Abstract:Surface ozone concentration was measured at four stations in Beijing area, which are located along the route of prevalent wind, from June to September 2007. During the experiment period, the local circulation – mountain and valley breeze was prevalent in Beijing. The community multiscale air quality model (CMAQ) was applied simulating a typical case to validate the influence of transportation of ozone from urban to rural area. Both the maximum average O3 concentration and the highest frequency of 1h O3 mixing ratio exceeding 102×10-9 was observed at the urban-downwind, regional background station, whereas the lowest frequency appeared at the urban-upwind station. The peak hourly ozone concentration of up to 271.56×10-9 was captured at the downtown station. The patterns of ozone diurnal variations were similar at the different stations. The peak time of hourly ozone concentration lagged along the city-to-downwind route. O3 concentration observed under the prevalent wind conditions increased along the route of wind direction. The difference in O3 concentration between the two prevalent wind directions (SW and NE) also increased along the route of SW wind direction. O3 concentration at the regional background station was affected by different air masses from the clean and polluted areas. The contribution of the city-to-downwind transport to regional background O3 was estimated to be 36.7×10-9. Simulated results validated the influence of O3 transportation from urban to the downwind areas.
徐敬, 张小玲, 赵秀娟, 徐晓峰, 孟伟. 夏季局地环流对北京下风向地区O3输送的影响[J]. 中国环境科学, 2009, 29(11): 1140-1146.
XU Jing, ZHANG Xiao-Ling, ZHAO Xiu-Juan, XU Xiao-Feng, MENG Wei. Influence of summer local circulation on the transportation of ozone from urban to the downwind area in Beijing.. CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(11): 1140-1146.