Estimation of the Contribution of Different Mechanisms to the Phase Evolution of Quasi-Biennial Oscillation Using the Results of Climate Simulation
- Autores: Volodin E.1
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Afiliações:
- Institute of Numerical Mathematics, Russian Academy of Sciences
- Edição: Volume 55, Nº 1 (2019)
- Páginas: 32-37
- Seção: Article
- URL: https://journals.rcsi.science/0001-4338/article/view/148691
- DOI: https://doi.org/10.1134/S0001433819010110
- ID: 148691
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Resumo
For the evolution equation, a technique is proposed to estimate the contribution of different terms to a phase change during oscillations of different frequencies. The contribution is normalized such that a sum of contributions from all terms amounts to 1. This technique is applied to studying the quasi-biennial oscillation of the wind velocity in the equatorial stratosphere, which is retrieved from data of the 500-year preindustrial experiment using the climate model of the Institute of Numerical Mathematics of the Russian Academy of Sciences. The impacts of the nonorographic and orographic gravity-wave drags, as well as of the advection by a zonally averaged velocity, on the phase change of the model quasi-biennial oscillation are calculated. It is shown that the nonorographic wave drag is the main mechanism responsible for the phase change (impact is 1.58); the vertical advection slows down the phase change (impact is –0.74), while impacts of other terms are small.
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Sobre autores
E. Volodin
Institute of Numerical Mathematics, Russian Academy of Sciences
Autor responsável pela correspondência
Email: volodinev@gmail.com
Rússia, Moscow, 119333