江淮梅雨锋强暴雨低涡系统发生发展的数值研究  

Numerical Study on the Genesis and Development of the Low Vortex-rain Gush System on a Jianghuai Meiyu Front

作　　者：马旭林[1] 刘还珠 薛纪善[3] 王盘兴[1] 

机构地区：[1]南京气象学院大气科学系,江苏南京210044 [2]国家气象中心,北京100081 [3]中国气象科学研究院,北京100081

出　　处：《南京气象学院学报》2004年第3期347-355,共9页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金重点项目(40233036);国家"十五"科技攻关计划项目(2001BA607B)

摘　　要：利用美国新一代中尺度WRF(WeatherResearchandForecast)模式,采用高分辨率的细网格距和适当的物理方案,对2003年7月4—5日的江淮梅雨锋强暴雨中尺度系统进行了数值模拟研究。模拟结果很好地描述了本次暴雨及其中尺度系统发生、发展的时空演变过程,并较理想地预报出了该次降水的落区、强度及降水中心的位置。着重分析了低空急流、倾斜不稳定发展及中尺度低涡系统和对流层高层小扰动,并进一步指出了其形成、发展的物理机制。从数值模拟分析结果看,倾斜垂直涡度的发展是造成低空涡旋生成和发展的动力机制。充足的湿有效能量和凝结潜热的释放为本次大降水过程提供了物质条件。Using the new generation mesoscale model of Weather Research and Forecast (WRF),with the high resolution grid points and the suitable physical schemes,the numerical simulation of the rain gush of the Jianghuai Meiyu front during 4th-5th July 2003 is carried out.Simulated results show that the rain gush and the genesis and development of the mesoscale system are well described,and the distribution,intensity and center location of the precipitation are successfully forecasted.The low-level jet,slantwise instability development,and the mesoscale low vortex system and the perturbation in the upper troposphere are analyzed,and it is found from the simulated results that the development of tilted vertical vorticity is the dynamical mechanism for the genesis and development of the low-level vortex.The sufficient moist available potential energy and latent heat release offer the material condition for this heavy rain event.

关 键 词：WRF模式 数值模拟 低涡系统 江淮梅雨 湿有效能量 

分 类 号：P458.121.1[天文地球—大气科学及气象学]