Numerical investigation of the propagation of the quasi-two-day wave into the lower thermosphere

Details Numerical investigation of the propagation of the quasi-two-day wave into the lower thermosphere Numerical investigation of the propagation of the quasi-two-day wave into the lower thermosphere

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9823193h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. D12, p. 23,193-23,205

Physics

91

Atmospheric Models, Gravity Waves, Middle Atmosphere, Periodic Variations, Planetary Waves, Thermosphere, Wave Propagation, Altitude, Energy Dissipation, Geostrophic Wind, Jet Streams (Meteorology), Latitude, Linearization, Resonant Frequencies, Summer, Winter, Zonal Flow (Meteorology)

Scientific paper

We present results of a series of numerical experiments for January conditions using a linearized spectral model which includes realistic mean winds and dissipation. These experiments were designed to characterize the propagation characteristics of the (3, 0) mixed Rossby-gravity mode through the middle atmosphere and into the lower thermosphere. Our results suggest that the wave magnitude is extremely sensitive to the zonal mean winds assumed in the calculations. In particular, our results suggest that a comparatively weak eastward stratomesospheric jet during northern hemisphere winter can account for a shift in the resonant frequency of the quasi-two-day wave response. Further, the inclusion of a realistic lower thermospheric jet in the summer lower thermosphere sets up a reflecting layer and an associated enhancement of the summer mesospheric wave signature. These features are in keeping with meteor and partial reflection drift radar observations.

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