用2013—2020年获取的96景Landsat8 OLI多光谱遥感影像,基于地形纠正、大气校正和反射率转换为反照率的方法,反演唐古拉山冬克玛底冰川的时间序列反照率结果。研究表明:①冰川表面反照率与海拔高度存在明显的相关性,反照率随着海拔高度的增加而逐渐增大;②2013—2020年冬克玛底冰川表面反照率呈现微弱下降的趋势,速率为-0.0004/10 a。结合该地区同时期气象站观测的气温和降水数据分析,冬克玛底冰川表面反照率的下降主要由气温上升引起(冰川表面反照率与温度呈负相关关系)。此外,受到气温和降水的共同影响,冬克玛底冰川表面反照率的年内变化特征为:1月—8月持续下降,9月—12月迅速上升。Glacier albedo is the link between the energy and mass balance on the surface,which is determines the amount of glacier mass ablation.In this paper,96-sence Landsat8 OLI multi-spectral remote sensing from 2013 to 2020 are used to derive the time series albedo results in the Dongkemadi Gla⁃cier Tanggula Mountains based on topographic correction,at⁃mospheric correction and reflectance conversion to albedo.It is found that:①Glacier albedo has obvious correlation with the altitude,and albedo increases with altitude;②During the period of 2013-2020,albedo of glacier appeared a slight de⁃creasing trend with a rate of−0.0004/10 a.Combined with the temperature and precipitation data observed by meteoro⁃logical station in the same period,the analysis shows that the decrease of albedo of Dongkemadi Glacier is mainly caused by temperature rise(glacier albedo and temperature are negative⁃ly related).In addition,under the joint influence of tempera⁃ture and precipitation,the annual variation of the albedo Dong⁃kemadi Glacier is as follows:it continues to decrease from January to August,and increases rapidly from September to December.

关 键 词：冬克玛底冰川 Landsat 8 反照率 时空变化特征 

分 类 号：P232[天文地球—摄影测量与遥感]