修正的质量通量积云对流方案及其模拟试验研究 Ⅱ:三种积云方案的积云对流活动及MFS方案相关参数的敏感性试验

MODIFIED MASS FLUX CUMULUS PARAMETERIZATION SCHEME AND ITS SIMULATION EXPERIMENT PART Ⅱ:CUMULUS CONVECTION OF THE SCHEMES AND THE SENSITIVITY EXPERIMENTS OF MFS

中文关键词:  质量通量方案  积云对流活动  敏感性试验

英文关键词:Mass flux scheme  Cumulus convection  Sensitivity experiment

中文摘要:

      作者在“修正的质量通量积云对流方案及其模拟试验研究I:方案介绍及对1991年洪涝过程的模拟”论文中提出的质量通量方案成功地植入区域气候模式RegCM2的基础上,对比分析质量通量方案MFS,Kuo方案和Grell方案对积云对流活动的模拟,结果表明质量通量方案较好地模拟了积云对流活动过程。针对质量通量方案中的一些参数,如云水向雨水的转换率、混合卷入率、混合卷出率和下沉气流的强度等进行了一系列的敏感性试验,试验结果表明积云对流活动对这些参数比较敏感,因此提高这些参数的准确性是改进积云对流参数化方案的重要内容之一。

英文摘要:

      By comparison of the simulated cumulus convection process of RegCM2 using the Kuo scheme, the Grell scheme and the MFS, it is found that the MFS can simulate the cumulus heating and moistening very well. A series of sensitivity tests shown that the disposable parameters for specifying the conversion from cloud droplet storaindrops, the turbulentent rainment and detrainment rates in updrafts and do wndrafts, and the intensity of the dow ndrafts have different degrees of influence to the cumulus convection. Therefore it is much important for cumulus parameterization scheme to define these parameters as accurately as possible.