title: An intensive study on aerosol optical properties and affecting factors in Nanjing, China.
abstract: The optical properties of aerosol as well as their impacting factors were investigated at a suburb site in Nanjing during autumn from 14 to 28 November 2012. More severe pollution was found together with lower visibility. The average scattering and absorption coefficients (Bsca and Babs) were 375.7 ± 209.5 and 41.6 ± 18.7 Mm(-1), respectively. Higher Ångström absorption and scattering exponents were attributed to the presence of more aged aerosol with smaller particles. Relative humidity (RH) was a key factor affecting aerosol extinction. High RH resulted in the impairment of visibility, with hygroscopic growth being independent of the dry extinction coefficient. The hygroscopic growth factor was 1.8 ± 1.2 with RH from 19% to 85%. Light absorption was enhanced by organic carbon (OC), elemental carbon (EC) and EC coatings, with contributions of 26%, 44% and 75% (532 nm), respectively. The Bsca and Babs increased with increasing N100 (number concentration of PM2.5 with diameter above 100 nm), PM1 surface concentration and PM2.5 mass concentration with good correlation.
authors.affiliation: Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China; School of Physics & Opto-electronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. Electronic address: cuifenping@nuist.edu.cn.
authors.forename: Fenping
authors.initials: F
authors.lastname: Cui
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China. Electronic address: chenmd@nuist.edu.cn.
authors.forename: Mindong
authors.initials: M
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Ma
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zheng
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China.
authors.forename: Yaoyao
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China.
authors.forename: Shizheng
authors.initials: S
authors.lastname: Li
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Qi
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry*; D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D002244:Carbon / Q000032:analysis; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D006813:Humidity; D055620:Optical Phenomena; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis; D017155:Wettability
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter; D002244:Carbon
keywords: Aerosol optical properties; Hygroscopic growth factor; Single scattering albedo; Ångström exponent