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@ARTICLE{Nehr:155681,
      author       = {Nehr, Sascha and Bohn, Birger and Dorn, Hans-Peter and
                      Fuchs, Hendrik and Häseler, Rolf and Hofzumahaus, Andreas
                      and Li, Xin and Rohrer, Franz and Tillmann, Ralf and Wahner,
                      Andreas},
      title        = {{A}tmospheric photochemistry of aromatic hydrocarbons: {OH}
                      budgets during {SAPHIR} chamber experiments},
      journal      = {Atmospheric chemistry and physics},
      volume       = {14},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2014-04734},
      pages        = {6941 - 6952},
      year         = {2014},
      abstract     = {Current photochemical models developed to simulate the
                      atmospheric degradation of aromatic hydrocarbons tend to
                      underestimate OH radical concentrations. In order to analyse
                      OH budgets, we performed experiments with benzene, toluene,
                      p-xylene and 1,3,5-trimethylbenzene in the atmosphere
                      simulation chamber SAPHIR. Experiments were conducted under
                      low-NO conditions (typically 0.1–0.2 ppb) and high-NO
                      conditions (typically 7–8 ppb), and starting
                      concentrations of 6–250 ppb of aromatics, dependent on OH
                      rate constants. For the OH budget analysis a steady-state
                      approach was applied in which OH production and destruction
                      rates (POH and DOH) have to be equal. The POH were
                      determined from measurements of HO2, NO, HONO, and O3
                      concentrations, considering OH formation by photolysis and
                      recycling from HO2. The DOH were calculated from
                      measurements of the OH concentrations and total OH
                      reactivities. The OH budgets were determined from DOH/POH
                      ratios. The accuracy and reproducibility of the approach
                      were assessed in several experiments using CO as a reference
                      compound where an average ratio DOH/POH = 1.13 ± 0.19 was
                      obtained. In experiments with aromatics, these ratios ranged
                      within 1.1–1.6 under low-NO conditions and 0.9–1.2 under
                      high-NO conditions. The results indicate that OH budgets
                      during photo-oxidation experiments with aromatics are
                      balanced within experimental accuracies. Inclusion of a
                      further, recently proposed OH production via HO2 + RO2
                      reactions led to improvements under low-NO conditions but
                      the differences were small and insignificant within the
                      experimental errors.},
      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:000339244600028},
      doi          = {10.5194/acp-14-6941-2014},
      url          = {https://juser.fz-juelich.de/record/155681},
}