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中文摘要：
利用实况资料和中尺度WRF模式对2007年7月9—10日一次江淮梅雨期暴雨过程进行了数值模拟与诊断分析。结果表明,此次过程中,在雨带的北部有β中尺度小高压的维持及破坏过程。在小高压维持时,暴雨相对较小,被破坏时,降水加强,同时中层有明显的锋生过程。β中尺度高压产生与消失的原因与高空急流的非地转质量调整有关。小高压存在时有利于梅雨锋切变线的维持,但其南部的偏东气流,没有为暴雨提供较强的辐合场,且阻挡了北方的冷空气南下,因此不利于强降水的产生。当其减弱消失时,使得北方的动量直接指向暴雨区,有利于辐合上升运动的加强,从而强降水发展加强。最强锋生、降水以及有效位能出现在小高压被破坏后。利用锋生函数计算得出,暴雨时,中层的水平辐散项与变形项对锋生的影响明显。通过湿位涡的计算发现其对低层锋生和降水的预报有着一定的指示和预报意义。
英文摘要：
A Meiyu heavy rainfall case during 9—10 July 2007 is simulated and analyzed in this paper by using the meso-scale WRF model and real time data.The result shows that the maintenance and destruction of the meso-β-scale high happened in the northern part of the rainband during this period of time.The rain was relatively small when meso-β-scale high maintained and then it strengthened after the destruction of meso-β-scale high.Meanwhile,significant frontogenesis occurred in the middle layer.The reason for the formation and disappearance of the meso-β-scale high has much to do with the ageostrophic mass adjustment of upper-level jet stream.The existence of meso-β-scale high is beneficial for the shear line on Meiyu front,but the eastward airstream in the south of the high-pressure did not supply the convergence field for precipitation and block the cold air from the north.The heavy rain occured because the momentum of the north can directly move to the rainstorm zone when meso-β-scale high was fading away.By using the vector frontogenetic function,it is found that the effects of transfiguration as well as the divergence item on frontogenesis function have obvious impact on the frontogenesis.The strongest frontogenesis,precipitation and CAPE appeared after the destruction of the meso-β-scale high.The influence of MPV to precipitation and the frontogenesis at the lower level is an important factor for the rain-fall forecasting.
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