Extinction characteristics of aerosol and the contribution of pollution source to light extinction in Langfang
LI Qian1, WU Lin1, ZHANG Jin-sheng1, WANG Ya-nan1, LI Huai-rui2, MAO Hong-jun1
1. Center for Urban Transport Emission Research, The College of Environmental Science & Engineering, Nankai University, Tianjin 300071, China;
2. Langfang Academy of Eco Industrialization for Wisdom Environment, Langfang 065000, China
The study by using the observation data (from May to September 2016) of Langfang Atmospheric Monitoring Super Station, the pollution characteristics of PM2.5, extinction characteristics, source analysis and backward trajectory analysis were carried out. During the observation period, the concentrations of PM2.5 were (43.82±28.68)µg/m3. SO42-, NO3-, NH4+, OC and EC accounting for 24.74%, 22.98%, 20.54%, 8.79% and 5.50% of the mass of PM2.5, respectively. The concentration of components increased with increment of PM2.5 concentration. Scattering coefficient (Bsp) and absorption coefficient (Bap) of atmospheric extinction were (294.54±257.35), (16.05±9.14)Mm-1, respectively, The contribution of the coarse particles to the extinction coefficient (11.12%) was the lowest. PM2.5 played a major role in atmospheric extinction. Among them, Nitrate (32.23%), Sulfate (27.28%) and OM (20.56%) were the most important extinction components. PM2.5 mainly from industry (14.14%), motor vehicles (15.15%), secondary sources (38.38%), coal combustion (22.22%) and dust and biomass burning(10.10%). The contribution of various pollution sources to the extinction coefficient was 1.32% (industry), 17.25% (motor vehicle), 55.57% (secondary source), 18.56% (coal combustion) and 7.32% (dust and biomass burning). According to the backward analysis, the small-scale, short-distance transmissions from Shandong and Henan provinces as well as the medium and short-distance transmissions from northeastern and central Inner Mongolia were the major sources of the air mass of Langfang City, which were accounted for nearly 80%. The potential distribution areas of pollution sources were mainly in northeastern Shandong, eastern Henan, eastern Shanxi, and southwest Liaoning.
李倩, 吴琳, 张进生, 汪亚男, 李怀瑞, 毛洪钧. 廊坊市夏季大气气溶胶消光特性及其来源[J]. 中国环境科学, 2019, 39(6): 2249-2257.
LI Qian, WU Lin, ZHANG Jin-sheng, WANG Ya-nan, LI Huai-rui, MAO Hong-jun. Extinction characteristics of aerosol and the contribution of pollution source to light extinction in Langfang. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2249-2257.
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