基于AERMOD2.2的兰州大学交通尾气污染模拟分析

Simulation Analysis of Traffic Exhaust Pollution in Lanzhou University Based on AERMOD2.2

以兰州大学校园附近两条主要交通干道排放的汽车尾气污染源成分中的碳氢化合物(NMHC)和氮氧化物(NOx)为研究对象,利用AERMOD2.2中的线源模式,模拟了两种污染物在兰州大学校园内的年均浓度贡献值。结果表明:兰州大学校园内接近线源的地方污染较严重,且两条主要交通干道受NOx的污染较大,受NMHC的污染较小。另外,介绍了不同线源模式的计算方法,并从气象资料预处理、背景图选取、方案控制和污染源设置等方面探讨了使用AERMOD2.2应注意的问题、重点和技术要点,以期为今后利用AERMOD模式预测具体线源上目标污染物对区域大气环境质量的影响提供参考和借鉴。

This paper takes Lanzhou University campus as an example,takes the traffic exhaust on the two main roads close to the campus as the sources of pollution,takes hydrocarbons （NMHC） and nitrogen oxides （NOx） as research objects and adopts the line source model in AERMOD2.2 to simulate the pollution contribution of different sites to the average annual concentration of the two pollutants in Lanzbou University campus. The results show that in the sites close to the two main roads the pollution is quite serious, and NOx pollution is more serious than NMHC pollution. The paper also introduces the calculation methods of different line source models and explores the problems and key technical points of AERMOD2.2 model from the pretreatment of meteorological data, the selection background image, program control, the setting of pollution sources and other aspects, with a view to provide the reference for future using AERMOD model to predict the impact of target pollutants in the specific line source on the environment quality of regional atmosphere.