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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Quantifying gravity wave forcing using scale invariance.

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  • 1High Altitude Observatory, National Center for Atmospheric Research, P.O.Box 3000, Boulder, CO, 80307-3000, USA. liuh@ucar.edu.

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General circulation models struggle with wave forcing uncertainty. This study uses scale invariance to quantify forcing by unresolved waves, revealing small-scale forcing is crucial for accurate climate models.

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Area of Science:

  • Atmospheric Science
  • Climate Modeling
  • Wave Dynamics

Background:

  • General circulation models (GCMs) face challenges in accurately representing wave forcing on mean circulation due to insufficient resolution.
  • Parameterization schemes for sub-grid scale wave forcing introduce significant uncertainty in climate projections.
  • Converging results for resolved wave forcing remain elusive despite advancements in model resolution.

Purpose of the Study:

  • To investigate the scale invariance of zonal spectra for momentum flux and wave forcing.
  • To develop a method for quantifying forcing by unresolved waves using knowledge of resolved waves in global models.
  • To assess the role of wave-mean flow interaction in maintaining spectral structure.

Main Methods:

  • Analysis of scale invariance in zonal spectra of momentum flux and wave forcing.
  • Utilizing resolved wave information to infer forcing by unresolved waves.
  • Comparison with requirements for simulating observed zonal mean wind climatology.

Main Results:

  • Scale invariance is a key property for quantifying wave forcing.
  • Small-scale wave forcing is of leading order importance for GCMs.
  • Wave-mean flow interaction is vital for robust spectral structure maintenance.

Conclusions:

  • A novel method is proposed to quantify unresolved wave forcing using scale invariance.
  • This approach can lead to physically consistent and scale-aware parameterization schemes.
  • Sufficient model resolution to partially resolve spectra is necessary for applying this method.