% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Rolletter:865539,
      author       = {Rolletter, Michael and Kaminski, Martin and Acir,
                      Ismail-Hakki and Bohn, Birger and Dorn, Hans-Peter and Li,
                      Xin and Lutz, Anna and Nehr, Sascha and Rohrer, Franz and
                      Tillmann, Ralf and Wegener, Robert and Hofzumahaus, Andreas
                      and Kiendler-Scharr, Astrid and Wahner, Andreas and Fuchs,
                      Hendrik},
      title        = {{I}nvestigation of the α -pinene photooxidation by {OH} in
                      the atmospheric simulation chamber {SAPHIR}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {19},
      number       = {18},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-04919},
      pages        = {11635 - 11649},
      year         = {2019},
      abstract     = {The photooxidation of the most abundant monoterpene,
                      α-pinene, by the hydroxyl radical (OH) was investigated at
                      atmospheric concentrations in the atmospheric simulation
                      chamber SAPHIR. Concentrations of nitric oxide (NO) were
                      below 120 pptv. Yields of organic oxidation products are
                      determined from measured time series giving values of
                      0.11±0.05, 0.19±0.06, and 0.05±0.03 for formaldehyde,
                      acetone, and pinonaldehyde, respectively. The pinonaldehyde
                      yield is at the low side of yields measured in previous
                      laboratory studies, ranging from 0.06 to 0.87. These studies
                      were mostly performed at reactant concentrations much higher
                      than observed in the atmosphere. Time series of measured
                      radical and trace-gas concentrations are compared to results
                      from model calculations applying the Master Chemical
                      Mechanism (MCM) 3.3.1. The model predicts pinonaldehyde
                      mixing ratios that are at least a factor of 4 higher than
                      measured values. At the same time, modeled hydroxyl and
                      hydroperoxy (HO2) radical concentrations are approximately
                      $25 \%$ lower than measured values. Vereecken et al.
                      (2007) suggested a shift of the initial organic peroxy
                      radical (RO2) distribution towards RO2 species that do not
                      yield pinonaldehyde but produce other organic products.
                      Implementing these modifications reduces the
                      model–measurement gap of pinonaldehyde by $20 \%$ and
                      also improves the agreement in modeled and measured radical
                      concentrations by $10 \%.$ However, the chemical oxidation
                      mechanism needs further adjustment to explain observed
                      radical and pinonaldehyde concentrations. This could be
                      achieved by adjusting the initial RO2 distribution, but
                      could also be done by implementing alternative reaction
                      channels of RO2 species that currently lead to the formation
                      of pinonaldehyde in the model.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000486704600001},
      doi          = {10.5194/acp-19-11635-2019},
      url          = {https://juser.fz-juelich.de/record/865539},
}