Modeling the quasi-biennial oscillation of atmospheric temperature and the tendencies of its evolution under climatic changes

The quasi-biennial oscillation (QBO) of atmospheric temperature and the tendencies of its evolution are analyzed in the context of a three-dimensional climate model developed by the Institute of Atmospheric Physics, Russian Academy of Sciences (IFA RAS). An analytic study of the equations of heat content in tropospheric and stratospheric integral layers has shown that the temperature QBO can be generated through the mechanism of parametric resonance in the atmosphere. In this case, the characteristics of the QBO depend heavily on stratospheric parameters. Under the present-day climatic conditions, the QBO of atmospheric temperature manifests itself mainly over continents. With a doubled content of atmospheric carbon dioxide, the temperature QBO disappears for most regions. These tendencies are in qualitative agreement with empirical tropospheric data.