% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Hoffmann:825096,
      author       = {Hoffmann, Lars and Spang, Reinhold and Orr, Andrew and
                      Alexander, M. Joan and Holt, Laura A. and Stein, Olaf},
      title        = {{A} decadal satellite record of gravity wave activity in
                      the lower stratosphere to study polar stratospheric cloud
                      formation},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-07573},
      pages        = {},
      year         = {2016},
      abstract     = {Atmospheric gravity waves yield substantial small-scale
                      temperature fluctuations that can trigger the formation of
                      polar stratospheric clouds (PSCs). This paper introduces a
                      new satellite record of gravity wave activity in the polar
                      lower stratosphere to investigate this process. The record
                      comprises observations of the Atmospheric InfraRed Sounder
                      (AIRS) aboard NASA's Aqua satellite during January 2003 to
                      December 2012. Gravity wave activity is measured in terms of
                      detrended and noise-corrected 15 μm brightness
                      temperature variances, which are calculated from AIRS
                      channels that are most sensitive to temperature fluctuations
                      at about 17–32 km altitude. The analysis of temporal
                      patterns in the data set revealed a strong seasonal cycle in
                      wave activity with wintertime maxima at mid and high
                      latitudes. The analysis of spatial patterns indicated that
                      orography as well as jet and storm sources are the main
                      cause of the observed waves. Wave activity is closely
                      correlated with 30 hPa zonal winds, which is attributed to
                      the AIRS observational filter. We used the new data set to
                      evaluate explicitly resolved temperature fluctuations due to
                      gravity waves in the European Centre for Medium-Range
                      Weather Forecast (ECMWF) operational analysis. It was found
                      that the analysis reproduces orographic and non-orographic
                      wave patterns in the right places, but that wave amplitudes
                      are typically underestimated by a factor of 2–3.
                      Furthermore, in a first survey of joint AIRS and Michelson
                      Interferometer for Passive Atmospheric Sounding (MIPAS)
                      satellite observations nearly 50 gravity wave-induced PSC
                      formation events were identified. The survey shows that the
                      new AIRS data set can help to better identify such events
                      and more generally highlights the importance of the process
                      for polar ozone chemistry.},
      cin          = {IEK-7 / JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013 / I:(DE-Juel1)JSC-20090406},
      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/acp-2016-757},
      url          = {https://juser.fz-juelich.de/record/825096},
}