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@ARTICLE{Li:141340,
      author       = {Li, Xin and Rohrer, F. and Brauers, T. and Hofzumahaus, A.
                      and Lu, K. and Shao, M. and Zhang, Y. H. and Wahner, A.},
      title        = {{M}odeling of {HCHO} and {CHOCHO} at a semi-rural site in
                      southern {C}hina during the {PRIDE}-{PRD}2006 campaign},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {13},
      number       = {12},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2013-06524},
      pages        = {33013 - 33054},
      year         = {2013},
      abstract     = {HCHO and CHOCHO are important trace gases in the
                      atmosphere, serving as tracers of VOCs oxidations. In the
                      past decade, high concentrations of HCHO and CHOCHO have
                      been observed for the Pearl River Delta (PRD) region in
                      southern China. In this study, we performed box model
                      simulations of HCHO and CHOCHO at a semi-rural site in PRD,
                      focusing on understanding their sources and sinks and
                      factors influencing the CHOCHO to HCHO ratio (RGF). The
                      model was constrained by the simultaneous measurements of
                      trace gases and radicals. Isoprene oxidation by OH radicals
                      is the major pathway forming HCHO, followed by degradations
                      of alkenes, aromatics, and alkanes. The production of CHOCHO
                      is dominated by isoprene and aromatic degradation;
                      contributions from other NMHCs are of minor importance. The
                      modeled RGF shows a complex dependence on the VOCs
                      composition, OH and NOx levels, and atmospheric physical
                      processes, which suggest the necessity of careful treatment
                      of RGF as an indicator of anthropogenic or biogenic
                      emissions. Compared to the measurement results, the model
                      predicts significant higher HCHO and CHOCHO concentrations.
                      Sensitivity studies suggest that this discrepancy is to a
                      large extent $(>70\%)$ due to the missing consideration of
                      fresh emissions, vertical transport of precursor VOCs, and
                      uptake of HCHO and CHOCHO by aerosols in the model.
                      Insufficient treatments of dry deposition of HCHO and CHOCHO
                      and of vertical dilution of all species in the model account
                      for the rest $30\%$ discrepancy. Our study indicates that,
                      in addition to chemical mechanisms, atmospheric physical
                      processes (e.g., transport, dilution, deposition) have to be
                      well considered for a box model predicting HCHO and CHOCHO
                      concentrations.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233)},
      pid          = {G:(DE-HGF)POF2-233},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-13-33013-2013},
      url          = {https://juser.fz-juelich.de/record/141340},
}