Secondary organic aerosol production from aqueous photooxidation of glycolaldehyde: Laboratory experiments |
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| Authors: | Mark J Perri Sybil Seitzinger Barbara J Turpin |
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| Institution: | 1. Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, NJ 08901, USA;2. Institute of Marine and Coastal Sciences, Rutgers University, Rutgers/NOAA CMER Program, 71 Dudley Road, New Brunswick, NJ 08901, USA;1. Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA;2. SRA International, Washington, DC 20005, USA;3. NASA Langley Research Center, Hampton, VA 23681, USA;4. Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA;5. Department of Civil and Environmental Engineering, Portland State University, OR 97021, USA;1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China;2. Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China;3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;4. Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan;5. Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA;6. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China |
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| Abstract: | Organic particulate matter (PM) formed in the atmosphere (secondary organic aerosol; SOA) is a substantial yet poorly understood contributor to atmospheric PM. Aqueous photooxidation in clouds, fogs and aerosols is a newly recognized SOA formation pathway. This study investigates the potential for aqueous glycolaldehyde oxidation to produce low volatility products that contribute SOA mass. To our knowledge, this is the first confirmation that aqueous oxidation of glycolaldehyde via the hydroxyl radical forms glyoxal and glycolic acid, as previously assumed. Subsequent reactions form formic acid, glyoxylic acid, and oxalic acid as expected. Unexpected products include malonic acid, succinic acid, and higher molecular weight compounds, including oligomers. Due to (1) the large source strength of glycolaldehyde from precursors such as isoprene and ethene, (2) its water solubility, and (3) the aqueous formation of low volatility products (organic acids and oligomers), we predict that aqueous photooxidation of glycolaldehyde and other aldehydes in cloud, fog, and aerosol water is an important source of SOA and that incorporation of this SOA formation pathway in chemical transport models will help explain the current under-prediction of organic PM concentrations. |
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