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@ARTICLE{Ungermann:823851,
      author       = {Ungermann, Jörn and Ern, Mandfred and Kaufmann, Martin and
                      Müller, Rolf and Spang, Reinhold and Ploeger, Felix and
                      Vogel, Bärbel and Riese, Martin},
      title        = {{O}bservations of {PAN} and its confinement in the {A}sian
                      summer monsoon anticyclone in high spatial resolution},
      journal      = {Atmospheric chemistry and physics},
      volume       = {16},
      number       = {13},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-06491},
      pages        = {8389 - 8403},
      year         = {2016},
      abstract     = {This paper presents an analysis of trace gases in the Asian
                      summer monsoon (ASM) region on the basis of observations by
                      the CRISTA infrared limb sounder taken in low-earth orbit in
                      August 1997. The spatially highly resolved measurements of
                      peroxyacetyl nitrate (PAN) and O3 allow a detailed analysis
                      of an eddy-shedding event of the ASM anticyclone. We
                      identify enhanced PAN volume mixing ratios (VMRs) within the
                      main anticyclone and within the eddy, which are suitable as
                      a tracer for polluted air originating in India and China.
                      Plotting the retrieved PAN VMRs against potential vorticity
                      (PV) and potential temperature reveals that the PV value at
                      which the PAN VMRs exhibit the strongest decrease with
                      respect to PV increases with potential temperature. These PV
                      values might be used to identify the extent of the ASM.
                      Using temperature values also derived from CRISTA
                      measurements, we also computed the location of the thermal
                      tropopause according to the WMO criterion and find that it
                      confines the PAN anomaly vertically within the main ASM
                      anticyclone. In contrast, the shed eddy exhibits enhanced
                      PAN VMRs for 1 to 2 km above the thermal tropopause. Using
                      the relationship between PAN as a tropospheric tracer and O3
                      as a stratospheric tracer to identify mixed air parcels, we
                      further found the anticyclone to contain few such air
                      parcels, whereas the region between the anticyclone and the
                      eddy as well as the eddy itself contains many mixed air
                      parcels. In combination, this implies that while the
                      anticyclone confines polluted air masses well, eddy shedding
                      provides a very rapid horizontal transport pathway of Asian
                      pollution into the extratropical lowermost stratosphere with
                      a timescale of only a few days.},
      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:000381091400021},
      doi          = {10.5194/acp-16-8389-2016},
      url          = {https://juser.fz-juelich.de/record/823851},
}