Numerical Simulation of Convective Clouds and Boundaries

采用COMMAS和MM 5模式的数值模拟研究大气中的对流现象，特别强调内部或外部生成的边界的现象。 研究内容包括：（1）沿着干线的对流起始;（2）锋面、外流边界、云边界和低空急流在1996年7月17-18日芝加哥洪水中的重要性;（3）风暴与低空边界相互作用的动力学和热力学;（4）1996年4月19日在伊利诺斯州及其邻近州爆发的龙卷风。这些研究结果为大气环流系统提供了基本的见解，并为预测严重天气事件提供了指导。

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.