Simulation of the global structure of stationary planetary waves in the mesosphere and lower thermosphere

Details Simulation of the global structure of stationary planetary waves in the mesosphere and lower thermosphere Simulation of the global structure of stationary planetary waves in the mesosphere and lower thermosphere

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55...33p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 1, p. 33-40.

Physics

15

Atmospheric Models, Mesosphere, Planetary Waves, Thermosphere, Computerized Simulation, Coriolis Effect, D Region, Geostrophic Wind, Zonal Flow (Meteorology)

Scientific paper

When simulating the global structure of stationary planetary waves (SPW) the problem of obtaining the numerical solution in the equatorial region appears. It results from the presence of apparent singularities in the operator of the SPW latitudinal structure when the Coriolis parameter is small. The new method based on SPW latitudinal operator inversion is proposed. This method permits the difficulties arising from the simulation of stationary large scale disturbances at low latitudes to be avoided. The global structure of SPW with zonal wave number m = 1 at the mesosphere and lower thermosphere heights has been calculated for the background zonal wind distribution representing a climatic picture of the solstice conditions. In the region of the mean zonal westerlies the SPW penetration across the equator is obtained. The SPW at low latitudes are shown to appear most significantly in the zonal component of the wind velocity. The influence of planetary wave motions on the distribution of longlived species in the ionospheric D-region and at the heights of lower thermosphere are discussed.

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