TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 51 (Nos. 7, 8), pp. 571-569, 1999

QBO effects on the diurnal tide in the upper atmosphere

M. E. Hagan1, M. D. Burrage2, J. M. Forbes3, J. Hackney1, W. J. Randel1, and X. Zhang3

1National Center for Atmospheric Research, Boulder, Colorado, U.S.A.
2Space Physics Research Laboratory, University of Michigan, Ann Arbor, U.S.A.
3Department of Aerospace Engineering Sciences, University of Colorado, Boulder, U.S.A.

(Received August 20, 1998; Revised January 25, 1999; Accepted January 25, 1999)

Abstract: We report on a series of numerical experiments conducted with the global-scale wave model (GSWM) and designed to investigate the effects of the quasi-biennial oscillation (QBO) on the migrating diurnal tide. Our results indicate that the diurnal tidal response in the upper mesosphere and lower thermosphere (MLT) is significantly affected by the QBO in zonal mean zonal winds, but largely insensitive to the QBO in stratospheric ozone. We discuss the variable mean wind results in light of previous analytic attempts to describe the diurnal tide in the presence of mean winds and dissipation. Our calculations do not explain the interannual tidal variations observed by the High Resolution Doppler Interferometer (HRDI) on the Upper Atmosphere Research Satellite (UARS).

Corresponding author E-mail: hagan@ucar.edu

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