Steady-state characteristics of the Greenland ice sheet under different climates
Steady-state characteristics of the Greenland ice sheet under different climates
复制标题
不同气候下格陵兰冰盖的稳态特征
DOI：
10.3189/s0022143000042908
复制
发表时间：
1991
影响因子：
3.4
通讯作者：
N. Reeh
中科院分区：
文献类型：
--
作者：
A. Letréguilly;P. Huybrechts;N. Reeh
本文对格陵兰冰盖进行了模拟，以模拟其在温暖气候条件下的范围和体积，并探讨在目前的气候条件下，冰盖是否会在无冰基岩上重新形成。冰盖模式是一个具有精细分辨率网格的三维热力学模式。哥本哈根电磁研究所使用无线电回声探测测量绘制了冰盖下方的基岩表面。模型实验表明，温度升高会导致冰缘退缩，但冰盖相对稳定，冰盖完全消失至少需要6 ℃的温度升高，这表明冰盖可能在末次间冰期幸存下来。此外，格陵兰冰盖似乎不仅仅是以前较冷气候的残余冰块，而且在目前甚至稍微温暖的气候条件下，冰盖仍将在裸露的基岩上重新形成。
Abstract The Greenland ice sheet is modelled to simulate its extent and volume in warmer climates, and to find out whether the ice sheet would re-form on the ice-free bedrock under present climatic conditions. The ice-sheet model is a three-dimensional thermo-mechanical model with a fine-resolution grid. The bedrock surface beneath the ice sheet was mapped using radio-echo-sounding measurements by the Electromagnetic Institute, Copenhagen. The model experiments show that increased temperature will result in ice-margin retreat, but the ice sheet is relatively stable; it takes a temperature rise of at least 6 deg for the ice sheet to disappear completely, which indicates that the ice sheet probably survived the last interglacial. Furthermore, it appears that the Greenland ice sheet is not a mere relict ice mass from a previously colder climate but that the ice sheet will still re-form on the bare bedrock under the present, or even slightly warmer, climatic conditions.