中文摘要：

中尺度模式中描述湿物理过程的方案主要有对流参数化方案和云微物理方案,当网格距达到可以分辨积云对流尺度时,云微物理方案对描述云和降水物理过程的作用将变得更为重要。利用GRAPES高分辨率中尺度数值模式对2007年7月7—9日中国梅雨锋暴雨过程进行了数值模拟,从降水量、雷达回波、水成物分布方面结合观测资料,分析了NCFP简单冰相方案（Ncepcloud3）、复杂冰相方案（Ncepcloud5）、中国气象科学研究院（CAMS）双参数复杂冰相微物理方案对梅雨锋暴雨模拟结果的影响。研究表明,对于这次暴雨过程,CAMS方案对小雨、中雨和大雨的模拟最好,Ncepcloud3和Ncepcloud5方案在暴雨以上的TS评分较高,CAMS方案模拟的暴雨中心最大值最接近实况;不同微物理方案对中尺度对流系统形成发展的模拟有差别,Ncepcloud5方案模拟的弱回波范围偏小,CAMS方案在强回波两侧的弱回波区范围虽比实况偏大,但反映了对流回波周围存在层状回波的特点;CAMS双参数方案能够模拟出与CloudSat卫星实测资料相似的冰粒子含水量和数浓度大值区的垂直分布特征,Ncepcloud3和Ncepcloud5模拟结果更强,并且,不包含冰粒子数浓度;初步分析了微物理方案模拟差异的原因,在对流系统初始阶段,模拟差异主要由动力过程产生,在对流系统发展成熟阶段,微物理过程对模拟结果有重要影响。

英文摘要：

The convective parameterization and microphysical scheme are two main approaches in a mesoscale atmospheric model to describing cloud and precipitation processes.When the grid scale of the model is small enough to distinguish the convective cloud scale,the microphysical scheme becomes more important.In this study,a case of heavy rainfall of Meiyu front happened on July 7-9,2007 in China is simulated using the GRAPES mesoscale model.The effects of the different microphysical schemes（the Ncepcloud3 simple ice scheme,the Ncepcloud5 mixed phase scheme,the CAMS double moment mixed phase scheme） on heavy rainfall simulating are analyzed combining with the observations of precipitation,the radar echoes and hydrometeors patterns.The results show that for this heavy rainfall case,the simulations using the CAMS scheme are better for the classes of light rain and moderate rain,and the Ncepcloud3 scheme and the Ncepcloud5 scheme are of higher TS for the torrential rain and the class above it.The maximum of the heavy rainfall center simulated using the CAMS scheme is close to the observation.The simulated results of mesoscale convective system developing processes are different using these schemes from each other.The area of weak convective echoes simulated by the Ncepcloud5 scheme is small.The CAMS scheme simulated a bigger area of weak convective echo which is basically consistent with observations.The vertical distributions of the mass content and number concentration of ice particles calculated by the CAMS dual parameters scheme are similar to the CloudSat observations.The ice particles calculated by the Ncepcloud3 scheme and Ncepcloud5 scheme are larger than the observation with no number concentration of theirs covered.The reasons of the simulative difference caused by using different schemes are preliminarily analyzed.During the forming stage of convective system,the simulative difference is mainly produced by dynamical process.While during both the developing and mature stage,the microphysical processes affect sim