Comparison of geostrophic and observed winds in the upper mesosphere over Saskatoon, Canada

Physics

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Atmospheric Circulation, Geostrophic Wind, Mesosphere, Winds Aloft, Autumn, Height, Radar Measurement, Saskatchewan, Winter

Scientific paper

Thicknesses derived from the Stratospheric and Mesospheric Sounder on Nimbus 7 and 30-mbar height analyses based on radiosondes have been combined to give monthly mean height charts of the upper mesosphere, (0.01-mbar level, approximately 78-80 km). Four years of data are available, 1979-1982. Based on this material, the geostrophic winds were derived for the grid point 50 deg N, 110 deg W and compared with winds observed over Canada (52 deg N, 107 deg W) using the Saskatoon medium frequency radar. Agreement, especially in the summer months, was very good; however, significant ageostrophy was evident in autumnal and winter months. Possible causes are confluence associated with large-scale circulations and gravity-wave drag.

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