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@ARTICLE{Ungermann:17958,
      author       = {Ungermann, J. and Blank, J. and Lotz, J. and Leppkes, K.
                      and Hoffmann, L. and Guggenmoser, T. and Kaufmann, M. and
                      Preusse, P. and Naumann, U. and Riese, M.},
      title        = {{A} 3-{D} tomographic retrieval approach with advection
                      compensation for the air-borne limb-imager {GLORIA}},
      journal      = {Atmospheric measurement techniques},
      volume       = {4},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-17958},
      pages        = {2509 - 2529},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Infrared limb sounding from aircraft can provide 2-D
                      curtains of multiple trace gas species. However,
                      conventional limb sounders view perpendicular to the
                      aircraft axis and are unable to resolve the observed airmass
                      along their line-of-sight. GLORIA (Gimballed Limb Observer
                      for Radiance Imaging of the Atmosphere) is a new remote
                      sensing instrument that is able to adjust its horizontal
                      view angle with respect to the aircraft flight direction
                      from 45 degrees to 135 degrees. This will allow for
                      tomographic measurements of mesoscale structures for a wide
                      variety of atmospheric constituents.Many flights of the
                      GLORIA instrument will not follow closed curves that allow
                      measuring an airmass from all directions. Consequently, it
                      is examined by means of simulations, what spatial resolution
                      can be expected under ideal conditions from tomographic
                      evaluation of measurements made during a straight flight. It
                      is demonstrated that the achievable horizontal resolution in
                      the line-of-sight direction could be reduced from over 200
                      km to around 70 km compared to conventional retrievals and
                      that the tomographic retrieval is also more robust against
                      horizontal gradients in retrieved quantities in this
                      direction. In a second step, it is shown that the
                      incorporation of channels exhibiting different optical depth
                      can further enhance the spatial resolution of 3-D retrievals
                      enabling the exploitation of spectral samples usually not
                      used for limb sounding due to their opacity.A second problem
                      for tomographic retrievals is that advection, which can be
                      neglected for conventional retrievals, plays an important
                      role for the time-scales involved in a tomographic
                      measurement flight. This paper presents a method to diagnose
                      the effect of a time-varying atmosphere on a 3-D retrieval
                      and demonstrates an effective way to compensate for effects
                      of advection by incorporating wind-fields from
                      meteorological datasets as a priori information.},
      keywords     = {J (WoSType)},
      cin          = {JSC / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {Scientific Computing (FUEK411) / Atmosphäre und Klima
                      (FUEK491) / 411 - Computational Science and Mathematical
                      Methods (POF2-411)},
      pid          = {G:(DE-Juel1)FUEK411 / G:(DE-Juel1)FUEK491 /
                      G:(DE-HGF)POF2-411},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298135800010},
      doi          = {10.5194/amt-4-2509-2011},
      url          = {https://juser.fz-juelich.de/record/17958},
}