Atmospheric Environment, 2014, Vol.84, p.54(11)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.atmosenv.2013.11.019 Byline: Jun Zhu, Huizheng Che, Xiangao Xia, Hongbin Chen, Phillipe Goloub, Wenxing Zhang Abstract: The AERONET level 2.0 data at Xinglong station from February 2006 to July 2011 were used to characterize the aerosol optical and physical properties, including temporal variability, aerosol absorption, classification and properties under dust and haze conditions. The annual mean aerosol optical depth (AOD) and extinction Angstrom exponent (EAE) are 0.28 [+ or -] 0.30 and 1.07 [+ or -] 0.38, respectively. The seasonal variations of AOD.sub.440nm are higher in spring (0.40 [+ or -] 0.3) and summer (0.40 [+ or -] 0.42) than in autumn (0.20 [+ or -] 0.22) and winter (0.19 [+ or -] 0.21). The EAE is low in spring (0.96 [+ or -] 0.43) and high in summer (1.22 [+ or -] 0.38). The EAE is [approximately equal to]1.25 with an absorption Angstrom exponent (AAE) of [approximately equal to]1.0-1.5 in Xinglong, which indicates that the dominant type is mixed aerosol (accounting for 88.2% at AAE 〉 1.0). Almost all of the dust observations occurred in spring. The volume concentrations of both fine and coarse mode particles increase with increasing AOD. In spring, the increase of coarse particles is greater than that of fine aerosols; however, the reverse phenomenon is observed for other seasons. The high AOD at Xinglong could be associated with the growth of fine mode aerosols and addition of coarse mode particles. This background station is not only impacted by dust aerosols from northwest China and south Mongolia but also influenced by long-range transportation of anthropogenic aerosols from south urban and industrialized regions. The mean AOD was 1.49 on the dust day, while AOD was 1.10 on the haze day. The mean EAEs were 0.09 and 1.43 on dust and haze days, respectively. Author Affiliation: (a) Laboratory for Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China (b) Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, CMA, Beijing 100081, China (c) Laboratoire d' Optique Atmospherique, Universitede Lille 1, Villeneuve d'Ascq, France (d) University of Chinese Academy of Sciences, Beijing 100049, China Article History: Received 22 April 2013; Revised 8 November 2013; Accepted 11 November 2013
Middle Atmosphere ; Atmospheric Physics ; Atmospheric Composition ; Atmospheric Chemistry
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