本研究利用正定矩阵因子分析（PMF）和Mie理论的耦合模型对气溶胶光散射来源进行了分析。燃煤、工业和机动车是南京市能见度下降最大污染源，它们对能见度下降的贡献为64 %-70 %。对比清洁状态和污染状态的解析结果，结果发现机动车及工业源所排放的一次颗粒物分别是市区和工业区能见度降低的主要因素。此外，二次气溶胶对能见度降低的影响也不容忽视。
A coupled model of positive matrix factorization (PMF) and the Mie theory was developed and applied for the source apportionment of aerosol light scattering. Coal burning, industry and vehicles were identified as the major sources of the reduced visibility in Nanjing, with an estimated collective contribution at 64%-70%. The comparison between the clean and polluted period suggested that the increased primary particle emissions from vehicles and industry were the major causes of the visibility degradation in urban and industrial regions, respectively. In addition, secondary aerosols were a great contributor to the reduced visibility.
Congratulations to Chen Dong!
Source apportionment of accumulation mode particles at NJU (a), PAES (b) and NUIST (c) and source apportionment of light scattering for accumulation mode particles at NJU (d), PAES (e) and NUIST (f). The shadow represents the contribution of secondary aerosols from each source category.