Comparison between non orographic gravity wave parameterizations used in QBOi models and Strateole 2 constant level balloons - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Quarterly Journal of the Royal Meteorological Society Année : 2024

Comparison between non orographic gravity wave parameterizations used in QBOi models and Strateole 2 constant level balloons

H.-K. Lee
  • Fonction : Auteur
H.-Y. Chun
  • Fonction : Auteur
Y. Kawatani
  • Fonction : Auteur
F. Serva
  • Fonction : Auteur
T. Stockdale
  • Fonction : Auteur
S. Versick
  • Fonction : Auteur
S. Watanabe
  • Fonction : Auteur

Résumé

Gravity Wave (GW) parameterizations from 12 General Circulation Models (GCMs) participating in the Quasi-Biennial Oscillation initiative (QBOi) are compared to Strateole-2 balloon observations made in the tropical lower stratosphere from November 2019 to February 2020 (phase 1) and from October 2021 to January 2022 (phase 2). The parameterizations employ the 3 standard techniques used in GCMs to represent subgrid scale non-orographic GWs, namely the two globally spectral techniques developed by Warner and McIntyre (1999) and Hines {1997), as well as the "multiwaves" approaches following Lindzen (1981). The input meteorological fields necessary to run the parameterizations offline are extracted from the ERA5 reanalysis and correspond to the meteorological conditions found underneath the balloons. In general, there is fair agreement between amplitudes derived from measurements for the waves with periods less than $1~$hr and the parameterizations. The correlation between the daily observations and the corresponding results of the parameterization can be around $0.4$, which is $99\%$ significant since 1200 days of observations are used. Given that the parameterizations have only been tuned to produce a QBO in the models, the $0.4$ correlation coefficient of the GW momentum fluxes is surprisingly good. These correlations nevertheless vary between schemes and depend little on their formulation (globally spectral versus multiwaves for instance). We therefore attribute these correlations to dynamical filtering, which all schemes take into account, whereas only a few relate the gravity waves to their sources. Statistically significant correlations are mostly found for eastward propagating waves, which may be due to the fact that during both Strateole 2 phases the QBO is easterly at the altitude of the balloon flights. We also found that the probability density functions (pdfs) of the momentum fluxes are better represented in spectral schemes with constant sources than in schemes ("spectral" or "multiwaves") that relate GWs to their convective sources.
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Dates et versions

hal-04615892 , version 1 (18-06-2024)

Identifiants

  • HAL Id : hal-04615892 , version 1

Citer

François Lott, R. Rani, C. Mclandress, A. Podglajen, A. Bushell, et al.. Comparison between non orographic gravity wave parameterizations used in QBOi models and Strateole 2 constant level balloons. Quarterly Journal of the Royal Meteorological Society, inPress. ⟨hal-04615892⟩
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