Large-scale waves in the upper-mesosphere at Antarctic high-latitudes

Mathematics – Logic

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Antarctic Regions, Lamb Waves, Mesosphere, Wind Measurement, Diurnal Variations, Doppler Radar, Meteorological Radar, Planetary Waves, Power Spectra

Scientific paper

Upper-mesosphere combined optical measurements of wind and temperature fields at Amundsen-Scott Station (South Pole) and wind radar measurements at Scott Base (78 deg S, 167 deg E) show the presence of large-scale waves in this region of the atmosphere. At Amundsen-Scott the largest amplitude wave observed with subdiurnal periodicity appears with a frequency near 2.4/day (about 10.1 hour period), with a westward phase progression of wavenumber one. The presence of a wave with this periodicity is confirmed by the observations at Scott Base. The combination of the experimentally-found period, phase progression, associated small-temperature oscillations, and theoretical considerations lead to the interpretation of this wave as a Lamb wave.

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