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@ARTICLE{Ploeger:203189,
      author       = {Ploeger, F. and Abalos, M. and Birner, T. and Konopka, P.
                      and Legras, B. and Müller, Rolf and Riese, M.},
      title        = {{Q}uantifying the effects of mixing and residual
                      circulation on trends of stratospheric mean age of air},
      journal      = {Geophysical research letters},
      volume       = {42},
      number       = {6},
      issn         = {0094-8276},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2015-05190},
      pages        = {2047 - 2054},
      year         = {2015},
      abstract     = {It is an outstanding issue to what degree trends in
                      stratospheric mean age of air reflect changes in the (slow)
                      residual circulation and how they are affected by (fast)
                      eddy mixing. We present a method to quantify the effects of
                      mixing and residual circulation on mean age trends, based on
                      simulations with the Chemical Lagrangian Model of the
                      Stratosphere (CLaMS) driven by ERA-Interim reanalysis and on
                      the integrated tracer continuity equation. During
                      1990–2013, mean age decreases throughout most of the
                      stratosphere, qualitatively consistent with results based on
                      climate model simulations. During 2002–2012, age changes
                      show a clear hemispheric asymmetry in agreement with
                      satellite observations. We find that changes in the residual
                      circulation transit time cannot explain the mean age trends,
                      and including the integrated effect of mixing is crucial.
                      Above about 550 K (about 22 km), trends in the mixing effect
                      on mean age appear to be coupled to residual circulation
                      changes.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000353170000055},
      doi          = {10.1002/2014GL062927},
      url          = {https://juser.fz-juelich.de/record/203189},
}