Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..507k&link_type=abstract
Geophysical Research Letters, vol. 5, June 1978, p. 507-510.
Physics
1
Atmospheric Models, Gravity Waves, Radar Measurement, Upper Atmosphere, Wave Interaction, Doppler Radar, Hydrodynamic Equations, Richardson Number, Signal Measurement
Scientific paper
Acoustic-gravity waves detected by the Jicamarca VHF radar at tropospheric and stratospheric heights have properties that cannot be explained by simple theoretical models. The sign of the vertical wavenumber, in particular, reverses in a region with considerable background wind shear indicating wave-wind interaction in a critical layer. A model is analyzed in which a gravity wave propagates into a critical layer with small Richardson number so that near total reflection and strong transmission take place due to the extraction of momentum and energy from the mean flow. Solutions of the linearized hydrodynamic equations describing gravity wave propagation in a viscid compressible atmosphere with shear flow show that this model is consistent with the observed data.
Klostermeyer Juergen
Liu Chang-Hong
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