Journal articles
Secondary organic aerosol formation from semi- and intermediate-volatility organic compounds and glyoxal: Relevance of O/C as a tracer for aqueous multiphase chemistry
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.
https://hal-insu.archives-ouvertes.fr/insu-03621044
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Monday, March 28, 2022 - 1:40:04 PM
Last modification on : Thursday, April 7, 2022 - 1:58:22 PM
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Monday, March 28, 2022 - 1:40:04 PM
Last modification on : Thursday, April 7, 2022 - 1:58:22 PM
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Geophysical Research Letters -...
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