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@ARTICLE{Vogel:824765,
      author       = {Vogel, Bärbel and Günther, Gebhard and Müller, Rolf and
                      Grooß, Jens-Uwe and Afchine, Armin and Bozem, Heiko and
                      Hoor, Peter and Krämer, Martina and Müller, Stefan and
                      Riese, Martin and Rolf, Christian and Spelten, Nicole and
                      Stiller, Gabriele P. and Ungermann, Jörn and Zahn, Andreas},
      title        = {{L}ong-range transport pathways of tropospheric source
                      gases originating in {A}sia into the northern lower
                      stratosphere during the {A}sian monsoon season 2012},
      journal      = {Atmospheric chemistry and physics},
      volume       = {16},
      number       = {23},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-07320},
      pages        = {15301 - 15325},
      year         = {2016},
      abstract     = {Global simulations with the Chemical Lagrangian Model of
                      the Stratosphere (CLaMS) using artificial tracers of air
                      mass origin are used to analyze transport mechanisms from
                      the Asian monsoon region into the lower stratosphere. In a
                      case study, the transport of air masses from the Asian
                      monsoon anticyclone originating in India/China by an
                      eastward-migrating anticyclone which broke off from the main
                      anticyclone on 20 September 2012 and filaments separated at
                      the northeastern flank of the anticyclone are analyzed.
                      Enhanced contributions of young air masses (younger than 5
                      months) are found within the separated anticyclone confined
                      at the top by the thermal tropopause. Further, these air
                      masses are confined by the anticyclonic circulation and, on
                      the polar side, by the subtropical jet such that the
                      vertical structure resembles a bubble within the upper
                      troposphere. Subsequently, these air masses are transported
                      eastwards along the subtropical jet and enter the lower
                      stratosphere by quasi-horizontal transport in a region of
                      double tropopauses most likely associated with Rossby wave
                      breaking events. As a result, thin filaments with enhanced
                      signatures of tropospheric trace gases were measured in the
                      lower stratosphere over Europe during the TACTS/ESMVal
                      campaign in September 2012 in very good agreement with CLaMS
                      simulations. Our simulations demonstrate that source regions
                      in Asia and in the Pacific Ocean have a significant impact
                      on the chemical composition of the lower stratosphere of the
                      Northern Hemisphere. Young, moist air masses, in particular
                      at the end of the monsoon season in September/October 2012,
                      flooded the extratropical lower stratosphere in the Northern
                      Hemisphere with contributions of up to $ ≈  30 \%$
                      at 380 K (with the remaining fraction being aged air). In
                      contrast, the contribution of young air masses to the
                      Southern Hemisphere is much lower. At the end of October
                      2012, approximately 1.5 ppmv H2O is found in the lower
                      Northern Hemisphere stratosphere (at 380 K) from source
                      regions both in Asia and in the tropical Pacific compared to
                      a mean water vapor content of  ≈  5 ppmv. In
                      addition to this main transport pathway from the Asian
                      monsoon anticyclone to the east along the subtropical jet
                      and subsequent transport into the northern lower
                      stratosphere, a second horizontal transport pathway out of
                      the anticyclone to the west into the tropics (TTL) is found
                      in agreement with MIPAS HCFC-22 measurements.},
      cin          = {IEK-7 / JARA-HPC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013 / $I:(DE-82)080012_20140620$},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244) / Chemisches Lagrangesches
                      Modell der Stratosphäre(CLaMS) $(jicg11_20160501)$},
      pid          = {G:(DE-HGF)POF3-244 / $G:(DE-Juel1)jicg11_20160501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000390767800004},
      doi          = {10.5194/acp-16-15301-2016},
      url          = {https://juser.fz-juelich.de/record/824765},
}