Middle atmosphere dynamics with gravity wave interactions in the numerical spectral model: Tides and planetary waves

  • Mayr H
  • Mengel J
  • Chan K
 et al. 
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As Lindzen (1981) had shown, small-scale gravity waves (GW) produce the observed reversals of the zonal-mean circulation and temperature variations in the upper mesosphere. The waves also play a major role in modulating and amplifying the diurnal tides (DT) (e.g., Waltersheid, 1981; Fritts and Vincent, 1987; Fritts, 1995a). We summarize here the modeling studies with the mechanistic numerical spectral model (NSM) with Doppler spread parameterization for GW (Hines, 1997a, b), which describes in the middle atmosphere: (a) migrating and non-migrating DT, (b) planetary waves (PW), and (c) 10-h global-scale inertio gravity waves. Numerical experiments are discussed, which illuminate the influence of GW filtering and nonlinear interactions between DT, PW, and zonal mean variations. © 2011.

Author-supplied keywords

  • Global-scale inertio gravity waves
  • Gravity wave interactions
  • Middle atmosphere dynamics
  • Migrating and non-migrating tides
  • Planetary waves
  • Theoretical modeling

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