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@BOOK{Gomm:155065,
      author       = {Gomm, Sebastian},
      title        = {{L}uftgestützte {M}essung von
                      {HO}$_{x}$-{R}adikalkonzentrationen mittels
                      {L}aser-induzierter {F}luoreszenz auf einem {Z}eppelin {NT}:
                      {U}ntersuchung der atmosphärischen {O}xidationsstärke der
                      unteren {T}roposphäre},
      volume       = {224},
      school       = {Universität Wuppertal},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2014-04250},
      isbn         = {978-3-89336-981-2},
      series       = {Schriften des Forschungszentrums Jülich, Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {205 S.},
      year         = {2014},
      note         = {Universität Wuppertal, Diss., 2014},
      abstract     = {The OH radical is the major atmospheric oxidant that
                      dominates the photochemical degradationof trace gases and
                      pollutants in the atmosphere. The consumed OH can be
                      recycledthrough the HO$_{2}$ radical by reacting with NO,
                      thereby forming ozone. Thus, OH and HO$_{2}$ are ideal
                      parameter in order to test the current understanding of the
                      atmospheric degradation of trace gases. In this work, an
                      instrument for the measurement of OH and HO$_{2}$ radicals
                      by laser induced fluorescence was developed and deployed on
                      board a Zeppelin NT. The measurements presented here were
                      conducted in July and August 2012 in the region Emilia
                      Romagna in Northern Italy. The measurement platform Zeppelin
                      NT allowed the observation of a comprehensive set of
                      chemical and physical parameter within the lower troposphere
                      between 75 − 900m above ground. During the measurement
                      flights, strong trace gas gradients were observed in the
                      early morning that could be explained by the layering within
                      the lanetary Boundary Layer. Typically, low trace gas
                      concentrations were found in the residual layer in high
                      altitudes whereas the highest OH reactivities up to 10
                      s$^{−1}$ and NO$_{x}$ mixing ratios up to 10 ppbv were
                      observed in the mixed layer which is strongly influenced by
                      ground emissions. The linear correlation between observed OH
                      and j(O$^{1}$D) with a slope of 4.4 × 10$^{11}$
                      cm$^{−3}$s is comparable to other field measurements in
                      continental regions. Additionally, the observed OH depends
                      nonlinearly on NO$_{x}$ resulting in enhanced mean OH
                      concentrations by a factor of 2 for NO$_{x}$ mixing ratios
                      between 1.5 and 2.0 ppbv. Observed mean HO$_{2}$
                      concentrations in air masses with [NO] < 250 pptv were up to
                      a factor of 5 higher than in air masses with [NO] > 1 ppbv.
                      For the first time, this HO$_{x}$ dependency on NO$_{x}$ was
                      observed locally when crossing vertical and horizontal
                      NO$_{x}$ gradients. Box model calculations based on the
                      Regional Atmospheric Chemistry Mechanism reproduce the
                      measured OH for [NO$_{x}$] < 3 ppbv. For higher NO$_{x}$
                      mixing ratios, the model overestimates OH for more than 50\%
                      of the data points. The model predicts HO$_{2}$ within the
                      uncertainty of the measurements and the model. The
                      prediction for OH could be improved by implementing a newly
                      proposed gas phase machanism forming HONO (Li et al., 2014).
                      The analysis of the HO$_{x}$ data does not hint at a
                      significant NO independent, non-classical OH-recycling
                      during the measurement flights performed in Italy.},
      organization  = {(Germany)},
      cin          = {IEK-8},
      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)3},
      url          = {https://juser.fz-juelich.de/record/155065},
}