摘要
The Puruogangri Ice Field(PIF), classified as an ultra-continental glacier, is considered extremely stable. However, several glaciers in this area have recently experienced surge events with significant instability and information on surge-type glaciers(STGs) in this region remains scarce. In this study, we identified six STGs and reported the observed characteristics of their surging behavior in the region by mapping glacier boundaries, surface flow velocity information, and glacier surface elevation changes using recent Landsat satellite imagery and shuttle radar topography mission(SRTM), TanDEM, and ASTER digital elevation model(AST14DEM) data. These data provide valuable insights into recent glacial processes, flow instability, and rapid glacial movement. During the active phase of the glaciers,all exhibited frontal advances and changes in surface elevation. Owing to limitations in the satellite imagery, flow velocity profiles were only available for glaciers N1(G089071E33998N),NE1(G089128E33943N), and SE3(G089278E33913N) during the active phase. However,these results effectively reflect the velocity variations in both glaciers before, during, and after the surge. Based on the characteristics of the STG, scientific expeditions, and meteorological data, we believe that the surge in PIF was largely influenced by glacier meltwater and changes in subglacial drainage systems.
作者
周苏刚
王宁练
李志杰
姚晓军
张玉杰
秦格霞
ZHOU Sugang;WANG Ninglian;LI Zhijie;YAO Xiaojun;ZHANG Yujie;QIN Gexia(Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,College of Urban and Environmental Sciences,Northwest University,Xi'an 710127,China;Institute of Earth Surface System and Hazards,College of Urban and Environmental Sciences,Northwest University,Xi'an 710127,China;College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China)
基金
The Second Tibetan Plateau Scientific Expedition and Research Program,No.2019QZKK020102
National Natural Science Foundation of China,No.42130516。
