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@ARTICLE{Kaminski:824979,
      author       = {Kaminski, Martin and Fuchs, Hendrik and Acir, Ismail-Hakki
                      and Bohn, Birger and Brauers, Theo and Dorn, Hans-Peter and
                      Häseler, Rolf and Hofzumahaus, Andreas and Li, Xin and
                      Lutz, Anna and Nehr, Sascha and Rohrer, Franz and Tillmann,
                      Ralf and Vereecken, Luc and Wegener, Robert and Wahner,
                      Andreas},
      title        = {{I}nvestigation of the β-pinene photooxidation by {OH} in
                      the atmosphere simulation chamber {SAPHIR}},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-07475},
      pages        = {},
      year         = {2016},
      abstract     = {Beside isoprene, monoterpenes are the non-methane volatile
                      organic compounds (VOC) with the highest global emission
                      rates. Due to their high reactivity towards OH, monoterpenes
                      can dominate the radical chemistry of the atmosphere in
                      forested areas. In the present study the photochemical
                      degradation mechanism of β-pinene was investigated in the
                      Jülich atmosphere simulation chamber SAPHIR. The focus of
                      this study is on the OH budget in the degradation process.
                      Therefore the SAPHIR chamber was equipped with
                      instrumentation to measure radicals (OH, HO2, RO2), the
                      total OH reactivity, important OH precursors (O3, HONO,
                      HCHO), the parent VOC beta-pinene, its main oxidation
                      products, acetone and nopinone, and photolysis frequencies.
                      All experiments were carried out under low NOx conditions
                      (≤ 2 ppb) and at atmospheric beta-pinene
                      concentrations (≤ 5 ppb) with and without addition of
                      ozone. For the investigation of the OH budget, the OH
                      production and destruction rates were calculated from
                      measured quantities. Within the limits of accuracy of the
                      instruments, the OH budget was balanced in all β-pinene
                      oxidation experiments. However, even though the OH budget
                      was closed, simulation results from the Master Chemical
                      Mechanism 3.2 showed that the OH production and destruction
                      rates were underestimated by the model. The measured OH and
                      HO2 concentrations were underestimated by up to a factor of
                      two whereas the total OH reactivity was slightly
                      overestimated because of the poor reproduction of the
                      measured nopinone by the model by up to a factor of three. A
                      new, theory-derived first-generation product distribution by
                      Vereecken and Peeters was able to reproduce the measured
                      nopinone time series and the total OH reactivity.
                      Nevertheless the measured OH and HO2 concentrations remained
                      underestimated by the numerical simulations. These
                      observations together with the fact that the measured OH
                      budget was closed suggest the existence of unaccounted
                      sources of HO2.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-2016-1016},
      url          = {https://juser.fz-juelich.de/record/824979},
}