摘要
通过对地形图和Landsat系列影像的目视解译获取冰川边界,分析得到1971-2015年羌塘高原藏色岗日冰川变化。结果表明:2015年研究区有冰川84条,总面积(297.65±4.29)km^2;1971-2015年冰川持续退缩,面积减少(19.32±24.31)km^2,年均退缩率为(0.14±0.17)%,退缩较慢;五个时段年均退缩速率分别为(0.12±1.46)%、(0.20±0.32)%、(0.12±0.50)%、(0.01±0.57)%和(0.16±0.31)%。消融期(5-9月)温度的上升是研究区冰川退缩的主要驱动力。小规模冰川(<0.5km^2)的退缩率14.00%大于大规模冰川(>2km^2)的5.58%;北朝向冰川的退缩率8.06%大于南朝向冰川的4.16%;冰川数量由78条增加到84条反映出大冰川在退缩的过程中分裂成小冰川;2条冰川末端发生前进。
The inaccessibility of many glaciers makes remote sensing data crucial at glacier change monitoring.Glacier outlines were digitized on-screen manually from topographic maps and Landsat images. Glacier change characteristics were analyzed at Zangser Kangri on the Qiangtang Plateau from1971 to2015. The results reveal there are84 glaciers in2015,covering an area of(297.65±4.29)km^2,while56 of them are smaller than1 km^2 and there are44 and16 glaciers facing north and south respectively. Glacier area decreased by(19.32±24.31)km^2from1971 to2015,at the annual shrinkage rate of(0.14±0.17)%,which is relatively slow. The annual shrinkage rates are(0.12±1.46)% for1971-1977,(0.20±0.32)% for1977-1993,(0.12±0.50)% for1993-2000,(0.01±0.57)% for2000-2006 and(0.16±0.31)% for2006-2015,respectively. Based on the meteorological data,ERA-Interim reanalysis and ice cores records,the increased ablation season(May to September)temperature is the main driving force accounting for the shrinkage. Small glaciers(<0.5 km^2)retreated faster at the rate of14.00% than big glaciers(>2 km^2)at the rate of5.58%. Northward glaciers shrank faster at the rate of8.06% than southward glaciers at the rate of4.16%. The increased number(from78 to84)of glaciers indicates big glaciers subdivided to small glaciers while retreating quickly. Two glaciers advanced during our study period.
作者
贾博文
侯书贵
王叶堂
JIA Bowen;HOU Shugui;WANG Yetang(School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China;College of Geography and Environment,Shandong Normal University,Jinan 250014,China)
出处
《冰川冻土》
CSCD
北大核心
2020年第2期307-317,共11页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(41830644,41330526,41711530148)资助。
关键词
冰川变化
藏色岗日
羌塘高原
遥感
气候变化
glacier change
Zangser Kangri
Qiangtang Plateau
remote sensing
climate change
