利用NCEP FNL资料、FY-2E 云顶亮温、常规观测及加密自动站降水量等资料, 以及高分辨率中尺度模式WRF V3.3的模拟结果, 结合对流涡度矢量方程对2011年6月一次江淮梅雨锋暴雨过程进行了诊断分析。结果表明, 模拟结果再现了该次暴雨过程的降水特征, 该过程主要受地面低压及梅雨锋锋面系统的控制和影响, 其中6月14-15日为所选暴雨个例最旺盛的阶段, 且该时段伴随梅雨锋上中尺度对流系统的移动发展和梅雨锋锋生。对流涡度矢量及其垂直分量的倾向方程的诊断分析表明, 对流涡度矢量垂直分量的局地变化主要受非绝热加热项的影响; 而非绝热加热与次级环流和梅雨锋锋生的关系说明中尺度对流活动与梅雨锋锋生存在类CISK机制的反馈关系。因此, 对流涡度矢量, 特别是其垂直分量可以用来诊断和揭示伴随非绝热加热的中尺度对流系统与梅雨锋锋生之间的关系。
Using NCEP FNL analysis data, black body temperature from FY-2E satellite, conventional and auto-metrological stations' observational precipitation data, and simulation output from high-resolution mesoscale model WRF V3.3 to analyze a precipitation process in Jiang-Huai valley in June 2011. Analysis results show that the simulation results are in good agreement with the observations when comparing the precipitation between simulations and observations and reproduce the precipitation process well. This precipitation process was controlled and influenced by the surface low and Meiyu front systems. Period from 14 to 15 June is the mature phase of whole precipitation process, and the most significant character of this period is that many mesoscale convective systems move and develop along the Meiyu front. To investigate how MCS impacts on Meiyu front and torrential rainfall, convective vorticity vector and its vertical component tendency equation were employed to analyze. The result shows that local variation for the vertical component was influenced by the diabatic term, and the relationships among diabatic heating, secondary circulation and Meiyu frontogenesis imply a CISK-like response between MCS and Meiyu frontogenesis. So as a good atmospheric variable, the convective vorticity vector, especially, the vertical component can be used to diagnose and reveal the relationship between MCS associated with diabatic heating and Meiyu frontogenesis.
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