Abstract
Planetary waves (2 day–30 day) and tidal wave (8 h, 12 h, 24 h) oscillations are studied by forming height (60–110 km) and time (January–December) contour cross-sections and comparing with mean winds for 1981, but also on occasion 1982. Strong seasonal variations with evident wave-mean flow couplings are demonstrated. The zonal mean wind momentum budget (80–90 km) is assessed using cross-sections of northward-eastward covariances for wind fluctuations in the planetary and tidal wave period ranges and also gravity wave cross-sections. Dominant contributions are due to coriolis torque in the meridional mean flow and vertical divergence of the gravity wave momentum flux, although planetary wave contributions may be large also in winter months.
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