Numerical Simulation of Convective Clouds and Boundaries

采用COMMAS和MM5模式的数值模拟用于研究大气中的对流现象，特别强调具有内部或外部生成边界的现象。研究内容包括：(1)沿干线对流起生；(2) 1996年7月17-18日芝加哥洪水锋面、外流边界、云边界和低空急流的重要性；(3)低边界层下风暴相互作用的动力学和热力学；(4) 1996年4月19日在伊利诺斯州及邻近各州爆发的龙卷风。这些研究结果提供了对大气环流系统的基本认识和对恶劣天气事件预报的指导。

Numerical simulations employing the COMMAS and MM5 models are employed for investigating convective phenomena in the atmosphere, with special emphasis on phenomena with internally or externally generated boundaries. The research includes the following topics:(1) convective initiation along drylines;(2) the importance of fronts, outflow boundaries, cloud boundaries, and the low-level jet in the Chicago flood of July 17-18, 1996;(3) dynamics and thermodynamics of storm interactions with low-level boundaries;(4) the tornado outbreak of April 19, 1996, in Illinois and adjacent states.Results of these studies provide fundamental insight on atmospheric circulation systems and guidance for forecasting severe weather events.