采用高亚洲精细再分析数据(High AsiaRefinedanalysis,HAR)以及Coupled SnowpackandIceSurfaceEn⁃ergy andMassbalanceModel(COSIMA)模拟了青藏高原最大冰原——普若岗日2012-04-23—2014-05-11的能量-物质平衡,并分析了普若岗日冰原消...采用高亚洲精细再分析数据(High AsiaRefinedanalysis,HAR)以及Coupled SnowpackandIceSurfaceEn⁃ergy andMassbalanceModel(COSIMA)模拟了青藏高原最大冰原——普若岗日2012-04-23—2014-05-11的能量-物质平衡,并分析了普若岗日冰原消融机理。模拟的2012-04-23—2013-05-23与2013-05-23—2014-05-11的物质平衡分别为-0.18 m w.e.、-0.36 m w.e.。在整个研究时段内,冰原西部、中北部等海拔低于5800 m的区域处于物质亏损状态,最大达到-2.69 m w.e.;冰原北部区域因为海拔较高的原因,处于物质积累状态,在东北部区域最高值达到0.85 m w.e.。2013-05-23—2014-05-11用于消融的能量相比2012-04-23—2013-05-23减少,冰川表面消融减速,但普若岗日冰原上空2013-05-23—2014-05-11的固态降水量少于2012-04-23—2013-05-23,因此冰川在2013-05-23—2014-05-11日的表面净物质平衡反而减少。展开更多
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 an...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.展开更多
文摘采用高亚洲精细再分析数据(High AsiaRefinedanalysis,HAR)以及Coupled SnowpackandIceSurfaceEn⁃ergy andMassbalanceModel(COSIMA)模拟了青藏高原最大冰原——普若岗日2012-04-23—2014-05-11的能量-物质平衡,并分析了普若岗日冰原消融机理。模拟的2012-04-23—2013-05-23与2013-05-23—2014-05-11的物质平衡分别为-0.18 m w.e.、-0.36 m w.e.。在整个研究时段内,冰原西部、中北部等海拔低于5800 m的区域处于物质亏损状态,最大达到-2.69 m w.e.;冰原北部区域因为海拔较高的原因,处于物质积累状态,在东北部区域最高值达到0.85 m w.e.。2013-05-23—2014-05-11用于消融的能量相比2012-04-23—2013-05-23减少,冰川表面消融减速,但普若岗日冰原上空2013-05-23—2014-05-11的固态降水量少于2012-04-23—2013-05-23,因此冰川在2013-05-23—2014-05-11日的表面净物质平衡反而减少。
基金The Second Tibetan Plateau Scientific Expedition and Research Program,No.2019QZKK020102National Natural Science Foundation of China,No.42130516。
文摘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.
