海冰动力学过程的数值模拟

讨论了海冰动力学性质并阐述决定海冰漂移的动量平衡,冰脊和水道形成及确定冰应力与形变、强度之间关系的海冰流变学.提出了模拟海冰动力学过程的数值模式,模式中冰厚分布由开阔水、平整冰和堆积冰3种要素表示.在这3要素的预报方程中引入形变函数,采用一种参数化方法模拟冰脊和水道.为了表示冰内相互作用,将海冰作为一种非线性粘性可压缩物质,采用粘-塑性本构关系.本文还概述和讨论了模式中所采用的数值方法,应用此模式模拟了渤海、波罗的海的波的尼亚湾和拉布拉多海的冰漂移.渤海冰漂移模拟结果明显地显示出潮周期变化,还模拟了渤海的冰脊和水道,进行了海冰流变学参数的敏感性试验.并将此冰模式与大气模式和边界层模式联接,给出渤海海冰预报结果.

Numerical simulation for dynamical processes of sea ice

This study discusses the behavior of ice dynamics and shows a momentum balance describing ice drift,the creation of leads and the building of ice ridge, and the nature of sea ice rheology relating the ice stress to the ice deformation and strength.A numerical model is presented for the simulation of sea ice dy- namical processes.For modelling the ice interaction,the sea ice is considered to be a nonlinear viscous com- pressible material obeying the visous-plastic constitutive law.The numerical scheme for the model is outlined and discussed in the study,This model is applied to simulate ice drift for the Bohai Sea,the Bothnia Gulf of the Baltic Sea and the Labrador Sea,respectively.The model results show that ice drift in the Boohnia Sea has a strong periodical change caused by tides.The creation of leads and ridges in the Bohai Sea are simulated and a sensitivity study of the ice rheology parameters is conducted.The ice model is linked to an atmospheric mod- el with a boundary layer model for numerical sea ice prediction and the results for the Bohai Sea are presented in the study.