State of mixture of atmospheric submicrometer black carbon particles and its effect on particulate light absorption |
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| Authors: | Hiroaki Naoe Shuichi Hasegawa Jost Heintzenberg Kikuo Okada Akihiro Uchiyama Yuji Zaizen Eriko Kobayashi Akihiro Yamazaki |
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| Institution: | 1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control, Nanjing 210044, China;3. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China;4. School of Physics & Opto-electronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;1. Earth System Modeling Center, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science & Technology, Nanjing, 210044, China;2. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing, 210044, China;3. International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, 96822, USA |
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| Abstract: | The state of mixture of light-absorbing carbonaceous particles was investigated in relation to light absorption properties using electron microscopic examinations, black carbon (BC) analyses of quartz filter by thermal/optical reflectance (TOR) method, measurements with two continuous light-absorbing photometers at a suburban site of Tsukuba, about 60 km northeast of Tokyo. The volume fraction of water-soluble material (?) in individual particles is important for assessing particulate light-absorbing and/or scattering of atmospheric aerosols. The values of ? in BC particles were evaluated by electron micrographs before and after dialysis (extraction) of water-soluble material. The mass absorption coefficient (MAC in units of m2 g?1) tended to increase with increasing the average ? in BC particles with the radius range of 0.05–0.5 μm. Thus, our results indicate that coatings of water-soluble material around BC particles can enhance the absorption of solar radiation. Moreover, the single scattering albedo (SSA) will increase because a large amount of coating material will scatter more light. |
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