Computer Science – Sound
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jats...40.2484s&link_type=abstract
Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 40, Oct. 1983, p. 2484-2496. NASA-supported research.
Computer Science
Sound
22
Atmospheric Circulation, Planetary Waves, Stratosphere, Wave Interaction, Geopotential Height, Geostrophic Wind, Nonlinear Equations, Satellite Sounding, Vortices, Wind Variations, Zonal Flow (Meteorology)
Scientific paper
Data from the LIMS instrument for January 1979 are used to provide further evidence for the often observed vacillation between the amplitudes of waves 1 and 2 in the stratosphere. The vacillation is shown to result primarily from nonlinear wave-wave interactions within the stratosphere. Two ways of interpreting nonlinearity are discussed. In the first, the basic state is defined to include large amplitude waves as well as the mean zonal wind. A forced wave propagates with respect to this asymmetric basic state, which can lead to changes in the conventional zonal wavenumber measured at one latitude. The other view of nonlinearity, interaction of wave with the zonal flow and with other wavenumbers are considered separately. Wave-wave interactions among waves 1, 2 and 3 are calculated. The derivation and computation of wave-wave interaction terms in the potential enstrophy balance are given. The observations indicate that enstrophy transfer among waves can be substantial even when the amplitude of one of the contributing waves is small. The computed enstrophy balance also demonstrates that wave-wave interactions can have a large effect on the interaction of waves with the mean flow.
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