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Title:Secondary organic aerosol formation from semi- and intermediate-volatility organic compounds and glyoxal : relevance of O/C as a tracer for aqueous multiphase chemistry
Authors:ID Waxman, Eleanor M. (Author)
ID Džepina, Katja (Author)
ID Ervens, Barbara (Author)
ID Lee-Taylor, Julia (Author)
ID Aumont, Bernard (Author)
ID Jimenez, Jose L. (Author)
ID Madronich, Sasha (Author)
ID Volkamer, Rainer (Author)
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Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The role of aqueous multiphase chemistry in the formation of secondary organic aerosol (SOA) remains difficult to quantify. We investigate it here by testing the rapid formation of moderate oxygen-to-carbon (O/C) SOA during a case study in Mexico City. A novel laboratory-based glyoxal-SOA mechanism is applied to the field data, and explains why less gas-phase glyoxal mass is observed than predicted. Furthermore, we compare an explicit gas-phase chemical mechanism for SOA formation from semi- and intermediate-volatility organic compounds (S/IVOCs) with empirical parameterizations of S/IVOC aging. The mechanism representing our current understanding of chemical kinetics of S/IVOC oxidation combined with traditional SOA sources and mixing of background SOA underestimates the observed O/C by a factor of two at noon. Inclusion of glyoxal-SOA with O/C of 1.5 brings O/C predictions within measurement uncertainty, suggesting that field observations can be reconciled on reasonable time scales using laboratory-based empirical relationships for aqueous chemistry.
Keywords:secondary organic aerosol, glyoxal, aqueous multiphase chemistry, oxygen-to-carbon ratio, single scattering albedo
Year of publishing:2013
Number of pages:str. 978-982
Numbering:Vol. 40, iss. 5
PID:20.500.12556/RUNG-6453 New window
COBISS.SI-ID:59044867 New window
ISSN on article:0094-8276
DOI:10.1002/grl.50203 New window
Publication date in RUNG:11.04.2021
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Record is a part of a journal

Title:Geophysical research letters
Shortened title:Geophys. res. lett.
Publisher:American Geophysical Union.
COBISS.SI-ID:16168965 New window