Secondary organic aerosol formation from semi- and intermediate-volatility organic compounds and glyoxal
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.
2013
2021-04-10 21:36:04
1033
secondary organic aerosol, glyoxal, aqueous multiphase chemistry, oxygen-to-carbon ratio, single scattering albedo
Eleanor M.
Waxman
70
Katja
Džepina
70
Barbara
Ervens
70
Julia
Lee-Taylor
70
Bernard
Aumont
70
Jose L.
Jimenez
70
Sasha
Madronich
70
Rainer
Volkamer
70
COBISS_ID
3
59044867
UDK
4
54
ISSN pri članku
9
0094-8276
DOI
15
10.1002/grl.50203
NUK URN
18
URN:SI:UNG:REP:MLS5EVLQ
Waxman_GRL_2013.pdf
741785
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