2013 Fiscal Year Final Research Report
Modulation and dynamics of the Quasi-Biennial Oscillation associated with El Nino/Southern Oscillation
| Project/Area Number |
23740353
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Aichi University of Education |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2012
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| Keywords | 準二年周期振動 / 季節同期 / エルニーニョ・南方振動 / 成層圏突然昇温 |
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| Research Abstract |
Using atmospheric reanalysis and CMIP5 datasets, this study investigated modulation and dynamics of the Quasi-Biennial Oscillation (QBO) in the equatorial stratosphere. In particular, we found that in the reanalysis data, the QBO modulation associated with the mean seasonal cycle and El Nino/Southern Oscillation (ENSO) is not explained by large-scale fields. It was also found that QBO-like oscillations, simulated in a few CMIP5 models, have notable differences in structure and behavior from the real world. These suggest that small-scale waves (gravity waves) are important in the modulation.
We further revealed nonlinear changes in frequency of major stratospheric sudden warmings with QBO and ENSO using a long reanalysis dataset.
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