Chemical characteristics of haze during summer and winter in Guangzhou

Airborne particles were collected with a 10-stage MOUDI and a PM 10 sampler in Guangzhou, China, during both haze and normal days in the summer of 2002 and 2003, and winter 2002. The characteristics of PAHs, organic carbon, elemental carbon and water-soluble inorganic ions were studied under four pe...

Full description

Saved in:
Bibliographic Details
Published in:Atmospheric research 2009-10, Vol.94 (2), p.238-245
Main Authors: Tan, Ji-Hua, Duan, Jing-Chun, Chen, Duo-Hong, Wang, Xin-Hua, Guo, Song-Jun, Bi, Xin-Hui, Sheng, Guo-Ying, He, Ke-Bin, Fu, Jia-Mo
Format: Article
Language:English
Subjects:
Atmospherics
Carbon
Carbonaceous
Correlation analysis
Earth, ocean, space
Exact sciences and technology
External geophysics
Guangzhou
Haze
Hydrocarbons
Meteorology
Relative humidity
Summer
Visibility
Water-soluble ions
Winter
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Airborne particles were collected with a 10-stage MOUDI and a PM 10 sampler in Guangzhou, China, during both haze and normal days in the summer of 2002 and 2003, and winter 2002. The characteristics of PAHs, organic carbon, elemental carbon and water-soluble inorganic ions were studied under four periods (summer normal, summer haze, winter normal and winter haze). In this study, secondary pollutants (OC, SO 4 2−, NO 3 − and NH 4 +) were the major chemical components and appeared to show a remarkably rapid increase from normal to haze days. The particle mass size distributions were bimodal and dominated by fine particles in haze days. A significantly higher OC/EC ratio was found in haze days (3.2–4.7) compared to normal days (1.8–2.8), indicating secondary organic aerosol formation might be significant during haze days. Correlation analysis between visibility and chemical species showed that the major scattering species were TC (total carbon) and sulfate in normal days and nitrate and TC in haze days, respectively. Simultaneously, correlation analysis between visibility and meteorological factors demonstrated that visibility increased with both temperature and wind speed, while it decreased with relative humidity. Furthermore, the relatively higher value of IcdP/(BghiP + IcdP) and the low value of Cmax, CPI, and BghiP/BeP in winter haze could be due to the growth of motor vehicle usage and energy consumption in winter.
ISSN:0169-8095
1873-2895
DOI:10.1016/j.atmosres.2009.05.016