Particles size distributions and aerosol optical properties during haze-fog episodes in the winter of Xuzhou
LANG Hong-mei1,2, QIN Kai1,2, YUAN Li-mei2, XIAO Xin2, HU Ming-yu1,2, RAO Lan-lan1,2, WANG Lu-yao1,2
1. National Administration of Surveying, Mapping and Geoinformation Key Laboratory of Land Environment and Disaster Monitoring, China University of Mining and Technology, Xuzhou 221116, China;
2. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
In order to investigate the characteristics of particles size distributions and aerosol optical properties during haze-fog episodes in the winter, the data of atmospheric particulates mass concentrations (PM10, PM1, and PM2.5), number concentrations (0~1μm, 1~2.5μm, and 2.5~10μm) and aerosol optical properties over Xuzhou from December 1, 2014 to February 28, 2015 were studied. Low wind speed and high relative humidity were important meteorological factors for affecting the formation and the maintenance of the haze-fog weather, and the increasing of 0~1μm fine particles was the main factor causing the haze-fog weather during the winter in Xuzhou. Under the condition of long-lasting haze and fog days, 1~10μm particlesreduced in the haze and fog periods due to the moisture absorption and vapor attachment of particulates. With the decreasing of relative humidity, haze and fog weather turn into a short time of haze weather, then the number concentration of 1~10μm particles increased significantly. AODtotal and AODfine mode at 500nm of Xuzhou changed in the same trend in the winter. Besides, under the condition of haze-fog days, AODtotal and AODfine mode were significantly higher than that in non haze days. Under the condition of haze-fog days, the ratio of AODfine mode to AODcoarse mode was also significantly higher than that in non haze days, and the Angstrom exponent lied mainly in the range of 1~1.6, indicating the predominance of fine-mode particles during haze-fog episodes in the winter of Xuzhou.
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