摘要
本文利用PSU／NCAR的中尺度模式的第五次改进型MMS的静力平衡框架对北京地区的一次强降水过程进行了控制试验和敏感性试验。试验结果表明：预报的北京地区的累积降水量无论是强度还是位置都与实际非常一致，且雨量的变化也与实际相符。Grell对流参数化方案比郭晓岚和改进的Arakawa－Schu－bert对流参数化方案效果好；潜热释放对降水起关键性作用；且即使在水平格距为30km的情况下，对流参数化方案仍很重要，而仅用显式方案计算的降水量偏少。另外，本文还对这次降水过程在水平格距分别为30km和90km下的模拟效果进行了对比试验，结果表明：水平格距越小，就越能较真实地模拟出暴雨的降水强度及中尺度特征。
In this paper,the hydrostatic model of MM5 of PSU/NCAR is adopted tomake numerical simulation. The test shows:The accumu1ation precipitation in Beijing is con-sistent with the reality not only in strength but also in location,and the change of the precipi-tation is also consistent with the reality. The Grell(l993)scheme is the best among the Kuo(1974),Grell (1993)and the improved Arakawa-Schubert scheme; Releasing of latent heat isthe main element in causing precipitation;The cumulus convective parameterization is veryimportant when the horizontal distance is 3Okm,and in the explicit moisture scheme,the pre-cipitation is weaker than that has occurred. The comparative test has been made with thegrid distance bettween 3okm and 90km. The results show:the smaller the grid distance, thebetter the result of the simulation.
出处
《气象科学》
CSCD
北大核心
1998年第4期339-347,共9页
Journal of the Meteorological Sciences
基金
LASG开放实验室资助
关键词
中尺度
强降水
数值模拟
降水
mesoscale
heavy precipitation
MM5
numerical simulation
