南宁市SO_2浓度分布特征及其与气象条件的关系

THE RELATIONSHIP BETWEEN SO_2 DISTRIBUTION AND METEOROLOGICAL FACTORS IN NANNING CITY

本文生要阐述了南宁市区SO_2浓度的水平分布状况和变化规律,并利用同期的气象资料,详细分析了不同的气象条件对南宁市区上空SO_2浓度分布和变化的影响。结果表明:(1)风速与SO_2浓度关系密切;(2)风向对SO_2污染物具有引导作用;(3)大气稳定度和混合层高度对SO_2的扩散和稀释有着较大的影响;(4)城区西部区木材厂和南部有机化工厂一带,SO_2浓度较大,该区气象条件对SO_2浓度影响也较为重要。此外,本文通过对气象因子与SO_2浓度的回归统计分析,提出了一些SO_2污染的临界气象指标,作为该城区上空SO_2污染预测预报的参考依据。

The level distribution and changes of SO_2 in Nanning city have been investigated. The effects of meteorological factors on distribution and changes of SO_2 have been analysed. The results are as follows: 1) SO_2 concentration is closely related to wind speed; 2) SO_2 pollutant is led by the most frequent wind direction. 3) The stability of atmosphere and the height of air mixing layer have significant effects on diffusion and dilution of SO_2; 4) In the west and south of the city,the concentration of SO_2 is higher than that in other areas because of the Wood Factory in the west and the Organic Chemical Factory in the south, and the meteorological conditions. Besides, several meteorological threshold indexes have been suggested based on the regression analyses of meteorological factors on SO_2 concentration, which might be referable for the forecast of SO_2 pollution in this city.