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@PHDTHESIS{Strube:892616,
      author       = {Strube, Cornelia},
      title        = {{G}ravity waves resolved in {N}umerical {W}eather
                      {P}rediction products},
      volume       = {549},
      school       = {Universität Wuppertal},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-02205},
      isbn         = {978-3-95806-567-3},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {iii, 139 S.},
      year         = {2021},
      note         = {Universität Wuppertal, Diss., 2021},
      abstract     = {Gravity waves are important drivers of global circulations
                      in the middle atmosphere. Amongst others they exert drag on
                      the background wind while breaking. Predictive atmospheric
                      simulations are usually based on general circulation models.
                      Those struggle to realistically represent small-scale
                      dynamics like gravity waves, because long time frames and
                      necessary computational efficiency restrict climate model
                      setups to coarse spatial resolutions. Therefore,
                      parametrisations are usually part of forecast model setups
                      of the atmosphere. Parametrisations refer to simplified
                      physical models for subgrid-scale processes including
                      gravity waves. Model studies have shown for instance that
                      missing gravity wave drag influences the global circulation
                      and leads to a systematically late breakdown of the
                      southern-hemispheric polar vortex. In contrast to climate
                      models, weather prediction systems have recently reached
                      operational spatial resolutions that are able to resolve a
                      large part of the gravity wave spectrum in the middle
                      atmosphere. Their products, hence, can be used to
                      investigate the generation and distribution of gravity waves
                      in critical regions like the southern polar vortex region
                      and improve future parametrisation schemes for climate
                      models. This thesis introduces an analysis concept for wave
                      characteristics and the propagation of resolved gravity
                      waves in operational fields from the European Centre for
                      Medium-Range Weather Prediction “Integrated Forecast
                      System” (IFS). The analysis of gravity waves in model data
                      as well as observations is complicated by the abundance of
                      different dynamic processes present in the atmosphere at the
                      same time. Characteristic patterns of inertial instabilities
                      and other wave-like phenomena have been misinterpreted as
                      gravity waves before. Therefore, this thesis focusses first
                      on the ability of different approaches to separate gravity
                      wave signals from the rest of the atmosphere. These methods
                      are referred to as “background removal” and are usually
                      based on the distinction of small- and large-scale phenomena
                      by spectral filtering along different spatial dimensions.
                      The comparison of a vertical and a horizontal filtering
                      approach showed that inertial instability structures are
                      easier separated from gravity waves by applying the
                      horizontal filtering.},
      cin          = {IEK-7},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {211 - Die Atmosphäre im globalen Wandel (POF4-211)},
      pid          = {G:(DE-HGF)POF4-211},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/892616},
}