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Title: Typical atmospheric haze during crop harvest season in northeastern China: A case in the Changchun region
Author: W. W. Chen, D. Q. Tong, M. Dan, S. C. Zhang, X. L. Zhang and Y. P. Pan
Corresponding Author: 陈卫卫
Source: Journal of Environmental Sciences
Issued Date: 2017
DOI: 10.1016/j.jes.2016.03.031
Volume: 54, Pages:101-113
Abstract: This study presents the mass concentrations of PM2.5; O-3; SO2 and NOx at one urban, one suburban and two rural locations in the Changchun region from September 25 to October 27 2013. Major chemical components of PM2.5 at the four sites were daily sampled and analyzed. Most of daily concentrations of SO2 (7-82 mu g/m(3)), O-3 (27-171 mu g/m(3)) and NOx (14-213 mu g/m(3)) were below the limits of the National Ambient Air Quality Standard (NAAQS) in China. However, PM2.5 concentrations (143-168 mu g/m3) were 2-fold higher than NAAQS Higher PM2.5 concentrations (similar to 150 mu g/m(3)) were measured during the pre-harvest and harvest at the urban site, while PM2.5 concentrations significantly increased from 250 to 400 mu g m(-3) at suburban and rural sites with widespread biomass burning. At all sites, PM2.5 components were dominated by organic carbon (OC) and followed by soluble component sulfate (SO42-), ammonium (NH4+) and nitrate (NO3-). Compared with rural sites, urban site had a higher mineral contribution and lower potassium (K+ and K) contribution to PM2.5. Severe atmospheric haze events that occurred from October 21 to 23 were attributed to strong source emissions (e.g., biomass burning) and unfavorable air diffusion conditions. Furthermore, coal burning originating from winter heating supply beginning on October 18 increased the atmospheric pollutant emissions. For entire crop harvest period, the Positive Matrix Factorization (PMF) analysis indicated five important emission contributors in the Changchun region, as follows: secondary aerosol (39%), biomass burning (20%), supply heating (18%), soil/road dust (14%) and traffic (9%). (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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Content Type: 期刊论文
URI: http://ir.iga.ac.cn/handle/131322/7567
Appears in Collections:湿地与全球变化学科组_期刊论文

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