Northern Hemisphere glaciation and its sensitivity to basal melt water
Northern Hemisphere glaciation and its sensitivity to basal melt water
复制标题
北半球冰川作用及其对基底融水的敏感性
DOI：
10.1016/s1040-6182(02)00028-9
复制
发表时间：
2002
影响因子：
2.2
通讯作者：
J. Fastook
中科院分区：
文献类型：
--
作者：
Jesse Johnson;J. Fastook
冰盖的有限元模型已被修改，包括一个帐户的基础融水。计算出的基底水量用于求出冰在河床上滑动的速度。通过一系列的模型试验研究了基底水和滑动速度的相互作用。被认为是模拟的拦截，增长，和去冰的北方半球。模拟是由GRIP冰芯数据控制的气候驱动的。实验对比了一些不同的机制，用于将基底水的量与滑动速度相关联。机制的范围从没有任何滑动，到滑动速度与基底水的量成比例的方案。模拟结果表明，滑动机制的选择对冰川循环有着显著的影响。此外，模拟结果表明，滑动速度必须与基底水深正确模拟一个完整的冰川循环。这种关系对于冰川循环的开始和所有其他阶段都很重要。末次盛冰期的冰量可以与估计的海平面上升进行比较，以进一步限制新的建模方法。
A finite element model for ice sheets has been modified to include an accounting of basal melt water. The calculated amount of basal water is used to find the velocity of ice sliding over the bed. The interplay of the basal water and sliding velocity is investigated by a series of modeling experiments. Simulations of the interception, growth, and de-glaciation of the Northern Hemisphere are considered. The simulations are driven with a climate controlled by the GRIP ice core data. The experiments contrast a number of different mechanisms for relating the amount of basal water and the sliding velocity. The mechanisms range from no sliding whatsoever, to a scheme in which the sliding velocity is proportional to the amount of basal water. The modeled results demonstrate that choice of sliding mechanism has a dramatic effect on the glaciation cycle. Furthermore, modeling results indicate that the sliding velocity must be related to the basal water depth to correctly simulate a complete glacial cycle. The relation is important to inception and all other phases of a glacial cycle. The volume of the ice at the last glacial maximum can be compared to the estimated sea level rise to further constrain the new modeling approaches.