Estimates of gravity wave momentum fluxes in the winter and summer high mesosphere over northern Scandinavia

Physics

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Gravity Waves, Mesosphere, Scandinavia, Meridional Flow, Summer, Vertical Air Currents, Wind Profiles, Winter, Zonal Flow (Meteorology)

Scientific paper

As part of the MAP/WINE campaign (winter 1983-1984) and the MAC/SINE campaign (summer 1987) high resolution wind profiles were obtained in the upper mesosphere using the foil cloud technique. Vertical winds were derived from the fall rate of the foil clouds and are used for estimating the momentum fluxes associated with vertical wavelengths shorter than about 10 km. From the ensemble average of 15 observations over an altitude range of 74-89 km, a zonal net momentum flux of +12.6 + or - 4.5 sq m/sq s is calculated in summer. The average of 14 measurements in winter between 73 and 85 km indicates a zonal net momentum flux of -3.7 + or - 2.4 sq m/sq s.

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