Abstract
The dynamics of the Antarctic and Arctic mesopause regions (ca. 95 km) are investigated through comparative analyses of winds measured by radars at the Scott Base (78°S), Molodezhnaya (68°S), and Mawson (67°S) Stations in the Antarctic, and the near-conjugate stations of Heiss I. (81°N) and Poker Flat (65°) in the Arctic region. The data are analyzed specifically to delineate hemispheric differences in mean monthly prevailing and semidiurnal tidal wind climatologies, and show the circulation systems in the Arctic and Antarctic mesosphere and lower thermospheres to exhibit significant asymmetries and interannual variability. In addition, circulation patterns at nominal latitudes of 67° and 80° within a given hemisphere differ quite substantially, suggesting existence of a higher-latitude circulation system in addition to the well-documented middle latitude one that extends at least between 35°–70° in each hemisphere. Existing empirical and numerical models are shown to be deficient in reproducing some salient characteristics of these high-latitude circulation systems.
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