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@PHDTHESIS{Khosrawi:24997,
      author       = {Khosrawi, Farahnaz},
      title        = {{M}odellierung der {B}ildung und des {W}achstums von
                      {H}$_{2}${SO}$_{4}$/{H}$_{2}${O} {A}erosolen in der
                      {S}tratosphäre und oberen {T}roposphäre},
      volume       = {3884},
      issn         = {0944-2952},
      school       = {Univ. Bonn},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-24997, Juel-3884},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {II, 115 p.},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012; Bonn, Univ., Diss.,
                      2001},
      abstract     = {The aim of this thesis was the development of a spectral
                      box model for quantitative simulations of formation and
                      growth processes of stratospheric aerosols under various
                      atmospheric conditions. The model considers the
                      microphysical processes of binary homogenous nucleation of
                      H$_{2}$SO$_{4}$ and H$_{2}$O, Brownian coagulation and the
                      diffusive gas uptake of HNO$_{3}$ and H$_{2}$O on the liquid
                      sulfate aerosol. To test the microphysical processes
                      implemented in the model sensitivity studies have been
                      performed, e. g. the HNO$_{3}$ uptake under polar
                      stratospheric conditions and the formation of aerosol
                      particles under enhanced H$_{2}$SO$_{4}$ concentrations in
                      the stratosphere, e. g. after a volcanic eruption. To verify
                      the model results of the coagulation process these have been
                      compared to an analytical solution and to other models. The
                      sensitvity studies show that formation and growth processes
                      of stratospheric aerosols can be quantitatively described by
                      the box model under unperturbed and perturbed conditions.
                      Subsequent to the sensitivity studies the microphysical box
                      model has been used to investigate condensation and growth
                      processes during STREAM 1998 (Stratosphere-Troposphere
                      Experiments by Aircraft Measurements) campaign. The box
                      model results demonstrate that the particles which have been
                      formed and dehydrated the atmosphere have an other
                      composition than H$_{2}$SO$_{4}$/H$_{2}$O and
                      H$_{2}$SO$_{4}$/H$_{2}$O/HNO$_{3}$, respectively. Studies of
                      mixing-induced formation of aerosols show that mixing of two
                      air parcels with different initial temperatures and
                      humidities can cause a. significant enhancement of
                      nucleation and condensation rates. Enhancements of
                      nucleation rates up to nine orders of magnitude can occur.
                      Since mixing of two air parcels generates high
                      supersaturations also the condensation rate will be
                      enhanced. Additionally, isentropic transport of H$_{2}$O
                      through the subtropical tropopause has been simulated with
                      CLaMS (Chemical Lagrangian Model of the Stratosphere) to
                      investigate processes which are responsible for the con
                      servation of the water vapour distribution measured by HALDE
                      (Halogen Occultation Experiment). The CLaMS results show
                      that mixing and condensation processes can contribute to the
                      conservation of the water vapour distribution.},
      cin          = {ICG-I},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Stratosphärische Chemie},
      pid          = {G:(DE-Juel1)FUEK71},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/24997},
}