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机构地区:[1]浙江大学地球科学系,浙江杭州310027 [2]中国极地研究中心,上海200136
出 处:《极地研究》2015年第3期229-236,共8页Chinese Journal of Polar Research
基 金:国家自然科学基金(40874060;41176167);国家高技术研究发展计划(863计划)(2011AA040202);国家重点基础研究发展计划(973计划)(2012CB957702)资助
摘 要: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。In the context of global climate change, the investigation of ice-shelf systems has become critically important to assess ice-sheet stability. Conventional measurement-based approaches to the analysis of ice-sheet motion and evolution are limited. However, ice-sheet modeling provides a valuable and effective tool to study the dynamics and evolution of ice shelves. Here, the Lambert-Amery ice shelf system, the largest glacier system in East Antarctica and an important focus of research into the mass balance and stability of the East Antarctica Ice Sheet, is studied using the PISM ice sheet model. We simulate the surface ice velocity field of this glacier system and compare the model results with actual measurements from remote sensing. The comparison indicates that the model performs well to predict the velocity field across the Amery Ice Shelf. We further discuss the prospect of applying ice sheet modeling to research into the evolution of ice sheets and ice caps.
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