一个用于研究湖泊对气候环境影响的非静力平衡数值模式

A NON-HYDROSTATIC NUMERICAL MODEL FOR STUDYING CLIMATIC EFFECTS OF LAKE

本文研制了一个包含云的微物理学参数化方案,地面温度和水温预报方案、边界层湍流参数化方案、长波辐射和短波辐射参数化方案的非静力平衡中小尺度数值模式。在模式中允许地面和大气有反馈过程。模式大气分为18层,土壤、水体以及水底土壤各分为4层,采用了能突出水体影响的网格系统。采用分解算法,平流项采用三次样条插值技术,并用正逆两次平滑来代替方程组中的水平扩散项。模式具有很好的积分稳定性,能精确地再现湖泊对气候环境影响的空间结构和时间变化。

In this paper, we developed a meso and micro scale nonhydrostatic numerical model considered the microphysical parameterization of clouds, prediction schemes of the surface temperature both on land and on wacer body, parameterization of the turbulence in planetary boundary layer, and calculation of long wave radiation and short wave radiation. Present model may permit the feedback between sur face and atmosphere. The model atmosphere with a vertical scale of 5500 m and a horizontal scale of 240 km is divided vertically into 18 layers and horizontally into 29-39 grids. This grid system may project the effects of inland waser body. The upstream cubic spline interpolation technique is adopted in the advection terms. The positive and counter filtering is adopted for replacing the horizontal diffusion terms. This model is of excellent stability of integration, and reproduces procisely the temporal change and spatial structure of the effect of inland water body on climate.