Comparison of aerosol characteristics during haze periods over two urban agglomerations in China using CALIPSO observations |
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| Institution: | 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;3. College of Physics and Electrical Information Engineering, Ningxia University, Yinchuan 750021, China;4. Institute of Desert Meteorology, China Meteorology Administration, Urumqi 830002, China;5. National Climate Center, China Meteorology Administration, Beijing 100081, China;1. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;2. Department of Biomedical Engineering, Seonam University, Namwon 55724, Republic of Korea;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Science, Beijing 100049, China;1. The Nanotechnology Program at The American University in Cairo (AUC), Egypt;2. The Center for Nanoelectronics and Devices (CND), The American University in Cairo/Zewail City of Science and Technology, Cairo, Egypt;1. Department of Physics, School of Science and Engineering, The American University in Cairo, Egypt;1. Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia;2. Department of Theoretical Physics and Astrophysics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovakia;1. School of Life Sciences, Shandong University, Jinan 250100, China;2. Institute of Environmental Research, Shandong University, Jinan 250100, China |
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| Abstract: | Using CALIPSO (cloud-aerosol lidar and infrared pathfinder satellite observation) vertical observation data during haze periods from January 2007 to December 2008, we analyzed differences in aerosol characteristics near the surface, as well as in the middle troposphere between the Beijing–Tianjin–Hebei metropolitan region (Area A) and the Yangtze River Delta region (Area B) in China. One significant difference was that haze pollution in Area A was related to local and non-local aerosols, while in Area B it was related to local anthropogenic sources. In all seasons apart from autumn, aerosol pollution in Area A was more severe than in Area B, both near the surface and at higher altitudes. In Area A, non-spherical aerosols were dominant from 0 to 4 km in spring, summer, and winter; while in autumn, there were considerably high numbers of non-spherical aerosols below 0.5 km, and near-spherical aerosols from 0.5 to 4 km. In Area B, both near-spherical and non-spherical aerosols were common in all seasons. Moreover, aerosols with attenuated color ratios of 0–0.2 were more common in all seasons in Area A than in Area B, indicating that fine particle pollution in Area A was more serious than in Area B. Finally, relatively large aerosols linked to gravity settling appeared more frequently near the surface in Area A than in Area B. |
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| Keywords: | CALIPSO Aerosols Haze Vertical distribution Seasonal variation Urban agglomerations |
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