混合坐标大洋环流模式Hycom的坐标选取与参数化设置敏感性试验

Study of Sensitivity to the choices of Vertical Coorolinate and Vertical Mixing Parameters in Hycom Model

在移植并拓展建立一个全球范围Hycom模式的基础上,针对混合坐标的选取和参数化设置设计了几组敏感性试验,初步揭示了选取不同的混合坐标和设置不同的参数值对模式模拟结果的影响。研究表明:混合坐标中的z坐标的设置差异对混合层的模拟影响较大;对混合坐标中的等密度坐标而言,前几层取值稍小些会提高模拟效果;动量耗散的辐散速度是影响模拟结果的重要参数。

On the basis of transplanting, spreading and establishing the hybrid coordinate oceanic circulation model for the whole world, this paper designs several different experiments for choosing the vertical coordinate and setting the parameters, discovers the effect of choosing the different vertical coordinate and setting the different parameters for the simulation results. The results indicates that, the various of the setting of the z coordinate in the Hycom affects the simulation of the mixing layer obviously; For the isopycnic coordinates in the Hycom, choosing smaller value on the first several layers will increase the simulation results; The diffusion velocity （m/s） for biharmonic momentum dissip is an very important factor for the simulation results.