Influence of the Quasi-Biennial Oscillation on the Extratropical Winter Stratosphere in an Atmospheric General Circulation Model and in Reanalysis Data
作者： James A. Anstey , Theodore G. Shepherd , John F. Scinocca
关键词: Climatology 、 Quasi-biennial oscillation 、 Stratosphere 、 Polar vortex 、 Extratropical cyclone 、 Empirical orthogonal functions 、 Environmental science 、 Atmospheric sciences 、 General Circulation Model 、 Polar
摘要: Abstract The interannual variability of the stratospheric polar vortex during winter in both hemispheres is observed to correlate strongly with phase quasi-biennial oscillation (QBO) tropical winds. It follows that lack a spontaneously generated QBO most atmospheric general circulation models (AGCMs) adversely affects nature such models. This study examines QBO–vortex coupling an AGCM which induced by resolved and parameterized waves. compares favorably seen reanalysis data [from 40-yr ECMWF Re-Analysis (ERA-40)], provided careful attention given definition phase. A angle representation employed based on two leading empirical orthogonal functions equatorial zonal wind vertical profiles. yields serves as proxy for structure winds over whole depth the...
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