| 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 |
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| 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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| Files: |
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | secondary organic aerosol, glyoxal, aqueous multiphase chemistry, oxygen-to-carbon ratio, single scattering albedo |
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| Year of publishing: | 2013 |
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| Number of pages: | str. 978-982 |
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| Numbering: | Vol. 40, iss. 5 |
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| PID: | 20.500.12556/RUNG-6453 |
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| COBISS.SI-ID: | 59044867 |
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| UDC: | 54 |
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| ISSN on article: | 0094-8276 |
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| DOI: | 10.1002/grl.50203 |
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| NUK URN: | URN:SI:UNG:REP:MLS5EVLQ |
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| Publication date in RUNG: | 11.04.2021 |
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| Views: | 2999 |
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| Downloads: | 0 |
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