Computer Science
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jats...48.2373e&link_type=abstract
Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 48, Nov. 15, 1991, p. 2373-2381.
Computer Science
1
Atmospheric Circulation, Planetary Waves, Temperate Regions, Tropospheric Waves, Vertical Air Currents, Wave Interaction, Atmospheric General Circulation Models, Atmospheric Heating, Baroclinic Instability, Baroclinic Waves
Scientific paper
Two methods are used to investigate the vertical tilts of planetary waves as functions of zonal wavenumber and frequency. The vertical tilts are computed by cross-spectral analysis of the geopotential heights at different pressures. In the midlatitude troposphere, the eastward-moving waves had a westward tilt with height, as expected, but the westward-moving waves with frequencies higher than 0.2/d showed statistically significant eastward vertical tilts. For a free Rossby wave, this implies that the Eliassen-Palm flux is downward along with its energy propagation. A downward energy propagation suggests an upper-level source of these waves. It is proposed that the eastward-tilting waves were forced by the nonlinear interaction of stationary waves and baroclinically unstable cyclone-scale waves. The predicted vertical tilt and phase speed were consistent with the observations. In addition, simulations of a general circulation model were analyzed. In the control run, eastward-tilting waves disappeared when the sources of stationary waves were removed. This is consistent with the present theory.
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