Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987adats...4..249l&link_type=abstract
Advances in Atmospheric Sciences, Volume 4, Issue 3, pp.249-263
Physics
Scientific paper
Scale analyses for long wave, zonal ultralong wave (with zonal scale of disturbance L 1˜104 km and meridional scale L 2˜103 km) and meridional ultralong wave ( L 1˜103 km, L 2˜104 km) are carried out and a set of approximate equations suitable for the study of these waves in a dry tropical atmosphere is obtained. Under the condition of sheared basic current, frequency analyses for the equations are carried out. It is found that Rossby waves and gravity waves may be separated for n⩾1 where n is the meridional wave number, whereas for n=0 and L 1˜1000 km, the mixed Rossby-gravity wave will appear. Hence it is confirmed that the above results of scale analyses are correct. The consistency between frequency analysis and scale analysis is established. The effect of shear of basic current on the equatorial waves is to change their frequencies and phase velocities and hence their group velocities. It increases the velocity of westward travelling Rossby waves and inertia-gravity and mixed waves, but decelerates the eastward inertia-gravity waves and the Kelvin wave. The recently observed low-frequency equatorial ocean wave may be interpreted as an eastward Kelvin wave in a basic current with shear.
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