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Seasonal aspects of the quasi-biennial oscillation in the Max Planck Institute Earth System Model and ERA-40

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Krismer,  Thomas
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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

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Esch,  Monika
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Krismer, T., Giorgetta, M. A., & Esch, M. (2013). Seasonal aspects of the quasi-biennial oscillation in the Max Planck Institute Earth System Model and ERA-40. Journal of Advances in Modeling Earth Systems, 5, 406-421. doi:10.1002/jame.20024.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-1863-0
Abstract
This study investigates seasonal modulations of the quasi-biennial oscillation (QBO) of the tropical stratosphere. For this purpose, the Max Planck Institute Earth System Model (MPI-ESM), which internally generates a realistic QBO compared to the ERA-40 data set, is employed. The modeled QBO is forced with resolved and parametrized waves. At 5 hPa, the seasonal distribution of the onset of QBO westerly jets clusters in spring and fall due to the coupling of the QBO and the semiannual oscillation. This seasonal clustering of the westerly jets extends throughout the stratosphere, shifting to later months with increasing pressure. QBO westerly jets starting in the upper stratosphere in fall propagate to the middle stratosphere more slowly than westerly jets starting in spring. This is attributed to seasonal modulations of the QBO forcing and enhanced wave filtering by the QBO westerly jet in the lower stratosphere in fall and winter compared to spring and summer. The observed stalling of the QBO easterly jet in the lower stratosphere and the accompanied prolonged persistence of the QBO westerly jet in the vicinity of the tropopause are attributed equally to seasonal variations of the resolved and parameterized wave forcing and the advective forcing.