The Influence of the Solar Cycle and QBO on the Late-Winter Stratospheric Polar Vortex

Journal of the Atmospheric Sciences | April 1, 2007| | Copyright

ABSTRACT

A statistical analysis of 51 years of NCEP-NCAR reanalysis data is conducted to isolate the separate effects of the 11-yr solar cycle (SC) and the equatorial quasi-biennial oscillation (QBO) on the Northern Hemisphere (NH) stratosphere in late winter (February-March). In a four-group [SC maximum (SC-max) versus minimum (SC-min) and east-phase versus west-phase QBO] linear discriminant analysis, the state of the westerly phase QBO (wQBO) during SC-min emerges as a distinct least-perturbed (and coldest) state of the stratospheric polar vortex, statistically well separated from the ...

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