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Numerical Simulation of Torrential Rainfall and Vortical Hot Towers in a Midlatitude Mesoscale Convective System

【摘要】:A cloud-resolving model simulation of a mesoscale convective system (MCS) producing torrential rainfall is performed with the finest horizontal resolution of 444 m.It is shown that the model reproduces the ob-served MCS,including its rainfall distribution and amounts,as well as the timing and location of leading rainbands and trailing stratiform clouds.Results show that discrete convective hot towers,shown in Vis5D at a scale of 2 5 km,are triggered by evaporatively driven cold outflows converging with the high-θ e air ahead.Then,they move rearward,with respect to the leading rainbands,to form stratiform clouds.These convective towers gener-ate vortical tubes of opposite signs,with more intense cyclonic vorticity occurring in the leading convergence zone.The results appear to have important implications for the improvement of summertime quantitative precipi-tation forecasts and the understanding of vortical hot tow-ers,as well midlevel mesoscale convective vortices.

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