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@ARTICLE{Podglajen:862049,
      author       = {Podglajen, Aurelien and Ploeger, Felix},
      title        = {{R}etrieving the age of air spectrum from tracers:
                      principle and method},
      journal      = {Atmospheric chemistry and physics},
      volume       = {19},
      number       = {3},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-02415},
      pages        = {1767 - 1783},
      year         = {2019},
      abstract     = {Surface-emitted tracers with different dependencies on
                      transit time (e.g., due to chemical loss or time-dependent
                      boundary conditions) carry independent pieces of information
                      on the age of air spectrum (the distribution of transit
                      times from the surface). This paper investigates how and to
                      what extent knowledge of tracer concentrations can be used
                      to retrieve the age spectrum. Since the mixing ratios of the
                      tracers considered depend linearly on the transit time
                      distribution, the question posed can be formulated as a
                      linear inverse problem of small dimension. An inversion
                      methodology is introduced, which does not assume a
                      prescribed shape for the spectrum. The performance of the
                      approach is first evaluated on a constructed set of
                      artificial radioactive tracers derived from idealized
                      spectra. Hereafter, the inversion method is applied to
                      outputs of a chemistry–transport model. The latter
                      experiment highlights the limits of inversions using only
                      parent radioactive tracers: they are unable to retrieve
                      fine-scale structures such as the annual cycle. Improvements
                      can be achieved by including daughter decaying tracers and
                      tracers with an annual cycle at the surface. This study
                      demonstrates the feasibility of retrieving the age spectrum
                      from tracers and has implications for transport diagnosis in
                      models and observations.},
      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:000458116900007},
      doi          = {10.5194/acp-19-1767-2019},
      url          = {https://juser.fz-juelich.de/record/862049},
}