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Planetary waves modulated by the quasi-biennial oscillation (QBO)

Abstract : A qualitative analysis of the initial zonal conditions in terms of quasi-geostrophic refractive index can provide a fairly good understanding of the effect of the equatorial QBO in the stratosphere before a sudden warming. The prewarming evolution of the stratosphere has been simulated with a global 3-D numerical model in which several patterns of stratospheric equatorial winds have been injected. For each case of QBO, two different runs were performed with wavenumber 1 tropospheric perturbations of 200 and 300 gpm of the geopotential heights at 60 deg N at the lower level and referred to as F200 and F300, respectively. Special emphasis was given to such pre-warming conditions as the effect of the QBO on the quasi-geostrophic refractive index and the consequences for the propagation of planetary waves. The results of the sumulations were compared with those of previous experimental and theoretical research.
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Submitted on : Wednesday, February 3, 2021 - 4:36:42 PM
Last modification on : Friday, February 5, 2021 - 3:14:39 AM

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  • HAL Id : insu-03130560, version 1

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Alexandre Maillard, Alain Hauchecorne, Klaus Rose. Planetary waves modulated by the quasi-biennial oscillation (QBO). Annales Geophysicae, European Geosciences Union, 1990, 8, pp.531-540. ⟨insu-03130560⟩

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