Low-frequency inertia-gravity waves in the stratosphere revealed by three-week continuous observation with the MU radar

Details Low-frequency inertia-gravity waves in the stratosphere revealed by three-week continuous observation with the MU radar Low-frequency inertia-gravity waves in the stratosphere revealed by three-week continuous observation with the MU radar

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1739s&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 14, p. 1739-1742

Physics

18

Meteorology And Atmospheric Dynamics, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Instruments And Techniques

Scientific paper

Continuous observations over three weeks were performed with the MU radar at Shigaraki, Japan (35N, 136E) in April of 1995. By integrating radar echo spectra over 30 min after removing severe interferences, winds were successfully estimated offline up to 24 km in the lower stratosphere. It was found that inertia-gravity waves with a period of about 20 h and a vertical wavelength of 3.5 km are dominant near 22 km in a region of weak background winds. Four wave packets were fitted to plane waves by a least-squares method and wave parameters were estimated theoretically. The inertia-gravity waves propagate energy upward, and their horizontal phase velocity is westward in the range -10 to -20ms-1. The waves have large momentum fluxes of about -0.002Nm-2. This result suggests that inertia-gravity wave drag may contribute to the formation of easterlies in the summer stratosphere.

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