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@ARTICLE{Konopka:834817,
      author       = {Konopka, Paul and Ploeger, Felix and Tao, Mengchu and
                      Riese, Martin},
      title        = {{R}egionally resolved diagnostic of transport: {A}
                      simplified forward model for {CO}$_{2}$},
      journal      = {Journal of the atmospheric sciences},
      volume       = {},
      issn         = {1520-0469},
      address      = {Boston, Mass.},
      publisher    = {American Meteorological Soc.},
      reportid     = {FZJ-2017-04708},
      pages        = {2689},
      year         = {2017},
      abstract     = {Simply diagnostic tools are useful to understand transport
                      processes in complex chemistry transport models (CTMs). For
                      this purpose, a combined use of the air-mass origin
                      fractions (AOFs) and regionally resolved mean ages (RMAs) is
                      presented. This approach merges the concept of the origin of
                      air with the well-known theory of the mean age of air (AoA)
                      for different regions covering the whole Earth. We show how
                      the AoA calculated relative to the Earth’s surface can be
                      decomposed into regionally resolved components (i.e. into
                      RMAs). Using both AOFs and RMAs, we discuss differences in
                      the seasonality of transport from the northern and southern
                      hemispheres into the tropical tropopause layer (TTL), the
                      asymmetries of the interhemispheric exchange as well as
                      differences in relation to the continental or oceanic origin
                      of air. Furthermore, a simplified transport model for a
                      chemically passive species (tracer) is formulated, which has
                      some potential to approximate the full transport within a
                      CTM. This analytic approach uses the AOFs as well as the
                      RMAs as parameters to propagate a tracer prescribed on the
                      Earth’s surface (lower boundary condition). This method is
                      exactly valid for sources which change linearly with time in
                      each of the considered regions. We analyze how well this
                      approach approximates the propagation of CO2 from the
                      planetary boundary layer (PBL) into the whole atmosphere.
                      The CO2 values in the PBL are specified by the CarbonTracker
                      data set. We discuss how this approach can be used for
                      inverse modeling of CO2.},
      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:000409133100015},
      doi          = {10.1175/JAS-D-16-0367.1},
      url          = {https://juser.fz-juelich.de/record/834817},
}