干旱区地理2024，Vol.47Issue(5)：810-819,10.DOI:10.12118/j.issn.1000-6060.2023.519
1990-2020年波曲流域冰川冰湖时空变化及其对气候变化的响应
Temporal and spatial changes of glaciers and glacier lakes and its response to climate change in Poiqu Basin during 1990-2020
摘要
Abstract
Utilizing Landsat TM/ETM+/OLI imagery and digital elevation model(DEM)data,this study extract-ed the boundaries of glaciers and glacial lakes in Poiqu Basin,Xigaze City,Xizang Autonomous Region,China from 1990 to 2020 through the ratio threshold method and visual interpretation.The distribution and variation of glaciers and glacial lakes over three decades were analyzed,alongside the exploration of their co-evolution and re-sponse to climate change within the basin.The findings revealed:(1)A notable acceleration in glacier shrinkage within the Poiqu Basin over the last decade,with glaciers primarily situated between 5500 m and 6100 m.While the count of large-scale glaciers(≥10 km2)remained constant,small-scale glaciers(≤0.5 km2)exhibited an up-ward trend.(2)Both the number and area of glacial lakes witnessed a significant increase,with an expansion rate of 74.24%.Predominantly located between 4900 m and 5300 m,the expansion was more pronounced in larger glacial lakes(≥0.07 km2),whereas smaller lakes(≤0.03 km2)also saw a marked rise in numbers.(3)Glacial lakes connected to their parent glaciers emerged as the most significant type contributing to glacial lake expan-sion,registering a 72.08%increase.(4)The past 30 years have experienced a gradual temperature rise and a mi-nor decline in precipitation.These climatic shifts,particularly the temperature increase and precipitation decrease,have been crucial in glacier retreat,while meltwater from glaciers has facilitated the expansion of glacial lakes.Through examining the distribution,changes,and interrelation of glaciers and glacial lakes in Poiqu Basin,this study aims to provide valuable data support for understanding glacier area dynamics and aiding in the prediction and mitigation of glacial lake outburst floods.关键词
波曲流域/冰川退缩/冰湖扩张/气候响应Key words
Poiqu Basin/glacier retreat/glacier lake expansion/climatic response引用本文复制引用
王小丽,周凌翔,王秀东,何颖..1990-2020年波曲流域冰川冰湖时空变化及其对气候变化的响应[J].干旱区地理,2024,47(5):810-819,10.基金项目
国家自然科学基金项目(42071277) （42071277）
重庆市教育委员会人文社会科学研究项目(23SKID049) （23SKID049）
重庆市教委科学技术研究项目(KJQN202000525) （KJQN202000525）
重庆师范大学基金项目(23XWB032)资助 （23XWB032）
