大气环流模式降水的模拟对水汽方程差分方案的敏感性试验

The Sensitivity of Precipitation Simulation to Difference Schemes of Water Vapor Equation in Atmosphere General Circulation Model

分别采用３种应用比较广泛的水汽方程差分方案：多维正定平流传输方案（ＭＰＤＡＴＡ）、通量修正传输方案（ＦＣＴ）和两步保形平流方案（ＴＳＰＡＳ），对大气物理所９层大气环流模式（ＩＡＰ９Ｌ ＡＧＣＭ）的降水模拟作敏感性试验，分析比较３种方案下模式降水气候平均场的差异，从而揭示模式降水对水汽方程差分方案的敏感性。试验结果显示，不同的水汽方程差分方案对大气环流模式降水的气候模拟有较大影响，并出此从３种差分方案中为ＩＡＰ ９Ｌ ＡＧＣＭ寻找出一种较好的水汽计算方案。

Three types of difference schemes of water vapor equation are introduced into IAP 9L AGCM which are Multidimensional Positive Definite Advection Transport Algorithm (MPDATA), Flux-Corrected Transport Algorithm (FCT) and Two-Step Shape-Preserving Advection Scheme (TSPAS). The simulated precipitations of 10 years corresponding with them are compared and analyzed. The result shows that the simulation of precipitation in AGCM is influenced by difference schemes of water vapor equation, and a scheme most suitable for the model is chosen from the above three schemes.