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研究报告

Characterization of aerosol particles during a haze event in the Northern Suburb of Nanjing

摘要：本研究利用单颗粒飞行时间气溶胶质谱仪（SPAMS）、宽范围粒径谱仪（WPS）并结合气象数据对南京北郊一次霾过程中气溶胶的理化特征变化进行了分析。结果表明观测期间风向变化导致的气溶胶来源变化是大气能见度变化的主要原因。最低大气能见度出现在西北气团控制期间，其次是偏东气团和北西北气团。不同方向上气溶胶粒子的粒径分布有显著的差异，其中来自西北气团的气溶胶粒子，有最大的表面积浓度，尤其是0.5~1 μm粒径范围内的气溶胶粒子浓度最大；而北西北气团的气溶胶粒子主要集中在核模态和粗模态。不同气团中气溶胶粒子的化学组成也有显著的差异，其中K-nitrate、Ammonium、C3、Metal主要来自西北气团的贡献、其次为偏东气团贡献，K-Biomass、K-OC、EC、ECOC在3类气团中均有浓度贡献，其中K-OC、EC、ECOC、Dust在北西北气团所占比例最高。

Abstract：Physicochemical properties of aerosol particles were analyzed during a haze event in the Northern Suburb of Nanjing by using data of a Single Particle Aerosol Mass Spectrometry (SPAMS), wide range particle spectrometer (WPS), and meteorological parameters. The results showed that the change of visibility was mainly influenced by changes in wind direction. Minimum visibility was most commonly associated with northwesterly air mass, followed easterly and north-northwesterly air masses. Particle size distribution of different aerosol sources was also different. Particles from the northwesterly mass had the largest surface area concentration, especially for the particles in 0.5~1 μm. While the particles from north-northwesterly air mass were mainly concentrated in nuclear mode and coarse mode. Chemical compositions of particles from three directions were also significantly different. K-nitrate, Ammonium, C3, and Metal were mainly from northwesterly and easterly air masses. K-Biomass, K-OC, EC and ECOC were from air masses of all three directions, while K-OC, EC, ECOC, and Dust accounted for the highest proportion from the north-northwesterly air mass.