EXTRA-TROPICAL QBO SIGNALS IN ANGULAR-MOMENTUM AND WAVE FORCING

被引:27
作者
BALDWIN, MP [1 ]
TUNG, KK [1 ]
机构
[1] UNIV WASHINGTON,DEPT APPL MATH,SEATTLE,WA 98195
关键词
D O I
10.1029/94GL02119
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Although the period of the equatorial stratospheric quasi-biennial oscillation (QBO) is approximately 30 months, quasi-biennial modulation of the extratropical annual cycle may be expected to produce additional spectral peaks at approximately 8.6 and 20 months in the extratropics. Using Northern Hemisphere data for 1964-78 and global data for 1978-93 it is shown that these spectral peaks are robust in both angular momentum and Eliassen-Palm flux divergence. This spectral signature represents a circulation anomaly in both hemispheres, and implies a dynamical origin to the previously observed similar spectral peaks in column ozone in the extratropics.
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页码:2717 / 2720
页数:4
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