一例苏皖中尺度对流复合体模拟结果的诊断分析  

Diagnostic Analysis of Simulation Results of a Mesoscale Convective Complex in Jiangsu and Anhui

作　　者：朱娟 赵艳玲 刘赛赛 张铭[3] Zhu Juan;Zhao Yanling;Liu Saisai;Zhang Ming(Office for Constructing Zhangzhou Base of National Narine Technology Center,Beijing 100088,China;The PLA.31010 Units,Beijing 10008,China;Significant Weather Monitoring and Early Warning Research Center of the Whole Army,College of Meteorology and Oceanography,National University of Defense Technology,Nanjing 211101,China)

机构地区：[1]国家海洋技术中心漳州基地筹建办公室,北京100088 [2]解放军31010部队,北京100081 [3]全军危险性天气监测预警研究中心,国防科技大学气象海洋学院,江苏南京211101

出　　处：《气象与减灾研究》2020年第3期187-193,共7页Meteorology and Disaster Reduction Research

摘　　要：利用2010年7月22日苏皖中尺度对流复合体(MCC)数值模拟输出结果,考察了模式对MCC的模拟能力,并对模拟结果做了动力和热力诊断分析,以揭示盛夏江淮下游MCC的特征。结果表明:1)三重嵌套网格距为3.3 km的区域WRF模式的模拟效果较佳,结果与实况一致,并可利用模拟降水的范围及强度来确定MCC的位置及演变。2)此MCC维持约10 h,其南北不对称,并随西太平洋副热带高压西伸北抬而随之北抬。MCC核心区对流层低层有水汽丰沛的入流,并有强辐合区,呈对流不稳定层结;中层有深厚的强上升运动,并因凝结潜热大量释放呈中性层结;高层则有出流;MCC核心区对流降水非常强。3)在垂直剖面上,该核心区散度存在中低层辐合、高层辐散的柱状结构,此配置有利于强对流维持和加强,中低层以上有深厚的强上升气流柱,这些都是MCC核心区存在强对流的标志。该MCC的螺旋结构表明其中的强对流高度有组织。In this paper,a numerical simulation of the mesoscale convective complex(MCC)in Jiangsu and Anhui on July 22,2010 was carried out,the performance of the model to simulate MCC was evaluated,and the dynamic and thermal diagnosis analysis of the simulation results was also made,to reveal the characteristics of MCC in the lower reaches of the Yangtze and Huaihe River in midsummer.The results showed that:the WRF mode with a triple nested fine grid of 3.3 km presented a strong simulation capability for the MCC,and the simulation results were consistent with the reality.The range and intensity of precipitation can be used to determine the position and intensity of the MCC.The MCC maintained for about 10 hours and was asymmetrical between north and south.The MCC went northward as the West Pacific subtropical high extending westward and northward.In the core area of the MCC,there was abundant inflow of water vapor and a strong convergence area in the low level of the troposphereis,and exhibted unstable convection stratification;on the middle level,there was a deep strong rising motion,and presented neutral stratification,which was caused by the massive release of convection condensation heating;on the higher level there was outflow and the convective precipitation was very strong in the core area of the MCC.There was convergence in the middle and low levels of the core area and divergence in the higher level of the core area in the vertical section.This configuration was conducive to the maintenance and strengthening of strong convection.There were deep and strong updraft columns in the middle and low levels,which were the signs of strong convection in the core area of MCC.The helical structure of MCC indicated that the strong convection in it was highly organized.

关 键 词：MCC 诊断分析 强对流 WRF模式 

分 类 号：P435[天文地球—大气科学及气象学]