Dominant vertical scales of gravity waves in the middle atmosphere observed with the MU radar and rocketsondes

Details Dominant vertical scales of gravity waves in the middle atmosphere observed with the MU radar and rocketsondes Dominant vertical scales of gravity waves in the middle atmosphere observed with the MU radar and rocketsondes

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..339m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 339-346.

Computer Science

Sound

13

Gravity Waves, Middle Atmosphere, Radar Measurement, Radiosondes, Rocket Sounding, Stratosphere, Atmospheric Models, Mesosphere, Wind Velocity

Scientific paper

Wind motions in the altitude range of 5-90 km by means of the MU radar, rocketsondes and radiosondes are simultaneously observed. Dominant vertical scales of wind fluctuations due to gravity waves were 2-5 km in the lower stratosphere, about 5-15 km in the upper stratosphere and longer than 15 km in the mesosphere. The increase in the vertical scale with altitude is interpreted in terms of the saturation of upward propagating gravity waves. In the stratosphere, the observed vertical wavenumber spectra showed smaller amplitudes and more gradual slopes than the model values. Furthermore, the wind velocity variance in the stratosphere increases exponentially with an e-folding height of about 9 km, implying that the gravity waves were not fully saturated. On the other hand, the spectra in the upper stratosphere and mesosphere agreed fairly well with the model spectra. The variance in the mesosphere seems to cease increase of the wave amplitudes and agrees reasonably well with the model value.

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