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@TECHREPORT{Poppe:136133,
      author       = {Poppe, Dirk and Zimmermann, Joerg and Bauer, Reimar and
                      Institut für Atmosphärische Chemie (Jülich, 3) - ICG3},
      title        = {{A} comparison of measured {OH} concentrations with model
                      calculations},
      volume       = {2951},
      number       = {Juel-2951},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136133, Juel-2951},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {44 S.},
      year         = {1994},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {The influence of chemical precursors and sunlight on the
                      atmospheric OH abundance is investigated by a comparison of
                      locally measured tropospheric OH concentration with model
                      calculations. The latter are based on the gas phase reaction
                      mechanism of the Regional Acid Deposition Model (RADM2)
                      which incorporates an explicit inorganic and a comprehensive
                      organic chemistry. The experimental data were obtained in
                      the planetary boundary layer during two sets of campaigns.
                      In Deuselbach (1983) and Schauinsland (1984) rural
                      conditions were encountered with NO, concentrations on the
                      average of 2.2 ppb and 0.9 ppb, respectively. This data set
                      was already compared with model calculations based upon an
                      older and less detailed chemical reaction scheme (Pemer et
                      al., 1987). Since then the experimental data were reanalysed
                      leading to modified measured OH concentrations and also to
                      modified precursor concentrations. For a consistent
                      comparison with the more recent campaigns in JOlich (1987
                      and 1988) we have redone the calculations. The modeled and
                      measured OH-concentrations of the campaigns in 1983 and 1984
                      correlate well with a coefficient of correlation of r =
                      0.73. The model overpredicts OH by about $20\%.$ Under more
                      polluted conditions in JOlich with average NO,
                      concentrations of 4 ppb the correlation coefficient between
                      experimental and modeled data are significantly smaller (r =
                      0.61). Possible reasons are the influence of not measured
                      precursors, for example isoprene, and the inapplicability of
                      a quasi steady state model under the spatially inhomogeneous
                      conditions in JOlich. Again the model overpredicts the OH
                      concentration by about $15\%,$ which is somewhat smaller
                      than for the rural case. The precision of the comparison is
                      limited by the uncertainties of the chemical reaction rate
                      constants.},
      cin          = {ICG-3},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      shelfmark    = {UMD - Atmospheric models / UMB - Atmospheric chemistry},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136133},
}