一个热动力海冰模式的改进与实验

Improvement of a Thermodynamic-dynamic Sea Ice Model

影响海冰变化的物理因素中热力和动力部分是同等重要的,但多数热动力海冰模式的热力部分考虑得较为简单。针对Hibler热动力海冰模式的不足,以1个3层热力模式为基础改进了其热力部分。比较了原模式中的零层热力模式和用于改进的3层热力模式;并应用改进前后的两种热动力模式对1983年的北极海冰进行了模拟。模拟结果表明,海冰厚度比原模式厚,季节变化减弱,海冰密集度与观测资料更为符合。

The thermal and dynamic factors are equally important in influencing sea ice, however, the thermal part in most existing thermodynamic-dynamic sea ice models was only simply considered. The Winton＇s enthalpy conservation three-layer thermodynamic model has been used in this paper to replace the zero-layer one in the Hibler thermodynamic-dynamic sea ice model,and the 1983 Arctic sea ice has been simulated using the Hibler and the improved Hibler model. Simulations suggest that the simulated sea ice thickness is larger, the seasonal variation of the sea ice thickness is smaller, and the simulated sea ice compactness is in better accordance with the observed in the improved Hibler model.