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@PHDTHESIS{Winkler:32552,
      author       = {Winkler, Ulf},
      title        = {{C}l{O} in der arktischen {S}tratosphäre : {K}onsequenzen
                      für das {V}erständnis von {W}ellen- und
                      {M}ischungsprozessen im arktischen {P}olarwirbel aus einer
                      {B}allonmessung vom 11. {F}ebruar 1997 in {K}iruna},
      volume       = {4108},
      issn         = {0944-2952},
      school       = {Univ. Bonn},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-32552, Juel-4108},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {179 p.},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012; Bonn, Univ., Diss.,
                      2003},
      abstract     = {On 11$^{th}$ February, 1997, the TRIPLE balloon was
                      launched in Kiruna, Northern Sweden. It ascended into the
                      lower stratosphere, reached a maximum altitude of 24.1 km
                      and landed in Northern Finland after a 2.5-hour flight.
                      Thanks to advantageous meteorological conditions the balloon
                      passed through the edge region of the polar vortex.
                      Moreover, the data of the TRIPLE flight show that on that
                      day a wave event occurred. The edge region of the polar
                      vortex is of interest because the phenomenon of the polar
                      vortex is closely related to the springtime ozone loss, also
                      known as the ozone hole. Under certain circumstances, the
                      air inside the vortex is forced to remain under polar night
                      conditions for a period of months. Due to the low
                      temperatures reactive chlorine compounds are formed. After
                      the return of sunlight in springtime especially the ClO
                      radical acts as a catalyst of massive ozone depletion. The
                      stability of the polar vortex and the action of the vortex
                      edge as a transport barrier are decisive factors for the
                      extent of ozone depletion. On the gondola of the TRIPLE
                      balloon several instruments were mounted for the measurement
                      of various molecules, among them the ClO/BrO instrument of
                      Research Centre Jülich, an ozone sounding device from the
                      University of Wyoming and the BONBON cryosampler from Johann
                      Wolfgang von Goethe University, Frankfurt am Main.
                      Consequently it was possible to simultaneously observe the
                      wave event and its consequences for the chemistry in the air
                      masses in question. The measured ClO profile thus acted as
                      an indicator of the lowest temperature experienced by the
                      respective air parcel during the event. As the most probable
                      simultaneous explanation for the observed ClO, temperature
                      and pressure profiles a wave standing perpendicular to the
                      earth’s surface is suggested. Chemistry and transport
                      calculations by means of the Chemical Lagrangian Model of
                      the Stratosphere (CLaMS) support this assumption. A
                      theoretical examination shows that such an event can cause
                      horizontal mixing processes. Indeed, the ozone profile
                      measured on the TRIPLE gondola provides indications of an
                      intrusion of ozone-rich air masses originating from the
                      outer vortex edge area or even from outside the polar
                      vortex. This assumption was verified by the tracer-tracer
                      method utilizing the N2O profile of the BONBON cryosampler.
                      Besides these theoretical examinations and considerations,
                      this work also contains a practical part. The working
                      principle of the ClO/BrO instrument, the Chemical Conversion
                      and Resonance Fluorescence (CCRF) method, is explained. The
                      calibration of the instrument and difficulties in measuring
                      BrO by the CCRF method are discussed. Moreover, studies are
                      presented relating to the development of the HALOX aircraft
                      instrument , a modified version of the balloon instrument
                      which has been operated since the end of 2001 on board the
                      Russian high-altitude research aircraft "Geophysica".},
      cin          = {ICG-I},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/32552},
}