南京仙林地区近地表消光系数变化及影响因素研究  

Variation Characteristics and Influencing Factors of Extinction Coefficient in Xianlin Area of Nanjing

作　　者：吴万宁[1] 查勇[1] 王强[1] 贺军亮[1] 包青[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023

出　　处：《环境科学与技术》2014年第12期106-111,共6页Environmental Science & Technology

基　　金：国家重大科学研究计划项目(2014CB953802)

摘　　要：利用设置在同一地点的气象仪器、大气颗粒物监测仪以及532 nm米散射激光雷达进行为期14个月的同步观测。采用Fernald方法反演得到不同高度的气溶胶消光系数,得出了南京仙林地区不同高度消光系数的小时变化曲线、全年垂直廓线、不同季节不同高度消光系数小时变化曲线以及不同季节消光系数垂直廓线。结果显示除夏季外别的季节近地表大气不同程度受到逆温层影响。不同季节不同高度的消光系数日变化有差异,由于对流作用强,夏季2 km高度消光系数日变化非常小。近地表消光系数和PM2.5相关性达0.68,湿度以及温度通过影响PM2.5的形成进而影响消光系数。亚热带季风气候对于城市大气污染影响显著。降水可以有效降低城市大气污染水平。This paper conducted a 14 months atmospheric observation based on the meteorological instruments, atmospheric particulate matter monitors and 532 nm Mie lidar which were set in the same place. Fernald method was used to retrieve different heights of aerosol extinction coefficient, after that hourly curve of extinction coefficient at different heights, annual vertical profile, extinction coefficient of different seasons at different heights and hourly curve of extinction coefficient vertical profiles in different seasons were presented. Results showed that near-surface atmosphere was affected by temperature inversion at varying degrees in the other seasons except summer. The diurnal variation of the extinction coefficient was different at different heights in different seasons. Since the role of strong convection current in summer, it has little changes of extinction coefficient at 2 km height. The correlation coefficient of near-surface extinction coefficient and PM2.5was 0.68.Humidity and temperature affected the extinction coefficient by influencing the concentration of PM2.5. Extinction coefficient increased with humidity rise. Subtropical monsoon climate affected the urban air pollution significantly. Precipitation can effectively reduce the levels of urban air pollution.

关 键 词：气溶胶 消光系数 PM2.5 南京 

分 类 号：X513[环境科学与工程—环境工程]