模式水平分辨率影响积云对流参数化效果的数值试验  

NUMERICAL EXPERIMENTS OF EFFECT OF MODEL HORIZONTAL RESOLUTION ON CUMULUS PARAMETERIZATION

作　　者：周天军[1] 钱永甫[1] 

机构地区：[1]南京大学大气科学系

出　　处：《高原气象》1996年第2期204-211,共8页Plateau Meteorology

摘　　要：利用一个有限区域嵌套细网格数值预报模式，设计了３种不同分辨率的模式网格，通过对一次降水过程的预报，检验了模式水平分辨率对积云对流参数化效果的影响。结果表明：模式水平分辨率的变化将直接影响到积云对流参数化的效果，从而影响降水场和形势场。文中还讨论了积云对流参数化的作用，发现当模式水平分辨率较粗时，模式中有无积云对流过程对形势场预报结果的影响无明显规律可循，但是当模式水平分辨率提高到一定程度时（高于１．０°），引入积云对流过程，将使在低层大气预报的高度场与实际场的相关系数明显提高，在高层则有所降低。In this paper,an one-way nested limited area primitive equation model is used to study effects of horizontal resolution on cumulus parameterization. It is found that the change of horizontal resolution has notable effect on cumulus paramerization , and leads to the variation in the forecasted rain field and the synoptic situation. The role of cumulus parameterization in numerical model is also discussed. The results show that , when model horizontal grid length decreased to less than 1. 0 °,including the cumulus parameterization can increase remarkably correlation coefficient between the forecasted and the observed height field in the lower atmosphere layer,but it decrease evidently in the upper layer.

关 键 词：水平分辨率 积云 对流参数化 数值试验 

分 类 号：P435[天文地球—大气科学及气象学] P421.31