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@ARTICLE{Ploeger:279377,
      author       = {Ploeger, F. and Gottschling, C. and Griessbach, Sabine and
                      Grooss, Jens-Uwe and Günther, Gebhard and Konopka, P. and
                      Müller, Rolf and Riese, M. and Stroh, F. and Tao, M. and
                      Ungermann, J. and Vogel, B. and von Hobe, M.},
      title        = {{A} potential vorticity-based determination of the
                      transport barrier in the {A}sian summer monsoon anticyclone},
      journal      = {Atmospheric chemistry and physics},
      volume       = {15},
      number       = {22},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-07389},
      pages        = {13145 - 13159},
      year         = {2015},
      abstract     = {The Asian summer monsoon provides an important pathway of
                      tropospheric source gases and pollution into the lower
                      stratosphere. This transport is characterized by deep
                      convection and steady upwelling, combined with confinement
                      inside a large-scale anticyclonic circulation in the upper
                      troposphere and lower stratosphere (UTLS). In this paper, we
                      show that a barrier to horizontal transport along the 380 K
                      isentrope in the monsoon anticyclone can be determined from
                      a local maximum in the gradient of potential vorticity (PV),
                      following methods developed for the polar vortex (e.g., Nash
                      et al., 1996). The monsoon anticyclone is dynamically highly
                      variable and the maximum in the PV gradient is weak, such
                      that additional constraints are needed (e.g., time
                      averaging). Nevertheless, PV contours in the monsoon
                      anticyclone agree well with contours of trace gas mixing
                      ratios (CO, O3) and mean age from model simulations with a
                      Lagrangian chemistry transport model (CLaMS) and satellite
                      observations from the Microwave Limb Sounder (MLS)
                      instrument. Hence, the PV-based transport barrier reflects
                      the separation between air inside the core of the
                      anticyclone and the background atmosphere well. For the
                      summer season 2011 we find an average PV value of 3.6 PVU
                      for the transport barrier in the anticyclone on the 380 K
                      isentrope.},
      cin          = {IEK-7 / JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013 / I:(DE-Juel1)JSC-20090406},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244) / 511 - Computational Science
                      and Mathematical Methods (POF3-511) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-244 / G:(DE-HGF)POF3-511 /
                      G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000365977100027},
      doi          = {10.5194/acp-15-13145-2015},
      url          = {https://juser.fz-juelich.de/record/279377},
}