城市低层大气臭氧生成的模拟研究

利用一个城市边界层臭氧模式，以南京市为对象，研究了臭氧在城市低层大气中的形成机制和规律，得出了南京市18个交通点的日臭氧浓度最大值的分布图。结果表明，南京市白天有相当长的时间是处于臭氧超标的状态，不少交通点的日最大臭氧浓度值是标准的2－3倍。文章还模拟了PAN，OH自由基和HCHO这三种重要物种的日变化规律。同时，本文选择南京市东郊的紫金山风景区，实次探讨了植物排放有机物对臭氧生成的贡献。从模式的模拟研究可得，与人为因素相比，植物排放对臭氧生成的作用也是不可忽视的，值得作深入一步的探讨。

SIMULATION OF THE FORMING OF OZONE IN THE LOW LAYER AIR OF URBAN AREA

A city PBL ozone forming model is used to simulate the forming of ozone in the low layer air in urban area using Nanjing city as a case study.To each of the 18 transport crosses,the maximum of ozone concentration is estimated.The results show that the concentrations of ozone are beyond the standard for rather long time during the daily time in Nanjing city.Some of the maximum daily ozone concentration is 2-3 times the standard.We also simulated the daily changes of PAN,OH and HCHO.Meanwhile,the ZiJin Mountain is studied as a case to discuss the distribution of the biogenic hydrocarbon emissions to the forming of ozone.It is suggested that as to the forming of ozone,the effect of biogenic hydrocarbon emissions can not be ignored as well as anthropogenic hydrocarbon emissions,it needs further research.