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@ARTICLE{Ploeger:13851,
      author       = {Ploeger, F. and Fueglistaler, S. and Grooß, J.-U. and
                      Günther, G. and Konopka, P. and Liu, Y.S. and Müller, R.
                      and Ravegnani, F. and Schiller, C. and Ulanovski, A. and
                      Riese, M.},
      title        = {{I}nsight from ozone and water vapour on transport in the
                      tropical tropopause layer ({TTL})},
      journal      = {Atmospheric chemistry and physics},
      volume       = {11},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-13851},
      pages        = {407 - 419},
      year         = {2011},
      note         = {We thank T. Birner for helpful discussions, N. Thomas for
                      programming support, M. Park for providing a SHADOZ-based
                      ozone climatology and the ECMWF for reanalysis data support.
                      F. Ploeger further thanks COST/WaVaCS (European Cooperation
                      for Science and Technology/Atmospheric Water Vapour in the
                      Climate System action) for funding a short term scientific
                      mission at DAMTP/Cambridge, where main ideas for this work
                      were developed.},
      abstract     = {We explore the potential of ozone observations to constrain
                      transport processes in the tropical tropopause layer (TTL),
                      and contrast it with insights that can be obtained from
                      water vapour. Global fields from Halogen Occultation
                      Experiment (HALOE) and in-situ observations are predicted
                      using a backtrajectory approach that captures advection,
                      instantaneous freeze-drying and photolytical ozone
                      production. Two different representations of transport
                      (kinematic and diabatic 3-month backtrajectories based on
                      ERA-Interim data) are used to evaluate the sensitivity to
                      differences in transport. Results show that mean profiles
                      and seasonality of both tracers can be reasonably
                      reconstructed. Water vapour predictions are similar for both
                      transport representations, but predictions for ozone are
                      systematically higher for kinematic transport. Compared to
                      global HALOE observations, the diabatic model prediction
                      underestimates the vertical ozone gradient. Comparison of
                      the kinematic prediction with observations obtained during
                      the tropical SCOUT-O3 campaign shows a large high bias above
                      390K potential temperature. We show that ozone predictions
                      and vertical dispersion of the trajectories are highly
                      correlated, rendering ozone an interesting tracer for
                      aspects of transport to which water vapour is not sensitive.
                      We show that dispersion and mean upwelling have similar
                      effects on ozone profiles, with slower upwelling and larger
                      dispersion both leading to higher ozone concentrations.
                      Analyses of tropical upwelling based on mean transport
                      characteristics, and model validation have to take into
                      account this ambiguity between tropical ozone production and
                      in-mixing from the stratosphere. In turn, ozone provides
                      constraints on transport in the TTL and lower stratosphere
                      that cannot be obtained from water vapour.},
      keywords     = {J (WoSType)},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000286180200027},
      doi          = {10.5194/acp-11-407-2011},
      url          = {https://juser.fz-juelich.de/record/13851},
}