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@ARTICLE{Prochzkov:1006588,
      author       = {Procházková, Zuzana and Kruse, Christopher G. and
                      Alexander, M. Joan and Hoffmann, Lars and Bacmeister, Julio
                      T. and Holt, Laura and Wright, Corwin and Sato, Kaoru and
                      Gisinger, Sonja and Ern, Manfred and Geldenhuys, Markus and
                      Preusse, Peter and Šácha, Petr},
      title        = {{S}ensitivity of mountain wave drag estimates on separation
                      methods and proposed improvements},
      journal      = {Journal of the atmospheric sciences},
      volume       = {80},
      number       = {7},
      issn         = {0022-4928},
      address      = {Boston, Mass.},
      publisher    = {American Meteorological Soc.},
      reportid     = {FZJ-2023-01729},
      pages        = {1661–1680},
      year         = {2023},
      abstract     = {Internal gravity waves (GWs) are ubiquitous in the
                      atmosphere, making significant contributions to the
                      mesoscale motions. Since the majority of their spectrum is
                      unresolved in global circulation models, their effects need
                      to be parameterized. In recent decades GWs have been
                      increasingly studied in high-resolution simulations, which,
                      unlike direct observations, allow us to explore full
                      spatiotemporal variations of the resolved wave field. In our
                      study we analyze and refine a traditional method for GW
                      analysis in a high-resolution simulation on a regional
                      domain around the Drake Passage. We show that GW momentum
                      drag estimates based on the Gaussian high-pass filter method
                      applied to separate GW perturbations from the background are
                      sensitive to the choice of a cutoff parameter. The impact of
                      the cutoff parameter is higher for horizontal fluxes of
                      horizontal momentum, which indicates higher sensitivity for
                      horizontally propagating waves. Two modified methods, which
                      choose the parameter value from spectral information, are
                      proposed. The dynamically determined cutoff is mostly higher
                      than the traditional cutoff values around 500 km, leading to
                      larger GW fluxes and drag, and varies with time and
                      altitude. The differences between the traditional and the
                      modified methods are especially pronounced during events
                      with significant drag contributions from horizontal momentum
                      fluxes},
      cin          = {IEK-7 / JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013 / I:(DE-Juel1)JSC-20090406},
      pnm          = {2112 - Climate Feedbacks (POF4-211) / 5111 -
                      Domain-Specific Simulation $\&$ Data Life Cycle Labs (SDLs)
                      and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-2112 / G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001022833400001},
      doi          = {10.1175/JAS-D-22-0151.1},
      url          = {https://juser.fz-juelich.de/record/1006588},
}