Secondary organic aerosol formation from cyclohexene ozonolysis in the presence of water vapor and dissolved salts |
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| Authors: | Bethany Warren Quentin GJ Malloy Lindsay D Yee David R Cocker |
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| Institution: | 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Atmospheric Chemistry and Environmental Sciences, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China;3. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;4. Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA;1. Department of Biochemistry and Molecular Biology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States;2. Department of Environmental and Occupational Health, College of Public Health, University of Arkansas for Medical Sciences, 4301 W. Markham, Slot 820. Little Rock, AR 72205, Unites States;3. The Winthrop P. Rockefeller Cancer Institute, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States |
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| Abstract: | A series of 90 experiments were conducted in the UC Riverside/CE-CERT environmental chamber to evaluate the impact of water vapor and dissolved salts on secondary organic aerosol formation for cyclohexene ozonolysis. Water vapor (low – 30 ± 2% RH, medium – 46 ± 2% RH, high – 63 ± 2% RH) was found to directly participate in the atmospheric chemistry altering the composition of the condensing species, thus increasing total organic aerosol formation by ～22% as compared to the system under dry (<0.1% RH) conditions. Hygroscopicity measurements also indicate that the organic aerosol composition is altered in the presence of gaseous water. These results are consistent with water vapor reacting with the crigee intermediate in the gas phase resulting in increased aldehyde formation. The addition of dissolved salts ((NH4)2SO4, NH4HSO4, CaCl2, NaCl) had minimal effect; only the (NH4)2SO4 and NaCl were found to significantly impact the system with ～10% increase in total organic aerosol formation. These results indicate that the organics may be partitioning to an outer organic shell as opposed to into the aqueous salt. Hygroscopicity measurements indicate that the addition of salts does not alter the aerosol composition for the dry or water vapor system. |
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