Gravity-wave motions in the mesosphere and lower thermosphere observed at Mawson, Antarctica

Details Gravity-wave motions in the mesosphere and lower thermosphere observed at Mawson, Antarctica Gravity-wave motions in the mesosphere and lower thermosphere observed at Mawson, Antarctica

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..593v&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 5, p. 593-602

Physics

30

Atmospheric Circulation, Gravity Waves, Mesosphere, Radar Measurement, Thermosphere, Antarctic Regions, Climatology, Meridional Flow, Wave Propagation, Wind Measurement

Scientific paper

We present the results of medium frequency (MF) radar observations of mean winds and waves in the height range 78-108 km at Mawson (67 deg S, 63 deg E), Antarctica. The measurements were made in the period from 1984 to 1990. Climatologies of the prevailing zonal and meridional circulations made with a 12-day time resolution show that the mean circulation remained relatively stable over the 6 yr of observation. Climatologies of gravity-wave motions in the 1-24 h period range were also generated. These reveal that the r.m.s. amplitudes of horizontal wave motions near the mesopause (approximately 90 km) are about 30 m/s, and that there is some anisotropy in the motions, especially at heights below 90 km. Meridional amplitudes are larger than zonal amplitudes, which suggests a preference for wave propagation in the north-south direction. Comparisons with Mesosphere Stratosphere Troposphere (MST) radar wind observations made near the summer solstice at Poker Flat, Alaska (65 deg N) and at Andoya, Norway (69 deg N) show similarities with the Mawson observations, but the wave amplitudes and mean motions are larger in magnitude at the northern sites. This suggests hemispheric differences in wave activity that require further study.

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