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@ARTICLE{Pan:17225,
      author       = {Pan, L.L. and Kunz, A. and Homeyer, C.R. and Munchak, L.a.},
      title        = {{C}ommentary on using equivalent latitude in the upper
                      troposphere and lower stratosphere},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {11},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-17225},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We discuss the use of potential vorticity (PV) based
                      equivalent latitude (EqLat) and potential temperature (θ)
                      coordinates in the upper troposphere and lower stratosphere
                      (UTLS) for chemical transport studies. The main objective is
                      to provide a cautionary note on using EqLat–θ coordinates
                      for aggregating chemical tracers in the UTLS. Several
                      examples are used to show 3-D distributions of EqLat
                      together with chemical constituents for a range of θ. We
                      show that the use of PV–θ coordinates may not be suitable
                      for several reasons when tropospheric processes are an
                      important part of a study. Due to the different static
                      stability structures between the stratosphere and
                      troposphere, the use of θ as a vertical coordinate does not
                      provide equal representations of the UT and LS. Since the θ
                      surfaces are often quasi-vertical in the troposphere, the θ
                      coordinate does not work well distinguishing the UT from the
                      boundary layer. We further discuss the duality of PV/EqLat
                      as a tracer versus as a coordinate variable. Using an
                      example, we show that while PV/EqLat serves well as a
                      transport tracer in the UTLS region, it may misrepresent the
                      effect of transport when used as a coordinate to average
                      chemical tracers. Overall, when choosing these coordinates,
                      considerations need to be made not only based on the time
                      scale of PV being a conservative tracer, but also the
                      specific research questions to be addressed.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-11-33095-2011},
      url          = {https://juser.fz-juelich.de/record/17225},
}