1987至2021年天山博格达峰地区冰川面积变化特征  

Change Characteristics of Glacier Area in Bogda Peak Area of Tianshan Mountains from 1987 to 2021

作　　者：冯雪梅 武红旗[1] 胡贵锋 范燕敏 谷海斌 FENG Xuemei;WU Hongqi;HU Guifeng;FAN Yanmin;GU Haibin(College of Resource and Environment,Xinjiang Agricultural University,Urumqi,Xinjiang Uygur Autonomous Region,830052 China)

机构地区：[1]新疆农业大学资源与环境学院,新疆乌鲁木齐830052

出　　处：《科技资讯》2022年第20期127-131,共5页Science & Technology Information

摘　　要：冰川是全球淡水资源的重要组成部分,旱区冰川消融变化对局地生态环境影响迅速,对全球气候变化具有重要指示。该文基于1987—2021年Landsat遥感数据,采用NDSI法,逐年提取天山博格达峰区域冰川面积。结果表明:(1)天山博格达峰区域冰川NDSI最优提取阈值为0.38,近红外波段阈值为0.15;(2)1987—2021年博格达峰区域冰川面积整体呈现退缩趋势,年均退缩率为1.26%;(3)空间退缩上主要出现在冰川分布海拔较低的北部区域,坡向上冰川主要积累在北坡,退缩在主要是背风坡的东南坡。Glacier is an important part of global freshwater resources. Glacier melting changes in the dry areas has a rapid impact on the ecological environment of the local area and have important instructions on global climate change. Based on the Landsat remote sensing data from 1987 to 2021, this paper uses the NDSI method to extract the area of glaciers in the Bogda Peak region of the Tianshan Mountains year by year. The results show:(1) The optimal NDSI extraction threshold of glaciers in the Bogda Peak area of Tianshan Mountains is 0.38, and the threshold of near-infrared band is 0.15.(2) From 1987 to 2021, the area of glaciers in the Bogda Peak area showed a shrinking trend as a whole, with an average annual shrinkage rate of 1.26 %.(3) Spatial retreat mainly occurs in the northern area where the glaciers are distributed at lower altitudes;on the slope upward, glaciers mainly accumulate on the north slope, and retreat on the southeast slope, which is mainly the leeward slope.

关 键 词：NDSI 冰川面积 时空变化 博格达峰 

分 类 号：P343.6[天文地球—水文科学]