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@ARTICLE{Griessbach:153901,
      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},
      volume       = {7},
      number       = {5},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2014-03370},
      pages        = {1487 - 1507},
      year         = {2014},
      abstract     = {Small volcanic ash particles have long residence times in
                      the troposphere and the stratosphere so that they have
                      significant 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 and
                      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 in an extensive simulations study 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 upper detectable
                      effective radius of 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)},
      pid          = {G:(DE-HGF)POF2-411},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000336740700021},
      doi          = {10.5194/amt-7-1487-2014},
      url          = {https://juser.fz-juelich.de/record/153901},
}