Numerical Simulation of Convective Clouds and Boundaries

使用COMAS和MM5模式的数值模拟被用来研究大气中的对流现象，特别是具有内部或外部产生的边界的现象。研究内容包括：(1)沿干线的对流启动；(2)锋面、出流边界、云边界和低层急流在1996年7月17-18日芝加哥洪水中的重要性；(3)风暴与低层边界相互作用的动力学和热力学；(4)1996年4月19日伊利诺伊州及邻近各州的龙卷风爆发。这些研究结果为大气环流系统提供了基本的见解，并为预报恶劣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.