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@ARTICLE{Kim:903135,
author = {Kim, Dongwook and Cho, Changmin and Jeong, Seokhan and Lee,
Soojin and Nault, Benjamin A. and Campuzano-Jost, Pedro and
Day, Douglas A. and Schroder, Jason C. and Jimenez, Jose L.
and Volkamer, Rainer and Blake, Donald R. and Wisthaler,
Armin and Fried, Alan and DiGangi, Joshua P. and Diskin,
Glenn S. and Pusede, Sally E. and Hall, Samuel R. and
Ullmann, Kirk and Huey, L. Gregory and Tanner, David J. and
Dibb, Jack and Knote, Christoph J. and Min, Kyung-Eun},
title = {{F}ield observational constraints on the controllers in
glyoxal ({CHOCHO}) loss to aerosol},
journal = {Atmospheric chemistry and physics / Discussions},
issn = {1680-7367},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2021-04859},
year = {2021},
abstract = {Abstract. Glyoxal (CHOCHO), the simplest dicarbonyl in the
troposphere, is an important precursor for secondary organic
aerosol (SOA) and brown carbon (BrC) affecting air-quality
and climate. The airborne measurement of CHOCHO
concentrations during the KORUS-AQ (KORea-US Air Quality
study) campaign in 2016 enables detailed quantification of
loss mechanisms, pertaining to SOA formation in the real
atmosphere. The production of this molecule was mainly from
oxidation of aromatics (59 $\%)$ initiated by hydroxyl
radical (OH), of which glyoxal forming mechanisms are
relatively well constrained. CHOCHO loss to aerosol was
found to be the most important removal path (69 $\%)$ and
contributed to roughly ~20 $\%$ (3.7 μg sm−3 ppmv−1
hr−1, normalized with excess CO) of SOA growth in the
first 6 hours in Seoul Metropolitan Area. To our knowledge,
we show the first field observation of aerosol surface-area
(Asurf)-dependent CHOCHO uptake, which diverges from the
simple surface uptake assumption as Asurf increases in
ambient condition. Specifically, under the low (high)
aerosol loading, the CHOCHO effective uptake rate
coefficient, keff,uptake, linearly increases (levels off)
with Asurf, thus, the irreversible surface uptake is a
reasonable (unreasonable) approximation for simulating
CHOCHO loss to aerosol. Dependency of photochemical impact,
as well as aerosol viscosity, are discussed as other
possible factors influencing CHOCHO uptake rate. Our
inferred Henry's law coefficient of CHOCHO, 7.0 × 108 M
atm−1, is ~2 orders of magnitude higher than those
estimated from salting-in effects constrained by inorganic
salts only, which urges more understanding on CHOCHO
solubility under real atmospheric conditions.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {2111 - Air Quality (POF4-211)},
pid = {G:(DE-HGF)POF4-2111},
typ = {PUB:(DE-HGF)25},
doi = {10.5194/acp-2021-672},
url = {https://juser.fz-juelich.de/record/903135},
}