Physics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..511p&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 511-525.
Physics
1
Scientific paper
Based on an empirical ageostrophic meridional wind model for heights of 70-110 km the global structure of velocity stream functions in meridional plane is considered. It is shown that the cellular structure of circulation patterns is typical of the upper mesosphere/lower thermosphere region. The high-latitude position of the prevailing cells, the stream function signs and magnitudes as well as their total number are different for the annual mean circulation and for the annual and semiannual cycle. The observed circulation structure is maintained due to vertically propagating momentum fluxes. These fluxes are calculated by integrating the diagnostic equation, in which a derivative of the horizontal momentum flux with respect to latitude is neglected. For the annual mean state there is a certain interhemispheric symmetry in the global flux structure, whereas for the fluxes, stipulated by annual and semiannual harmonics of seasonal variation, the flux value in the Northern and Southern Hemispheres is opposite in sign. The analysis of possible sources of the vertical momentum fluxes at 70-110 km has shown that dissipating internal gravity waves most probably make the major contribution to the annual variations of these fluxes, which in their turn mainly maintain the annual cycle of the global meridional circulation in the lower thermosphere/upper mesosphere. The role of the semidiurnal tide in maintaining of annual mean meridional circulation is still under question.
Portnyagin Yu. I.
Solovjeva T. V.
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