摘要
针对2000年以来各拉丹冬地区冰川消融加速的问题,利用SRTM-C DEM、ZY-3 DEM和ICESat-1激光测高数据,采用DEM差分法获得2000—2020年间的冰川高程变化。结合2000年、2009年、2015年及2020年4个时段的陆地卫星光学影像的冰雪指数提取了这4个时段的冰川面积;采用体积分方法获得较为可靠的各拉丹冬地区2000—2020年冰川储量变化,并分析了降水和气温变化对冰川储量变化的影响。结果表明:2000—2020年各拉丹冬冰川面积退缩了80.449 km2,面积变化率为9.91%,平均退缩速率为4.022 km2/a。冰川平均高程变化为-0.266 m/a,冰川储量变化为-0.26 Gt/a。2000—2020年,各拉丹冬冰川整体处于消融状态,该地区整体上气温升高、降水量减少,这可能是冰川储量减少的主要原因。
To address the problem of accelerated glacier melting in the Geladandong region since 2000,this paper utilizes SRTM-C DEM,ZY-3 DEM and ICESat-1 laser altimetry data to obtain the glacier elevation changes from 2000 to 2020 using the DEM difference method;glacier area was extracted for the four time periods 2000,2009,2015 and 2020 using the normalized difference snow/ice index from Landsat optical imagery for these four time periods;the volume fraction method was used to obtain more reliable glacier reserves changes in the Geladandong region from 2000 to 2020,and the effects of precipitation and temperature changes on the changes in glacier reserves were analyzed.The results show that from 2000 to 2020,the area of the glacier in Geladandong decreased by 80.449 km²,with a change rate of 9.91%,and an average decrease rate of 4.022 km?/a.The average change in glacier elevation was-0.266 m/a,and the change in glacier reserves was 0.26 Gt/a.From 2000 to 2020,the Geladandong glacier as a whole is in the state of melting,and the region as a whole experiences higher temperatures and lower precipitation,which may be the main reason for the decrease in glacier reserves.
作者
孙昌辉
张永红
康永辉
吴宏安
魏钜杰
SUN Changhui;ZHANG Yonghong;KANG Yonghui;WU Hong'an;WEI Jujie(College Geomatics,of Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Chinese Academy of Surveying&Mapping,Beijing 100036,China;School of Innovation and Practice,Liaoning Technical University,Fuxin,Liaoning 123000,China)
出处
《测绘科学》
CSCD
北大核心
2024年第3期117-126,共10页
Science of Surveying and Mapping
基金
自然资源部科技项目(A2319)。
