Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26717
Title: Optical properties of size-resolved particles at a Hong Kong urban site during winter
Authors: Gao, Y
Lai, S
Lee, SC 
Yau, PS
Huang, Y
Cheng, Y
Wang, T 
Xu, Z
Yuan, C
Zhang, Y
Keywords: Aerosol light extinction
Chemical species
Size-resolved PM
Source apportionment
Issue Date: 2015
Publisher: Elsevier
Source: Atmospheric research, 2015, v. 155, p. 1-12 How to cite?
Journal: Atmospheric research 
Abstract: Visibility degradation in Hong Kong is related to the city's serious air pollution problems. To investigate the aerosols' optical properties and their relationship with the chemical composition and size distribution of the particles, a monitoring campaign was conducted at an urban site in the early winter period (from October to December, 2010). The particle light scattering coefficient (Bsp) and absorption coefficient (Bap) were measured. Two collocated Micro-Orifice Uniform Deposit Impactor samplers (MOUDI110, MSP, USA) with nominal 50% cut-off aerodynamic diameters of 18, 10, 5.6, 3.2, 1.8, 1, 0.56, 0.32, 0.18, 0.1, and 0.056£gm were used to collect size-resolved particle samples. The average Bsp and Bap were 201.96¡Ó105.82Mm-1 and 39.91¡Ó19.16Mm-1, with an average single scattering albedo (£so) of 0.82¡Ó0.07. The theoretical method of light extinction calculation was used to determine the extinction of the size-resolved particulate matters (PM). The reconstructed light scattering coefficient correlated well with the measured scattering value in the Hong Kong urban area. Droplet mode (0.56-1.8£gm) particles contributed most to the particle light extinction (~69%). Organic matter, ammonium sulphate and elemental carbon were the key components causing visibility degradation in the droplet (0.56-1.8£gm) and condensation (0.1-0.56£gm) size ranges. Five s
URI: http://hdl.handle.net/10397/26717
ISSN: 0169-8095
EISSN: 1873-2895
DOI: 10.1016/j.atmosres.2014.10.020
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