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@ARTICLE{Stiller:838635,
      author       = {Stiller, Gabriele P. and Fierli, Federico and Ploeger,
                      Felix and Cagnazzo, Chiara and Funke, Bernd and Haenel,
                      Florian J. and Reddmann, Thomas and Riese, Martin and von
                      Clarmann, Thomas},
      title        = {{S}hift of subtropical transport barriers explains observed
                      hemispheric asymmetry of decadal trends of age of air},
      journal      = {Atmospheric chemistry and physics},
      volume       = {17},
      number       = {18},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2017-07208},
      pages        = {11177 - 11192},
      year         = {2017},
      abstract     = {In response to global warming, the Brewer–Dobson
                      circulation in the stratosphere is expected to accelerate
                      and the mean transport time of air along this circulation to
                      decrease. This would imply a negative stratospheric age of
                      air trend, i.e. an air parcel would need less time to travel
                      from the tropopause to any point in the stratosphere. Age of
                      air as inferred from tracer observations, however, shows
                      zero to positive trends in the northern mid-latitude
                      stratosphere and zonally asymmetric patterns. Using
                      satellite observations and model calculations we show that
                      the observed latitudinal and vertical patterns of the
                      decadal changes of age of air in the lower to middle
                      stratosphere during the period 2002–2012 are predominantly
                      caused by a southward shift of the circulation pattern by
                      about 5°. After correction for this shift, the observations
                      reveal a hemispherically almost symmetric decrease of age of
                      air in the lower to middle stratosphere up to 800 K of up
                      to −0.25 years over the 2002–2012 period with strongest
                      decrease in the northern tropics. This net change is
                      consistent with long-term trends from model predictions.},
      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:000411363100001},
      doi          = {10.5194/acp-17-11177-2017},
      url          = {https://juser.fz-juelich.de/record/838635},
}