浙江金华秋季干气溶胶中主要化学组分的消光贡献解析

发布时间：2018-04-23 13:07

  本文选题：PM + 有机气溶胶　； 参考：《环境科学学报》2017年11期

【摘要】：造成雾霾事件的主要原因是高浓度的大气细颗粒物污染.为了深入研究大气细颗粒物的消光来源,本研究采用高时间分辨率气溶胶观测仪器获得了浙江金华秋季PM1主要化学组分浓度及干气溶胶吸收系数和散射系数演变情况.结合有机气溶胶正矩阵因子解析模型(PMF)和多元线性回归方法,建立了拟合优度很高(R2=0.977)的细颗粒物中主要化学组分与干气溶胶消光系数间的定量关系模型.结果表明,观测期间消光贡献最大的是硫酸铵,贡献率为35.1%;其次是硝酸铵,贡献率为26.7%;二次有机气溶胶(SOA)、生物质燃烧有机气溶胶(BBOA)、黑碳(BC)及氯化铵的消光贡献率分别为14.3%、11.2%、8.7%、4.0%.在一些特定污染时段,BBOA具有最大的消光贡献,是导致此时大气能见度大幅度衰减的首要因子.
[Abstract]:The main cause of haze event is high concentration of atmospheric fine particles pollution. In order to study the sources of extinction of atmospheric fine particles, the evolution of the concentration of main chemical components of PM1 and the absorption and scattering coefficients of dry aerosols in Jinhua, Zhejiang Province in autumn were obtained by using a high time resolution aerosol observation instrument. Combined with the analytical model of positive matrix factor of organic aerosol (PMF) and the multivariate linear regression method, a quantitative relationship model between the main chemical components of fine particulate matter and the extinction coefficient of dry aerosol was established. The results showed that the extinction contribution of ammonium sulfate was the greatest in the observed period, with a contribution rate of 35.1cm, followed by ammonium nitrate with a contribution rate of 26.7; the extinction contribution rate of the secondary organic aerosol, the biomass combustion organic aerosol BBOAA, the black carbon BCC) and the ammonium chloride were 14.311.28.70.The extinction contribution rates of the secondary organic aerosol were 14.311.28.7 and 4.0, respectively. BBOA has the greatest extinction contribution in some specific pollution periods and is the primary factor leading to the large attenuation of atmospheric visibility at this time.
【作者单位】： 北京大学深圳研究生院环境与能源学院城市人居环境科学与技术实验室;浙江省环境监测中心;
【基金】：国家自然科学基金(No.41622304) 深圳市科技计划~~
【分类号】：X513
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本文编号：1792099