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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},
}