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Journal Article

Sensitivity of the quasi-biennial oscillation to CO2 doubling

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Giorgetta,  Marco A.       
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37134

Doege,  Martin C.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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2004GL021971.pdf
(Publisher version), 340KB

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Citation

Giorgetta, M. A., & Doege, M. C. (2005). Sensitivity of the quasi-biennial oscillation to CO2 doubling. Geophysical Research Letters, 32(8): L08701. doi:10.1029/2004GL021971.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-FEFB-2
Abstract
The quasi-biennial oscillation (QBO) is a major oscillation with a characteristic period of 28 months that influences substantially the stratospheric circulation and chemistry. This exploratory study investigates its possible change by direct simulation of the QBO in a doubled CO2 climate for a range of gravity wave sources. It is found that a QBO spin-up is likely. In the most extreme case the period is nearly halved. Important accelerating factors are the decreased tropical upwelling and increased gravity wave drag, while increased filtering of eastward gravity waves in the upper tropical troposphere acts as a decelerating factor.