Some numerical results of the quasi-two-day wave excitation and propagation in the unstable summer middle atmosphere

Details Some numerical results of the quasi-two-day wave excitation and propagation in the unstable summer middle atmosphere Some numerical results of the quasi-two-day wave excitation and propagation in the unstable summer middle atmosphere

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3479m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3479

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Basing on numerical calculations we have demonstrated that some changing of the climatological background atmosphere could lead to an unstable mean zonal wind distribution in the middle atmosphere of the summer hemisphere. This instability forces oscillations with a period of about 2 days and zonal wavenumbers s = 3 and 4. There are variations in the mean zonal wind distribution due to the excitation and propagation of these waves and numerical results correspond to features of these changes obtained in experimental studies. Strong 2-day waves in turn are unstable and can generate waves with longer periods and lower zonal wavenumbers. This effect is significant only for very strong 2-day waves. It is shown that the 2-day wave with s=3 forced by non-linear interaction between 10-14 day planetary waves and the 2-day wave of zonal wave number 4 is unstable. This wave instability generates secondary waves more easily than the primary 2-day waves and these secondary waves may be observed. In this work we used a simple 3-D nonlinear model designed for modeling of planetary wave propagation and interaction between waves in the atmosphere.

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