Abstract:Based on the new generation numerical prediction model GRAPES_Meso, the numerical experiments were carried out to evaluate the two kinds of cumulus convective parameterization schemes, Kain Fritsch Eta scheme and Betts Miller Janjic scheme, for the winter (January) and summer (June-August) 2009. The results show that there is no obvious differences between the two schemes for winter, but some differences exist for the summer. The statistic characteristic of meteorological fields, such as wind, height and temperature, shows that BMJ performances slightly better than KFeta in the low atmospheric layer, but it does not do as well as KFeta in the middle and high layers. The results of T Score verification indicate that KFeta scheme has a higher score than BMJ scheme for precipitation forecast, especially in predicting moderate to heavy rains over southern China. The spatial distribution of the average contribution rate in total precipitation of the two schemes is different obviously in the low latitude ocean region, where the contribution rate of BMJ scheme is greater than KFeta scheme. In the drizzle level, the probability distribution of cumulus precipitation contribution rate in total precipitation looks like steep “U” shaped. With the increase of precipitation levels, the proportion of cumulus precipitation of KFeta becomes large. On the contrary, the higher of the precipitation level is, the lower proportion of the cumulus precipitation reaches by using the BMJ cumulus scheme.