Mixing state of individual carbonaceous particles during a severe haze episode in January 2013, Nanjing,China |
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| Affiliation: | 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan;4. Department of Physics, University of Helsinki, Helsinki, Finland;5. National Oceanic and Atmospheric Administration, Boulder, CO, USA;6. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA;7. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, China;1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Collaorative Innovation Center Atmospheric Environment and Equipment Technology, Nanjing 210044, China;3. Nanjing Institute of Soil, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | Chemical composition, hourly counts, and sizes of atmospheric carbonaceous particles were measured to investigate their mixing state on clear and hazy days. 623,122 carbonaceous particles with sizes 0.2–2.0 μm was analyzed using a single-particle aerosol mass spectrometer from 1st to 17th January 2013. Particle types included biomass/biofuel burning particles (biomass), element carbon (EC-dominant) particles that were also mixed with biomass/biofuel burning species (EC-biomass) or secondary species (EC-secondary), organic carbon (OC), internally mixed OC and EC (OCEC), ammonium-containing (ammonium) and sodium-containing (sodium) particles. On clear days the top ranked carbonaceous particle types were biomass (48.2%), EC-biomass (15.7%), OCEC (11.1%), and sodium (9.6%), while on hazy days they were biomass (37.3%), EC-biomass (17.6%), EC-secondary (16.6%), and sodium (12.7%). The fractions of EC-secondary, ammonium (10%), and sodium particle types were elevated on hazy days. Numbers of EC-secondary particles were more than four times those on clear days (4.1%). Thus, carbonaceous particles mixed with ammonium, nitrate and sulfate during aging and transport, enhancing their light extinction effects and hygroscopic growth under high relative humidity on hazy days, further reducing visibility. Our real-time single-particle data showed that changes to mixing state had a significant impact on light extinction during haze events in Nanjing. |
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| Keywords: | Haze Single particle Mixing state SPAMS Carbonaceous particle Secondary aerosols |
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