南京市生活区夏秋季节大气颗粒物垂直分布特征

Vertical Distribution Characteristics of Atmospheric Particles in Summer and Autumn in Nanjing

文章实验研究了2008年7月24日-28日(夏季)和2008年10月13日-17日(秋季)南京市河西生活区距地面1.5 m、54 m和80 m高度处大气颗粒物质量浓度垂直分布特征。夏季和秋季监测结果的对比分析表明:随着高度的增加,采样期间夏季和秋季的PM10和PM2.5平均质量浓度均呈现逐渐减小的趋势,其中秋季衰减幅度明显比夏季小,而且秋季采样期间PM10和PM2.5平均质量浓度远远高于夏季;另一方面,夏秋两季不同尺度颗粒物浓度的相对含量也发生了明显变化,相比于夏季1.5 m高度处秋季细颗粒物的所占比例明显增加,而80 m处却明显降低。

The vertical distribution characteristics of atmospheric particles mass concentrations at the height of 1.5 m,54 m and 80 m in Hexi uptown of Nanjing during July 24 to 28 （summer） and October 13 to 17 （autumn） in 2008, have been experimentally investigated in this paper. By means of comparison and analysis of the monitoring results in summer and autumn, which indicated that： with the increasing of height, the average mass concentration of PM10 and PM2.5 both presented decreasing trends during the sampling period. The attenuation extent in autumn was smaller than that of summer obviously, and also the average mass concentration of PM10 and PM2.5 was much higher. On the other hand,the relative content ratio of various particles mass concentration with different scale changed dramatically in both seasons. In particular, the proportion of the fine particles at the height of 1. 5m increased evidently in autumn, while it decreased remarkably at the height of 80 m.