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AGU: Geophysical Research Letters

 

Index Terms

  • Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics
  • Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1019, 4 PP., 2002
doi:10.1029/2001GL013762

Tropospheric and equatorial influences on planetary-wave amplitude in the stratosphere

Yongyun Hu

Department of Applied Mathematics, University of Washington, Seattle WA, 98195-2420 USA

Ka Kit Tung

Department of Applied Mathematics, University of Washington, Seattle WA, 98195-2420 USA

Using 49-year NCEP/NCAR reanalysis data we examine two possible factors affecting the amplitudes of extratropical planetary waves in the stratosphere: tropospheric influence and equatorial Quasi-Biennial Oscillation (QBO) modulation. Our results show that the QBO modulation on wave amplitudes is statistically significant only for wavenumber-1 in early winter. The variability of wavenumber-2 amplitude is mainly determined by tropospheric forcing. The effect of the solar cycle on planetary-wave amplitude is also discussed.

Published 23 January 2002.

Citation: Hu, Y., and K. K. Tung (2002), Tropospheric and equatorial influences on planetary-wave amplitude in the stratosphere, Geophys. Res. Lett., 29(2), 1019, doi:10.1029/2001GL013762.

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