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@ARTICLE{Griessbach:139374,
      author       = {Griessbach, Sabine and Hoffmann, L. and Spang, R. and
                      Riese, M.},
      title        = {{V}olcanic ash detection with infrared limb sounding:
                      {MIPAS} observations and radiative transfer simulations},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {6},
      number       = {6},
      issn         = {1867-8610},
      reportid     = {FZJ-2013-05370},
      pages        = {9939 - 9991},
      year         = {2013},
      abstract     = {Small volcanic ash particles have long residence times in
                      troposphere and stratosphere so that they have impact on the
                      Earth's radiative budget and consequently affect climate.
                      For global long term observations of volcanic aerosol,
                      infrared limb measurements provide excellent coverage,
                      sensitivity to thin aerosol layers, and altitude
                      information. The optical properties of volcanic ash and ice
                      particles, derived from micro-physical properties, have
                      opposing spectral gradients between 700 to 960 cm−1 for
                      small particle sizes. Radiative transfer simulations that
                      account for single scattering showed that the opposing
                      spectral gradients directly transfer to infrared limb
                      spectra. Indeed, we found the characteristic spectral
                      signature, expected for volcanic ash, in measurements of the
                      Michelson Interferometer for Passive Atmospheric Sounding
                      (MIPAS) after the eruption of the Chilean volcano
                      Puyehue-Cordón Caulle in June 2011. From these measurements
                      we derived an ash detection threshold function. The
                      empirical ash detection threshold was confirmed by
                      simulations covering a wide range of atmospheric conditions,
                      particle sizes, and particle concentrations for ice,
                      volcanic ash, and sulfate aerosol. From the simulations we
                      derived the detectable effective radius range of 0.2 to 3.5
                      μm and the detectable extinction coefficient range of 5 ×
                      10−3 to 1 × 10−1 km−1. We also showed that this
                      method is only sensitive to volcanic ash particles, but not
                      to volcanic sulfate aerosol. This volcanic ash detection
                      method for infrared limb measurements is a fast and reliable
                      method and provides complementary information to existing
                      satellite aerosol products.},
      cin          = {JSC / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {411 - Computational Science and Mathematical Methods
                      (POF2-411) / 234 - Composition and Dynamics of the Upper
                      Troposphere and Stratosphere (POF2-234)},
      pid          = {G:(DE-HGF)POF2-411 / G:(DE-HGF)POF2-234},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/amtd-6-9939-2013},
      url          = {https://juser.fz-juelich.de/record/139374},
}