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@ARTICLE{Berthelemy:1048842,
      author       = {Berthelemy, Peter G. and Wright, Corwin J. and Hindley,
                      Neil P. and Noble, Phoebe E. and Hoffmann, Lars},
      title        = {{A} novel identification method for stratospheric gravity
                      waves in nadir viewing satellite observations},
      journal      = {Atmospheric chemistry and physics},
      volume       = {25},
      number       = {23},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2025-04947},
      pages        = {17595 - 17611},
      year         = {2025},
      abstract     = {Atmospheric gravity waves (GWs) are an important mechanism
                      for vertical transport of energy and momentum through the
                      atmosphere. Their impacts are apparent at all scales,
                      including aviation, weather, and climate. Identifying
                      stratospheric GWs from satellite observations is challenging
                      due to instrument noise and effects of weather processes,
                      but they can be observed from nadir sounders such as the
                      AIRS instrument onboard Aqua. Here, a new method (hereafter
                      “neighbourhood method”) to detect GW information is
                      presented and applied to AIRS data. This uses a variant of
                      the 3D S-transform to calculate the horizontal wavenumbers
                      of temperature perturbations, then find areas of spatially
                      constant horizontal wavenumbers (assumed to be GWs), which
                      allow for creating a binary wave-presence mask. We describe
                      the concept of the neighbourhood method and use it to
                      investigate GW amplitudes, zonal pseudomomentum fluxes, and
                      vertical wavelengths over 5 years of AIRS data. We compare
                      these results to those calculated from GWs detected using
                      another widely used method based on an amplitude cutoff.
                      $35 \%$ of regions of wave activity detected using the
                      neighbourhood method have amplitudes lower than is visible
                      using the amplitude cutoff method. Three regions are studied
                      in greater depth: the Rocky Mountains, North Africa, and New
                      Zealand/Tasmania. GWs detected using the neighbourhood
                      method have wave phase propagation angles consistent with
                      linear theory. Using the neighbourhood method produces new
                      statistics for regional and global GW studies, which compare
                      favourably to the amplitude cutoff GW detection method.},
      cin          = {JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-25-17595-2025},
      url          = {https://juser.fz-juelich.de/record/1048842},
}