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@ARTICLE{Vogel:29695,
      author       = {Vogel, B. and Stroh, F. and Grooß, J. U. and Müller, R.
                      and Deshler, M. C. and Karhu, J. and McKenna, D. S. and
                      Müller, M. and Toohey, D. and Toon, G.},
      title        = {{V}ertical profiles of activated {C}l{O} and ozone loss in
                      the {A}rctic vortex in {J}anuary and {M}arch 2000: {I}n-situ
                      observations and model simulations},
      journal      = {Journal of Geophysical Research},
      volume       = {108},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-29695},
      pages        = {8334},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {[ 1] In situ observations of ClO mixing ratios obtained
                      from a balloonborne instrument launched in Kiruna on 27
                      January 2000 and on 1 March 2000 are presented. ClO mixing
                      ratios and quasi- simultaneously observed ozone loss are
                      compared to model simulations performed with the Chemical
                      Lagrangian Model of the Stratosphere ( CLaMS). ClO mixing
                      ratios are simulated initializing the model simulations for
                      early winter conditions. Sensitivity studies are performed
                      to explore the impact of the surface area of the background
                      aerosol, of denitrification, and of the recently reported
                      kinetics of the ClO self- reaction [ Bloss et al., 2001] on
                      simulated ClO. For 27 January 2000, model simulations agree
                      with rate constants reported by Bloss et al. [ 2001],
                      whereas for 1 March 2000 simulations employing rate
                      constants reported by Bloss et al. [ 2001] and by Sander et
                      al. [ 2000] reproduce the ClO measurements. The impact of
                      uncertainties arising from accumulated errors along the
                      calculated backward trajectories and uncertainties within
                      temperatures derived from the UK Met Office are also
                      studied. For both flights, simulated ClO show a good overall
                      agreement with measured ClO within uncertainties arising
                      from accumulated errors along air parcel histories. We find
                      a layer of low ClO mixing ratios < 100 pptv between 600 and
                      620 K for the flight on 27 January 2000 and between 525 and
                      550 K on 1 March 2000. For this layer, measured ClO is
                      substantially lower than simulated ClO. Potential causes are
                      discussed, but the discrepancy remains unexplained at
                      present. Furthermore, for 1 March 2000, an overall agreement
                      is found between model simulations and measurements by the
                      HALOE instrument of HCl and NOx (= NO + NO2) for all
                      altitudes considered. We conclude that denitrification
                      occurred up to a potential temperature of approximate to 550
                      K ( approximate to 24 km altitude) on 1 March 2000. Finally,
                      model simulations show that between late January and 1
                      March, a significant ozone loss of about 0.8 - 1.8 ppmv is
                      derived between 425 and 490 K of potential temperature in
                      agreement with measured ozone loss and correlated with the
                      enhanced ClO. For 1 March 2000, 77 +/- 10 DU is obtained as
                      an estimate of the loss in column ozone.},
      keywords     = {J (WoSType)},
      cin          = {ICG-I},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000186941100001},
      doi          = {10.1029/2002JD002564},
      url          = {https://juser.fz-juelich.de/record/29695},
}