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《China Environmental Science》 2015-05
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Characteristics of particle mass concentrations and aerosol optical properties during a fog-haze event in Shenyang

ZHAO Hu-jia;MA Yan-jun;WANG Yang-feng;ZHU Yi-ming;Institute of Atmospheric Environment,China Meteorological Administration;Weather Modification Office in Liaoning Province;  
Data of visibility, particulate mass concentration(PM10、PM2.5、PM1.0) and the aerosol optical properties retrieved by CE318sun-photometer were analyzed together with surface meteorological elements(relative humidity, wind speed, temperature) during a fog-haze event in Shenyang, China, from October 2011 17 to 22. The results indicated that the higher relative temperature and the lower wind speed as well as the accumulation of mass concentrations are the main factors resulting the poor visibility and the fog-haze weather. The mass concentration of ρ(PM10)、ρ(PM2.5)、ρ(PM1.0) are about 138.8μg/m3, 103.3μg/m3, 94.9μg/m3, respectively, which were 2 times higher than those on non fog-haze days. The average ratio of PM2.5/PM10 and PM1.0/PM10 were about 74.7% and 68.6%, respectively. There is a strong correlation(R20.90) between visibility and PM mass concentration when the relative humidity was lower than 80%. However, the correlation was decreased when the relative humidity was higher than 80%. The AOD500 nm and Angstrom exponent on fog-haze days were higher than those on non fog-haze conditions. The values of AOD at 500 nm and Angstrom exponent on non fog-haze days are about 0.82 and 0.94 while during the haze-fog episodes, these two parameters increased to 1.42 and 1.25, respectively. The aerosol size distribution comes from the addition of fine aerosol particles on haze day were 2 times higher than those on non-haze days which indicating the predominance of fine particles on fog-haze days to further affect the aerosol optical characteristics.
【Fund】: 沈阳大气环境研究所资助项目(2014IAE-CMA05);; 国家科技支撑计划课题(2014BAC16B04)
【CateGory Index】: X513
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