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| Main components and extinction characteristic of aerosol during March 2009 at Tianjin |
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Abstract Main components and contribution to atmospheric extinction coefficient were studied using particulate sample data in spring at Tianjin. The pollution of aerosol was heavy, the water-soluble inorganic ion and carbonaceous were main components, accounted for about 24.8% and 10.0% of the total PM10, 26.6% and 13.9% of the total PM2.5, respectively. SO42-, NO3- and Ca2+ were main inorganic ions. The meteorological conditions were good for the transformation of sulfate and nitrate during haze days. The SOC mass concentration were estimated with the Minimum ratio method of OC/EC, the ratio of SOC and OC in PM10 and PM2.5 was 38% and 24%. The second icons (SO42-, NO3- and NH4+), coarse mass, OC and EC were main factors influencing the atmospheric extinction coefficient. The average contributions were 33.1%, 22.6%, 22.0% and 15.6%. The atmospheric extinction and visibility could be fitted well with components and relative humidity.
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Received: 12 May 2011
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