Modelling of the dynamics of Fimbulisen, Antarctica

该项目的目的是了解菲姆布利森目前的动态，对冰架动态及其对全球和局部变暖的反应进行预测性研究。位于Dronning Maud陆地海岸的Fimbuisen冰架是唯一延伸到大陆架以外的冰架。这个裸露的位置可能允许温暖的海水流入冰架空洞，并产生高融化速率。高融化速率可能会导致冰的温度深度分布异常，温度向底部下降，这是在这个冰架上专门测量的。由于格伦流动定律表现出强烈的温度相关的流速因子，冰的温度分布对流速有直接的影响。温度分布的形状本身是由表层和底部的累积速率驱动的。这需要了解冰架下的融化速度，从而了解海洋动力学。因此，最好的方法是在冰架模型和海洋模型之间进行耦合。在浅陆架近似(SSA)下，水平速度的椭圆边值问题以及温度和冰层厚度的演化将通过有限元技术的数值解来求解。

The aim of the project is to gain an understanding of the present day dynamics of Fimbulisen, prognostic studies of the ice-shelf dynamics and its response to global, as well as local, warming. The Fimbulisen, situated along the coast of Dronning Maud Land, is the only ice shelf extending beyond the continental shelf. This exposed position presumably allows warm ocean water draining into the ice shelf cavity and produces high melt rates. The high melt rates likely cause the unusual temperature depth profile of the ice, with decreasing temperature towards the bottom, that is measured exclusively at this ice shelf. The temperature profile of the ice has a direct inuence on the velocity of the ow, because Glen's flow law exhibits a the strongly temperature-dependent flow-rate factor. The shape of the temperature profile itself is driven by surface and bottom accumulation rates. That requires knowledge of the melt rates beneath the ice shelf, and thus of the ocean dynamics. Therefore, the best procedure is a coupling between an ice shelf model and an ocean model. The elliptic boundary-value problem for the horizontal velocity in the shallow-shelf approximation (SSA) and the temperature and ice thickness evolutions will be solved by means of numerical solutions by finite element technique.