PISM冰盖模式对Amery冰架流速场模拟的适用性

在全球气候变暖的背景下,冰架系统是监视和预测冰盖稳定性的理想研究区域。然而传统的冰架观测与调查方法只能从某一侧面揭示冰架的运动状态和演化信息,无法预测其未来变化;冰盖模式作为非常有潜力的数值计算方法,成为研究和预测冰盖/冰架演化的热点领域。Lambert冰川-Amery冰架系统是东南极冰盖最大的冰川系统,对于研究东南极冰盖的物质平衡和冰盖稳定性具有重要意义。使用PISM冰盖模式,对该冰川系统的流动过程进行模拟,得到冰表面流速场数据,并将模拟流速场与实测数据进行对比,发现两者在大部分区域吻合较好,但在冰架前缘处呈现出一些差异。进一步讨论差异可能的来源以及模拟可以改进的地方。

APPLICABILITY PISM FOR VELOCITY ANALYSIS OF THE AMERY ICE SHELF,EAST ANTARCTICA

In the context of global climate change, ice shelf systems have become critically important for accessing ice sheet stability. Conventionally, measurement-based approaches are limited in addressing ice sheet motion and evolution. Ice sheet modeling provides a valuable and effective tool to study the dynamics and evolution of ice shelves. The Lambert-Amery ice shelf system, the largest glacier system in East Antarctica, and a vital part in researching the mass balance and stability of East Antarctica Ice Sheet, is studied with the PISM ice sheet model. We simulate the surface ice velocity field of this glacier system and compare the model result with actual measurement by remote sensing. The comparison indicates that the model performs well in predicting the velocity field across the Amery Ice Shelf. We further discuss the prospect of applying ice sheet model in research on the evolution of ice sheets and ice caps.