Observation and analysis of near-surface atmospheric aerosol optical properties in urban Beijing |
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| Institution: | 1. Centre for Atmosphere Watch and Services, Meteorological Observation Centre of China Meteorological Administration, Beijing, China;2. Key Laboratory of Regional Climate-Environment for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;3. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, China;4. Key Laboratory of Atmospheric Chemistry, Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, Beijing, China;5. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;6. Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto, Canada;1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Department of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;3. Jiangsu Institute of Meteorological Sciences, Nanjing 210008, China;1. Department of Chemical and Process Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand;2. Centre for Energy Technology, School of Chemical Engineering, University of Adelaide, Adelarde, Australia;1. Engine Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;1. Department of Power Engineering, Harbin Institute of Technology, Harbin, China;2. Department of Mechanical Engineering, Hanyang University, Seoul 133-791, South Korea;1. Department of Integrated Environmental Systems, Pyeongtaek University, 3825 Seodongdae-ro, Pyeongtaek-Shi, Gyeonggi-do 450-701, Republic of Korea;2. GreenSolus Co., #804, Byoksan Digital Valley 3-Cha, 271 Digital-ro, Guro-gu, Seoul 152-775, Republic of Korea;3. Global Frontier Center for Multiscale Energy Systems, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China;2. Chinese Academy of Meteorological Sciences, Beijing 100081, China;3. Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, China;4. Canadian Center for Climate Modeling and Analysis, University of Victoria, Victoria, BC, Canada V8W 3V6 |
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| Abstract: | Year-round measurements of the mass concentration and optical properties of fine aerosols (PM2.5) from June 2009 to May 2010 at an urban site in Beijing were analyzed. The annual mean values of the PM2.5 mass concentration, absorption coefficient (Ab), scattering coefficient (Sc) and single scattering albedo (SSA) at 525 nm were 67 ± 66 μg/m3, 64 ± 62 Mm−1, 360 ± 405 Mm−1 and 0.82 ± 0.09, respectively. The bulk mass absorption efficiency and scattering efficiency of the PM2.5 at 525 nm were 0.78 m2/g and 5.55 m2/g, respectively. The Ab and Sc showed a similar diurnal variation with a maximum at night and a minimum in the afternoon, whereas SSA displayed an opposite diurnal pattern. Significant increases in the Ab and Sc were observed in pollution episodes caused by the accumulation of pollutants from both local and regional sources under unfavorable weather conditions. Aerosol loadings in dust events increased by several times in the spring, which had limited effects on the Ab and Sc due to the low absorption and scattering efficiency of dust particles. The frequency of haze days was the highest in autumn because of the high aerosol absorption and scattering under unfavorable weather conditions. The daily PM2.5 concentration should be controlled to a level lower than 64 μg/m3 to prevent the occurrence of haze days according to its exponentially decreased relationship with visibility. |
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| Keywords: | Aerosol optical properties Haze Visibility |
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