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@ARTICLE{Offermann:17425,
      author       = {Offermann, D. and Wintel, J. and Kalicinsky, C. and
                      Knieling, P. and Koppmann, R. and Steinbrecht, W.},
      title        = {{L}ong term development of short period gravity waves in
                      {M}iddle {E}urope},
      journal      = {Journal of Geophysical Research},
      volume       = {116},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-17425},
      pages        = {D00P07},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The long-term development of short-period gravity waves is
                      investigated using the analysis of temperature fluctuations
                      in the mesosphere. The temperature fluctuations are
                      quantified by their standard deviations sigma based on data
                      from OH measurements at Wuppertal (51 degrees N, 7 degrees
                      E) and Hohenpeissenberg (48 degrees N, 11 degrees E)
                      obtained from 1994 to 2009 at 87 km altitude. The
                      temperatures are Fourier analyzed in the spectral regime of
                      periods between 3 and 10 min. The resulting oscillation
                      amplitudes correlate very well with the standard deviations.
                      Shortest periods are taken as "ripples" that are indicative
                      of atmospheric instabilities/breaking gravity waves. In
                      consequence the standard deviations are used as proxies for
                      gravity wave activity and dissipation. This data set is
                      analyzed for seasonal, intradecadal, and interdecadal
                      (trend) variations. Seasonal changes show a double peak
                      structure with maxima occurring slightly before circulation
                      turnaround in spring and autumn. This is found to be in
                      close agreement with seasonal variations of turbulent eddy
                      coefficients obtained from WACCM 3.5. The intradecadal
                      variations show close correlations with the zonal wind and
                      the annual amplitude of the mesopause temperature. The
                      long-term trend (16 years) indicates an increase of gravity
                      wave activity of $1.5\%$ per year. Correspondences with
                      dynamical parameters such as zonal wind speed and summer
                      length are discussed.},
      keywords     = {J (WoSType)},
      cin          = {IEK-7 / IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013 / I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000293091600002},
      doi          = {10.1029/2010JD015544},
      url          = {https://juser.fz-juelich.de/record/17425},
}