Normal modes as simulated in a three-dimensional circulation model of the middle atmosphere including regional gravity wave activity

Details Normal modes as simulated in a three-dimensional circulation model of the middle atmosphere including regional gravity wave activity Normal modes as simulated in a three-dimensional circulation model of the middle atmosphere including regional gravity wave activity

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..103j&link_type=abstract

(European Geophysical Society, Symposium on Middle Atmosphere and Chemistry, 11th, Kiel, West Germany, June 21-30, 1987) Annales

Physics

1

Atmospheric Circulation, Atmospheric Models, Gravity Waves, Middle Atmosphere, Three Dimensional Models, Bandpass Filters, Mesopause, Modal Response, Power Spectra, Time Series Analysis

Scientific paper

Investigations of gravity wave effects are made in a 3-dimensional circulation model of the middle atmosphere extending from 10 to 150 km altitude. The main effect of regional gravity wave sources is the in situ generation of large-scale perturbations in the mesopause region. A space-time spectral analysis together with a bandpass filtering method show that most of the longer period disturbances approximately exhibit normal mode characteristics. The long period spectral range identifies westward traveling waves with periods of 30 h, 40 h, 2 d, 4 d, and 8 d and an eastward traveling equatorial Kelvin wave with a period of nearly 3 d. The horizontal and vertical structure of the former simulated disturbances in the model are in close agreement with observations and theory of atmospheric normal modes, while the latter corresponds to the equatorial mesospheric Kelvin wave.

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