Theory and observations of the short-period normal mode oscillations of the atmosphere

Details Theory and observations of the short-period normal mode oscillations of the atmosphere Theory and observations of the short-period normal mode oscillations of the atmosphere

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111867h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 20, 1986, p. 11867-11875. NSERC-supported research.

Physics

34

Annual Variations, Atmospheric Turbulence, High Frequencies, Planetary Waves, Vibration Mode, Gravity Waves, Kelvin-Helmholtz Instability, Mars Atmosphere

Scientific paper

Virtually all previous work on the subject of atmospheric normal modes has concentrated on the relatively long-period Rossby modes, such as the familiar '5-day' and '16-day' waves. However, theory does predict the existence of shorter-period Rossby-gravity, Kelvin, and gravity modes. In the present investigation, long time series of hourly and 3-hourly barometric observations from several tropical stations were employed in a search for these high-frequency modes. Evidence was found for several spectral peaks that can be identified with various Rossby-gravity, Kelvin, and gravity wave normal modes. Particularly prominent is the zonal wave number 1 Kelvin normal mode with a period of about 33 hours. This mode was found to undergo systematic seasonal and interannual variations. The theory of short-period normal modes in the Martian atmosphere is also briefly examined. Such modes might be detectable in the surface pressure time series obtained inthe Viking missions to Mars.

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