格陵兰岛Petermann冰川崩解事件观测（2017）

海冰的减少和表面融水的增加，可能诱发冰流加速和锋面塌陷，对格陵兰冰架的稳定性有重大影响。然而，由于稀少的遥感观测，快速崩解之前的详细冰动态前兆和驱动因素仍然不清楚。我们通过联合使用高时空分辨率的遥感观测和冰流模型，对格陵兰岛北部Petermann冰川2017年7月26日崩解事件前的水文和运动学前兆进行了全面调查。2017年7月期间的冰流速度场的时间序列是通过Sentinel-2的观测来检索的，采样间隔为次周。冰流速度在7月26日（崩解前一天）迅速达到30米/天，这大约是平均冰川速度的10倍。Reduced sea ice extent and increased surface meltwater may trigger accelerated ice flow and calving front collapse, posing significant impacts on the stability of Greenland's ice shelves. However, due to limited remote sensing observations, detailed ice dynamic precursors and driving mechanisms prior to rapid calving events remain poorly understood. We conducted a comprehensive investigation of the hydrological and kinematic precursors preceding the 26 July 2017 calving event at Petermann Glacier in northern Greenland by combining high-spatiotemporal-resolution remote sensing observations with ice flow models. Time series of ice flow velocity fields during July 2017 were retrieved from Sentinel-2 observations, with a sampling interval of every other week. The ice flow velocity rapidly reached 30 meters per day on 26 July, one day prior to the calving event, which was approximately 10 times the average glacier flow speed.

搜集汇总

背景与挑战

背景概述

该数据集聚焦格陵兰岛Petermann冰川2017年7月26日的崩解事件，利用高时空分辨率遥感观测和冰流模型，揭示了崩解前冰流速度急剧增加至30米/天（约为平均速度的10倍）的水文和运动学前兆，旨在填补对冰川快速崩解驱动因素的认识空白。