Computer Science
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jats...40.1321v&link_type=abstract
Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 40, May 1983, p. 1321-1333. Research supported by the Australian Rese
Computer Science
207
Atmospheric Turbulence, Gravity Waves, Internal Waves, Mesosphere, Momentum Transfer, Radar Measurement, Doppler Radar, Phase Velocity, Planetary Waves, Radar Beams, Vertical Air Currents
Scientific paper
The probable importance of internal gravity waves in balancing the momentum budget of the mesosphere has been emphasized in recent theoretical studies. The present investigation is concerned with a method by which the vertical flux of horizontal momentum can be measured by ground-based radars. The method requires the comparison of the Doppler shifts in backscattered radar echoes from the upper atmosphere using two or more narrow beams offset from the vertical. It is assumed that fluctuations of the Doppler shifts are caused by gravity wave wind oscillations. Provided the atmospheric motions are horizontally homogeneous, the momentum flux is proportional to the difference of the variances of the Doppler velocities. The technique has been applied to observations of the upper mesosphere made with a HF radar located near Adelaide, Australia.
Reid Iain M.
Vincent Anthony R.
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