南京大气气溶胶理化特性对其消光系数的影响机制研究

项目名称： 南京大气气溶胶理化特性对其消光系数的影响机制研究

项目编号： No.41475142

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 于兴娜

作者单位： 南京信息工程大学

项目金额： 98万元

中文摘要： 大气气溶胶污染已成为一个严重的环境问题，特别是近年来霾天气的频发严重影响大气能见度和人体健康。然而，此污染条件下气溶胶理化特征对其光学性质影响的研究甚少。本项目拟利用双电迁移性颗粒物吸湿粒径分析仪（H-TDMA）、宽范围颗粒粒径谱仪（WPS）、离子色谱仪（IC）、碳分析仪、浊度仪和黑碳仪等在线-离线监测仪器，在南京清洁和污染天气下开展气溶胶数谱分布、化学组成、吸湿增长及光学性质的同步观测研究，识别实际大气气溶胶的理化特征和环境条件与其光学性质的关系，分析探讨理论与观测的气溶胶吸湿性参数的差异机制，明确不同污染条件下气溶胶粒子的吸湿特性；进而揭示气溶胶粒径谱-化学组分-吸湿增长对其消光系数的影响。本研究结果可丰富气溶胶理化特性对大气能见度影响的深入认识，也为评估气溶胶辐射强迫提供更多更细致的数据支撑，并为长三角大气污染控制、空气质量和大气能见度改善提供科学依据。

中文关键词： 气溶胶；化学组分；粒径分布；吸湿增长；消光系数

英文摘要： The aerosol pollution has been a serious environment problem, especially the occurrence of haze. The serious haze has an important impact on visibility and human health. However, the observation study on the effect of aerosol physical and chemical characteristics on its optical properities for hazy days is far from completeness. The aerosol size distribution, chemical composition, hygroscopic growth and optical properties will be launched by using online-offline instrument, such as the H-TDMA, WPS, IC, OC/EC analyzer, integrating nephelometer and aethalometer during clean and polluted episodes in Nanjing. The relationship between physical and chemical characteristics, ambient environment conditions and optical properties can be clarified. The difference mechanism between theoretical and measured aerosol hygroscopicity parameters will be discussed. The hygroscopicity properties of aerosol particles in the different pollution conditions will be presented. And then, the effect of size distribution, size-resolved chemical composition and hygroscopic growth on its extinction coefficients can be revealed. After finished the research, the knowledge of the influence of aerosol physical and chemical characteristics on the visibility will be enriched, the detailed data will be provided for the assessment of aerosol radiative forcing, and the scientific evidence will be offered for the control of air pollution, the improvement of air quality and the visibility in the Yangtze River Delta.

英文关键词： aerosol;chemical composition;size distribution;hygroscopic growth;extinction coefficient