P-σ坐标区域气候模式的垂直分辨率对模拟结果的影响

The Effects of Vertical Resolution of P-σ Coordinate Regional Climate Model on Simulated Results

在原五层P σ坐标模式的基础上 ,发展了一个九层 1°× 1°P σ坐标区域气候模式 ,并用多年平均的NCEP再分析资料月平均场与五层模式进行了模拟对比检验。对比检验表明 ,改进后的九层模式对高度场、温度场及降水场的模拟均要优于原五层模式。对于风场的模拟 ,在冬季对流层中下层 ,九层模式的模拟要好于五层模式 ,夏季九层模式的模拟不如五层模式。但总的来讲 ,垂直分辨率的提高对P σ坐标模式的模拟具有较显著的改进效果 。

A nine level 1°×1° Pσ corrdinate regional climate model is developed on the basis of a five level Pσ model and inter comparisons the simulated results of the nine level model and the fivelevel model are carried out by using the NCEP reanalysis monthly mean data. It is found that the improved nine level model has a better simulations of the geopotential field, the temperature field and the precipitation field in winter and summer. For the simulation of wind fields, the ninelevel model performs better than the fivelevel model in the lower layers in winter, however, a little worse in summer. In the whole, the increase of vertical resolution results in large improvements of the P σmodel simulation and it is a fair preparation for the further developing of the regional oceanatmospheric coupled model.