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@ARTICLE{Hoffmann:155275,
      author       = {Hoffmann, L. and Alexander, M. J. and Clerbaux, C. and
                      Grimsdell, A. W. and Meyer, Catrin and Rößler, T. and
                      Tournier, B.},
      title        = {{I}ntercomparison of stratospheric gravity wave
                      observations with {AIRS} and {IASI}},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {7},
      number       = {8},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2014-04449},
      pages        = {8415 - 8464},
      year         = {2014},
      abstract     = {Gravity waves are an important driver for the atmospheric
                      circulation and have substantial impact on weather and
                      climate. Satellite instruments offer excellent opportunities
                      to study gravity waves on a global scale. This study focuses
                      on observations from the Atmospheric Infrared Sounder (AIRS)
                      onboard the National Aeronautics and Space Administration's
                      Aqua satellite and the Infrared Atmospheric Sounding
                      Interferometer (IASI) onboard the European MetOp satellites.
                      The main aim of this study is an intercomparison of
                      stratospheric gravity wave observations of both instruments.
                      In particular, we analyzed AIRS and IASI 4.3 μm brightness
                      temperature measurements, which directly relate to
                      stratospheric temperature. Three case studies showed that
                      AIRS and IASI provide a clear and consistent picture of the
                      temporal development of individual gravity wave events.
                      Statistical comparisons based on a five-year period of
                      measurements (2008–2012) showed similar spatial and
                      temporal patterns of gravity wave activity. However, the
                      statistical comparisons also revealed systematic differences
                      of variances between AIRS and IASI (about $45\%)$ that we
                      attribute to the different spatial measurement
                      characteristics of both instruments. We also found
                      differences between day- and nighttime data (about $30\%)$
                      that are partly due to the local time variations of the
                      gravity wave sources. While AIRS has been used successfully
                      in many previous gravity wave studies, IASI data are applied
                      here for the first time for that purpose. Our study shows
                      that gravity wave observations from different hyperspectral
                      infrared sounders such as AIRS and IASI can be directly
                      related to each other, if instrument-specific
                      characteristics such as different noise levels and spatial
                      resolution and sampling are carefully considered. The
                      ability to combine observations from different satellites
                      provides an opportunity to create a long-term record, which
                      is an exciting prospect for future climatological studies of
                      stratospheric gravity wave activity.},
      cin          = {JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {411 - Computational Science and Mathematical Methods
                      (POF2-411)},
      pid          = {G:(DE-HGF)POF2-411},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/amtd-7-8415-2014},
      url          = {https://juser.fz-juelich.de/record/155275},
}