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$BBj!!L\!'(BNocturnal Development of Mesoscale cloud clusters in Eastern China during Meiyu Period
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Nocturnal Development of Mesoscale cloud clusters in Eastern China during Meiyu Period ($BM{(B $BC]6G(B) $BH/I=MW;](B :
Mesoscale cloud cluster is the important complex convective systems that owns large area rang and long lasting time, it can produce heavy rainfall and have great effect on energy and water cycle. It was found that the evolution of mesoscale cloud cluster shows regularity in its convection peak time in one day time (which named diurnal variation of mesoscale cloud cluster here). In North America Continent, the convection of cloud clusters was found by some researchers to tend to peak at night time, we also found a significant diurnal variation in the evolution of cloud clusters in Eastern China continent during Meiyu Period, most of them developed largely around 2 LST in night time with a secondary convection peak in evening time in a few cases. To study the diurnal variation of mesoscale cloud cluster and the main factors and dynamical process that reslt in its prominent midnight convection peak can contribute to the knowledge on the mechanism of the largely develpment of cloud cluster and the prediction on its evolution. In Eastern China, a quasi-stationary east-west-oriented Meiyu front exist during Meiyu Period, most of the cloud cluster we analyzed occurred along the Meiyu front , the benifit environment for the midnight convection peak of cloud clusters was mainly analyzed in this study. The nocturnal enhanced low level northward wind over large domain south to Meiyu Front, and the resultant water vapor flux convergence over Meiyu front zone was proposed to dominantly contribute to the midnight convetion peak of mesoscale cloud clusters.
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