中文摘要：

基于拉格朗日混合单粒子轨道（HYSPLIT）模型内核，采用客户端／服务器（C／S）架构搭建大气污染物扩散预报系统。当突发性大气污染事件发生时，可以利用该系统对污染物输送轨迹和扩散趋势进行即时模拟预报。该系统较好地模拟了2015年天津“8·12”危险化学品仓库爆炸事件的污染物输送轨迹和扩散趋势，表明此次爆炸事件产生的污染物主要向渤海湾方向输送；污染物主要以水平输送为主，垂直输送很弱；随着污染扩散时间的持续，各高度的污染物在水平输送方向上差异明显。

英文摘要：

Atmospheric pollutant diffusion forecast system was built,based on hybrid single particle Lagrangian integrated trajectory （HYSPLIT） model and client/server （C/S） architecture programming. When sudden pollution incident happened, this system could be used to simulate the transport trajectory and diffusion tendency of atmospheric pollutant in real time. This systerm could well simulate transport trajectory and diffusion tendency of atmospheric pollutant after ＂8 · 12＂ hazardous chemical explosion event in Tianjin in 2015, indicating that the pollutants were mainly transported to Bohai Bay. In addition, the pollutants were mainly composed of horizontal conveying and their vertical transport was very weak. Horizontal conveying of pollutants in each layer differed obviously with the exten- sion of pollutant diffusion duration.