Planetary Scale Inertio Gravity Waves in the Mesosphere

Details Planetary Scale Inertio Gravity Waves in the Mesosphere Planetary Scale Inertio Gravity Waves in the Mesosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa51a0499p&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA51A-0499

Physics

3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3337 Numerical Modeling And Data Assimilation, 3367 Theoretical Modeling, 3384 Waves And Tides

Scientific paper

In the polar region of the upper mesosphere, horizontal wind oscillations have been observed with periods around 10 hours. Waves with such periodicity are generated in our Numerical Spectral Model (NSM), and they are identified as planetary scale inertio gravity waves (IGW). In addition to stationary waves for zonal wavenumber m = 0, eastward and westward propagating waves for m = 1 to 4 appear above 70 km, which grow in magnitude up to about 100 km and have periods between 9 and 11 hours. The m = 1 westward propagating IGWs have the largest amplitudes, which can reach at the poles 30 m/s. The IGWs are intermittent but reveal systematic seasonal variations, with the largest amplitudes occurring generally in winter and spring. The IGWs propagate upward with a vertical wavelength of about 25 km. Without the migrating tidal excitation sources, the IGWs are different but still appear with comparable amplitudes. Like the planetary waves (PW) in the model, the IGWs are apparently produced by instabilities that arise in the mean zonal circulation. When the solar heating for m = 0 is turned off, the IGWs, and PWs, essentially disappear.

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