20.500.12556/RUNG-6453
Secondary organic aerosol formation from semi- and intermediate-volatility organic compounds and glyoxal
relevance of O/C as a tracer for aqueous multiphase chemistry
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.
secondary organic aerosol
glyoxal
aqueous multiphase chemistry
oxygen-to-carbon ratio
single scattering albedo
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Angleški jezik
Ni določen
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2021-04-10 21:36:04
2021-04-11 10:07:52
2023-06-09 03:43:16
0000-00-00 00:00:00
2013
0
0
str. 978-982
iss. 5
Vol. 40
2013
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
59044867
54
0094-8276
10.1002/grl.50203
URN:SI:UNG:REP:MLS5EVLQ
Univerza v Novi Gorici
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