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@INPROCEEDINGS{Noble:1042586,
      author       = {Noble, Phoebe and Okui, Haruka and Alexander, Joan and Ern,
                      Manfred and Hindley, Neil and Hoffmann, Lars and Holt, Laura
                      and van Niekerk, Annelize and Plougonven, Riwal and
                      Polichtchouk, Inna and Stephan, Claudia and Bramberger,
                      Martina and Corcos, Milena and Wright, Corwin},
      title        = {{S}tratospheric {G}ravity waves in {AIRS} observations and
                      high-resolution models},
      reportid     = {FZJ-2025-02582},
      year         = {2025},
      abstract     = {Atmospheric gravity waves vary hugely in scale; with
                      horizontal wavelengths ranging from a few to thousands of
                      km. Typically, gravity waves are smaller than model
                      grid-size and as a result, their effects are parametrised
                      instead of being explicitly resolved. However, recent
                      computational and scientific advancements have allowed for
                      the development of higher resolution global-scale models.
                      These models have horizontal resolutions of order a few km
                      with around 1km vertical resolution in the stratosphere. At
                      such scales, it should in principle be possible to
                      accurately simulate the majority of GWs without relying on
                      parametrisation.In this work, we use data from three models
                      from the DYAMOND Initiative (DYnamics of the Atmospheric
                      general circulation Modeled On Non-hydrostatic Domains).
                      Specifically, IFS (Integrated Forecast System – produced
                      by ECMWF) at 4km horizontal resolution, ICON (Icosahedral
                      NonHydrostatic) at 5km horizontal resolution and GEOS
                      (Goddard Earth Observing System model) at 3km horizontal
                      resolution. All models are initialised with the same initial
                      conditions and are free running for 40 days. We then compare
                      the properties of resolved gravity waves with observations
                      from the AIRS instrument (Atmospheric InfraRed Sounder)
                      onboard NASA’s Aqua satellite. Importantly, we note that
                      the AIRS observations are limited by the ‘observational
                      filter’, wherein each observing system can only `see' a
                      limited portion of the full GW spectrum. To account for
                      this, an important step in this work is in resampling the
                      model atmospheres as though viewed by the AIRS instrument.We
                      compare the representation of resolved waves in the three
                      models and AIRS observations across 40-days in Austral
                      winter. We use a recently developed machine learning wave
                      identification method to separate gravity waves in the
                      dataset and determine gravity wave occurrence frequencies.
                      Next, we use spectral analysis to estimate gravity wave
                      amplitudes, wavelengths and calculate momentum fluxes and
                      the intermittency of gravity waves. This work provides an
                      essential evaluation of the accuracy of current gravity wave
                      modelling capabilities.},
      month         = {Apr},
      date          = {2025-04-27},
      organization  = {EGU General Assembly 2025, Vienna
                       (Austria), 27 Apr 2025 - 2 May 2025},
      subtyp        = {Other},
      cin          = {ICE-4 / JSC},
      cid          = {I:(DE-Juel1)ICE-4-20101013 / 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)6},
      url          = {https://juser.fz-juelich.de/record/1042586},
}