收稿日期: 2013-03-04
修回日期: 2013-05-03
网络出版日期: 2013-11-15
基金资助
国家环境保护公益性行业科研专项(201009001)资助
Seasonal characterization of particle extinction coefficient and its relation with PM2.5 mass concentration in Chengdu
Received date: 2013-03-04
Revised date: 2013-05-03
Online published: 2013-11-15
为进一步了解成都城区霾天气成因,收集2011年成都城区大气细颗粒物(PM2.5)质量浓度,以及同步的颗粒物散射系数(bsp)和颗粒物吸收系数(bap)资料,探讨bsp和bap季节和日变化特征,以及大气消光系数(bext=bsp+bap)与PM2.5之间关系.结果发现,成都城区bsp和bap年均值分别为(456±237) Mm-1和(96±73) Mm-1,其中bsp日变化主要受到气象条件和郊区污染源输送的影响,bap日变化主要受到气象条件和本地移动源的影响.PM2.5与bext呈现较好的线性关系(R2>0.92),表明PM2.5是导致成都霾天气的主要因素.
宋丹林 , 陶俊 , 张普 , 周子航 , 李从庆 , 周来东 . 成都城区颗粒物消光系数特征及其与PM2.5的关系[J]. 中国科学院大学学报, 2013 , 30(6) : 757 -762 . DOI: 10.7523/j.issn.2095-6134.2013.06.007
Daily PM2.5 samples were collected in Chengdu for a period of one month in each of the seasons of 2011. Particle scattering coefficient and particle absorption coefficient were synchronously measured. The seasonal and daily variations in bsp and bap and the relation between bext (bsp+bap) and the PM2.5 mass concentration was discussed based on above-measured data to investigate the causes of hazy weather. The results show that the annual bsp and bap values were (456±237) Mm-1 and (96±73) Mm-1, respectively, and that daily variation in bsp was influenced by metoroligical factors and transpotation of polltants from Chengdu suburban while daily variation in bap was influenced by metoroligical factors and local motor emission in the urban aera. Good correlation between PM2.5 and bext was found (R2>0.92), which suggests that the higher PM2.5 concentration is the key impact factor for hazy weather.
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