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@TECHREPORT{Gei:136105,
      author       = {Geiß, Heiner and Volz-Thomas, Andreas and Kley, Dieter and
                      Gilge, Stefan and Institut für Chemie der Belasteten
                      Atmosphäre (Jülich, 2) and Technische Hochschule (Aachen)},
      title        = {{M}essungen von {W}asserstoffperoxid und organischen
                      {H}ydroperoxiden am {S}chauinsland im {S}chwarzwald: ein
                      {B}eitrag zur {C}harakterisierung der limitierenden
                      {F}aktoren bei der {O}zonproduktion},
      volume       = {2998},
      number       = {Juel-2998},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich},
      reportid     = {PreJuSER-136105, Juel-2998},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {166 S.},
      year         = {1994},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {Continuous measurements ofH202and organic hydroperoxides
                      were performed at the field station Schauinsland between
                      January 1989 and June 1991 using an ezyme catalysed
                      fluorescence instrument. The mixing ratios were in the range
                      of the detection limit (20 ppt) up to 4.4 ppb for ~Oz and
                      1.7 ppb for ROOR. Both Hz02 and ROOH show a strong seasonal
                      variation with maximum concentrations in summer. The
                      observed seasonal trend is in line with the photochemical
                      formation mechanism on the one hand and the main atmospheric
                      loss processes on the other hand. The mixing ratios ofHz02
                      and ROOH are strongly influenced by wet deposition. For
                      interpretation ofthe behavior ofthese substances in gas
                      phase, this influence has to be eliminated. This was
                      achieved by selecting sunny periods from the whole data set.
                      In addition, periods were selected, where production exeeds
                      chemical losses, because then, the measured concentrations
                      of photochemically produced species, in first approximation,
                      should reflect their production rates. This is the case when
                      air masses arrive at Schauinsland from the nearby city of
                      Freiburg and Rhine valley during summer and daytime.
                      Comparison of results of smog chamber experiments performed
                      by Hess et al. (1992 a.b,c) with chemical box model
                      calculations using the EURORADM mechanism (Stockwell and
                      Kley, 1994) showed, that a positive slope in the H20/Ox
                      ratio with increasing photochemical age is an indicator for
                      NOx limitation of photochemical ozone production. The box
                      model was initialized using typical NOx start concentrations
                      and VOCINOx ratios for the Schauinsland site. Analysis ofthe
                      measured concentration ratios ofH202 and Ox versus the
                      photochemical age of the air masses gave the result, that a
                      large fraction of these measurements already fall into
                      thecategory where theozone production isNOx limited. For
                      this analysis only data were used, where the station was
                      influenced by fresh anthropogenic emissions from Freiburg
                      and the Rhine Valley, i.e. the analysed air masses were
                      exposed to anthropogenic emissions later than four hours
                      before arrival at the site. Since the advected air mass from
                      other wind sectors are photochemically further processed,
                      because anthropogenic sources are more distant, it C3Jl be
                      coneluded that at Schauinsland the photochemical ozone
                      production is in most cases limited by the availibility
                      ofNOx' Since Schauinsland is relative dose to a large
                      anthropogenic pollution source, this conclusion shoud be
                      also valid for most rural areas in Europe.},
      cin          = {ICG-2},
      cid          = {I:(DE-Juel1)VDB791},
      shelfmark    = {UMB - Atmospheric chemistry},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136105},
}