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Izvestiya, Atmospheric and Oceanic Physics

, Volume 55, Issue 1, pp 32–37 | Cite as

Estimation of the Contribution of Different Mechanisms to the Phase Evolution of Quasi-Biennial Oscillation Using the Results of Climate Simulation

  • E. M. VolodinEmail author
Article

Abstract

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.

Keywords:

oscillation spectrum energy phase Fourier transform 

Notes

ACKNOWLEDGMENTS

The development of the technique of analyzing the contribution to the phase change was supported by the Russian Science Foundation, grant no. 17-17-01295. The analysis of the contribution of different terms to the evolution of the quasi-biennial oscillation phase was supported by the Russian Science Foundation, grant no. 14-27-00126.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Institute of Numerical Mathematics, Russian Academy of SciencesMoscowRussia

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