Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........9a&link_type=abstract
Thesis (PhD). UNIVERSITY OF COLORADO AT BOULDER, Source DAI-B 62/08, p. 3697, Feb 2002, 123 pages.
Other
Scientific paper
A 12-h s = 1 oscillation has been observed over the South Pole, and longitudinal variations of the semidiurnal tide at mid northern latitudes have been ascribed to the presence of nonmigrating tides. A three-dimensional nonlinear spectral model is used to study nonlinear wave/wave interaction as a possible mechanism for the generation of nonmigrating tides in the mesosphere and lower thermosphere. In particular the s = 1 and s = 3 nonmigrating semidiurnal tides are studied as a by- product of the nonlinear interaction between the semidiurnal s = 2 migrating tide and a stationary s = 1 planetary wave in the lower and middle atmosphere. This process is found to yield significant amplitudes (~10-30 ms-1) of the nonmigrating semidiurnal components with s = 1 and s = 3 in the upper atmosphere. Comparisons with monthly nonmigrating tidal amplitudes and phases at 95 km derived from HRDI and WINDII wind measurements from UARS show good agreement with the model simulations. The effect of the dissipating nonmigrating tides on the zonal mean circulation is found to reinforce that of the migrating component, contributing ~10-20ms-1 to the zonal wind field and ~5-10 ms-1 to the mean meridional wind field. Several other wave components are generated through nonlinear interactions, including 6-hour tides with zonal wavenumbers s = 0, 1, 4 and a semidiurnal oscillation with s = 6. These wave components have amplitudes in the range 6-30 K in the 110-150 km height regime. The combination of all nonmigrating tides together with the migrating component suggests significant longitudinal variations in the semidiurnal tide. Tidal and planetary wave influences on the atomic oxygen greenline emission are also studied. In particular, effects of the diurnal tide, the two-day wave and migrating and nonmigrating semidiurnal tides are investigated. This is done through a one-dimensional chemical/dynamical model that solves the continuity equation for a variety of species by means of a Finite Element technique. Results obtained show that in all cases, advection by the vertical winds is the main source for the structure of the greenline emissions. Diurnal tidal effects, as well as those from the two-day wave, agree with satellite observations. Semidiurnal nonmigrating tides induce a significant longitudinal variation in emission, with changes of approximately 40% at mid latitudes at 94 km.
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