Light attenuation cross-section of black carbon in an urban atmosphere in northern China |
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| Institution: | 1. Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;2. Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China;3. The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong, China;4. Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;5. School of Environmental Science and Engineering, Hubei Polytechnic University, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Huangshi 435000, China;1. Department of Energy Technology, Lappeenranta University of Technology, FI-53851 Lappeenranta, Finland;2. VTT Technical Research Centre of Finland, FI-02044 VTT, Finland;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 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. Department of Power Engineering, Harbin Institute of Technology, Harbin, China;2. Department of Mechanical Engineering, Hanyang University, Seoul 133-791, South Korea;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. 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 |
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| Abstract: | Fine particulate matter (PM2.5) samples were collected over two years in Xi’an, China to investigate the relationships between the aerosol composition and the light absorption efficiency of black carbon (BC). Real-time light attenuation of BC at 880 nm was measured with an aethalometer. The mass concentrations and elemental carbon (EC) contents of PM2.5 were obtained, and light attenuation cross-sections (σATN) of PM2.5 BC were derived. The mass of EC contributed ～5% to PM2.5 on average. BC σATN exhibited pronounced seasonal variability with values averaging 18.6, 24.2, 16.4, and 26.0 m2/g for the spring, summer, autumn, and winter, respectively, while averaging 23.0 m2/g overall. σATN varied inversely with the ratios of EC/PM2.5, EC/SO42?], and EC/NO3?]. This study of the variability in σATN illustrates the complexity of the interactions among the aerosol constituents in northern China and documents certain effects of the high EC, dust, sulfate and nitrate loadings on light attenuation. |
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| Keywords: | Light attenuation cross-section Elemental carbon Dust Xi’an |
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