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@ARTICLE{Krasauskas:858152,
      author       = {Krasauskas, Lukas and Ungermann, Jörn and Ensmann, Stefan
                      and Krisch, Isabell and Kretschmer, Erik and Preusse, Peter
                      and Riese, Martin},
      title        = {{T}omographic airborne limb sounder retrievals on irregular
                      grid with second order regularisation},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {199},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2018-07059},
      pages        = {1 - 27},
      year         = {2018},
      abstract     = {Multiple limb sounder measurements of the same atmospheric
                      region taken from different directions can be combined in a
                      3D tomographic retrieval. Mathematically, this is a
                      computationally expensive inverse modelling problem. It
                      typically requires an introduction of some general knowledge
                      of the atmosphere (regularisation) due to its
                      underdetermined nature.This paper introduces a consistent,
                      physically motivated (no ad-hoc unphysical parameters)
                      variant of the Tikhonov regularisation scheme based on
                      spatial derivatives of first and second order. As shown by a
                      case study with synthetic data, this scheme, combined with
                      irregular grid retrieval methods, improves both upon the
                      quality and the computational cost of 3D tomography, while
                      eliminating grid dependence and the need to tune parameters
                      for each use case. The few physical parameters required can
                      be derived from in situ measurements and model data. An
                      efficient Monte Carlo technique was adopted for retrieval
                      accuracy estimation.},
      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},
      doi          = {10.5194/amt-2018-199},
      url          = {https://juser.fz-juelich.de/record/858152},
}