Abstract
The association of seasonal timing of stratospheric final warming events (SFWs) in spring and the occurrence of major and minor stratospheric sudden warming events (SSWs) in midwinter were investigated through statistical analysis, parallel comparison, and composite analysis, based on the NCEP-NCAR reanalysis dataset covering 1958–2012. It was found that the intensity and occurrence of winter SSW events can largely affect the timing of spring SFWs. Specifically, the SFW onset dates tend to be later (earlier) after the occurrence (absence) of winter major SSWs. However, the occurrence or absence of minor SSWs does not change the frequency of early and late SFWs. A parallel comparison of the temporal evolution of the anomalous circulation and planetary-waves between major SSW and minor SSW winters indicates that the stratospheric polar vortex (polar jet) will keep being anomalously stronger 30 days after major SSW onset. And the associated significant negative Eliassen-Palm (EP) flux anomalies can persist for as long as 45 days after major SSW events. In contrast, the circulation anomalies around the occurrence of minor SSW events can last only a few days. To further verify the possible influence of the occurrence of major SSWs on the seasonal timing of SFWs, composite analysis was performed respectively for the 21 major-SSW years, 15 minor-SSW years, and the 15 non-SSW years. Generally, planetary-wave activity in the extratropical stratosphere tends to be stronger (weaker) and the westerly polar jet is anomalously weaker (stronger) in major-SSW (non-SSW) winters. But in the following spring, the planetary-wave activity is weaker (stronger) accompanied with an anomalously stronger (weaker) stratospheric polar vortex. In spring after minor-SSW years, however, the stratospheric polar vortex and the westerly polar jet exhibit a state close to climatology with relatively gentle variations.
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Hu, J., Ren, R., Xu, H. et al. Seasonal timing of stratospheric final warming associated with the intensity of stratospheric sudden warming in preceding winter. Sci. China Earth Sci. 58, 615–627 (2015). https://doi.org/10.1007/s11430-014-5008-z
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DOI: https://doi.org/10.1007/s11430-014-5008-z