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@ARTICLE{Li:202040,
      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},
      volume       = {14},
      number       = {22},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-04329},
      pages        = {12291 - 12305},
      year         = {2014},
      abstract     = {HCHO and CHOCHO are important trace gases in the
                      atmosphere, serving as tracers of VOC 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 the
                      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.
                      Compared to the measurement results, the model predicts
                      significant higher HCHO and CHOCHO concentrations.
                      Sensitivity studies suggest that fresh emissions of
                      precursor VOCs, uptake of HCHO and CHOCHO by aerosols, fast
                      vertical transport, and uncertainties in the treatment of
                      dry deposition all have the potential to contribute
                      significantly to this discrepancy. Our study indicates that,
                      in addition to chemical considerations (i.e., VOC
                      composition, OH and NOx levels), atmospheric physical
                      processes (e.g., transport, dilution, deposition) make it
                      difficult to use the CHOCHO to HCHO ratio as an indicator
                      for the origin of air mass composition.},
      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},
      UT           = {WOS:000345290700019},
      doi          = {10.5194/acp-14-12291-2014},
      url          = {https://juser.fz-juelich.de/record/202040},
}