摘要
利用2012年夏季太原大气成分观测站黑碳仪、浊度仪、颗粒物监测仪的监测资料,运用统计分析方法分析了该地区气溶胶的散射和吸收特性。结果表明:2012年夏季,太原散射系数、吸收系数和消光系数小时平均值分别为(448.5±323.5)、(93.6±65.6)和(548.1±383.4)Mm^(-1)。在该地区气候特征、大气低层物理过程及人类活动的共同影响下,散射系数、消光系数日变化特征表现为单峰型,而吸收系数表现为双峰型。3个系数与PM_(2.5)和PM_(1.0)质量浓度有较好的相关性,特别是消光系数与PM_(2.5)质量浓度的相关系数达到0.93。通过比较PM_(2.5)和PM_(1.0)平均质量浓度散射效率、吸收效率和消光效率,得出小粒径粒子对3个系数的影响比大粒径粒子更明显。通过拟合3个系数小时均值最大出现频率,得出该地区3个系数本底值分别为252.3、59.2和287.2 Mm^(-1)。
Based on the data collected during summer of 2012 by using ethalometer, nephelometer and ambient-particulate monitor at Taiyuan atmospheric station, statistical analysis of the characteristics of aerosol scattering and absorption coefficients was conducted. The analysis results showed that average scattering coefficient, absorption coefficient and extinction coefficient were（448.5 ±323.5）,（93.6 ±65.6） and（548.1 ±383.4） Mm^（-1）,respectively. Affected by climatic characteristics,physical process of the lower atmosphere layer and the human activities,the diurnal variations of scattering coefficient and extinction coefficient were of single-peak type,while the diurnal variations of absorption coefficient doublepeak type. Fairly good correlations of scattering coefficient,absorption coefficient and extinction coefficient with PM_（2.5）,PM_（1.0）mass concentrations were noted,especially the correlation coefficient of extinction coefficient to PM_（2.5）which attained to0.93. Comparative study of PM_（2.5）and PM_（1.0）in regard to the mass scattering efficiency,absorption efficiency and extinction efficiency suggested that the smaller size particles had higher scattering efficiency,absorption efficiency and extinction efficiency than the larger one. Additionally,the background values of the scattering coefficient,absorption coefficient and extinction coefficient were 252.3,59.2 and 287.2 Mm^（-1）,respectively,which were calculated by fitting the values of hourly frequency distribution.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第12期6-10,49,共6页
Environmental Science & Technology
基金
中国科学院战略性先导科技专项(XDB05030100)
山西省气象局2014年一般课题项目(SXKYBDQ20147813)
关键词
散射系数
吸收系数
消光系数
scattering coefficient
absorption coefficient
extinction coefficient
