Gravity-Wave/Tidal Interactions in the Mesosphere and Lower Thermosphere over Rothera, Antarctica (68S, 68W)

Details Gravity-Wave/Tidal Interactions in the Mesosphere and Lower Thermosphere over Rothera, Antarctica (68S, 68W) Gravity-Wave/Tidal Interactions in the Mesosphere and Lower Thermosphere over Rothera, Antarctica (68S, 68W)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.a13i0401b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #A13I-0401

Other

[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3384] Atmospheric Processes / Acoustic-Gravity Waves

Scientific paper

A simple technique for measuring gravity-wave activity has been used to investigate gravity-wave/tidal interactions. The technique uses the radial velocities of individual meteors recorded by meteor radar to derive a statistical measure of the activity of the high-frequency gravity-wave field. This technique can measure gravity waves with horizontal wavelengths of up to about 400 km and periods up to approximately 3 hours. Interactions between the observed gravity-wave field and the background winds, tides and planetary waves are investigated using data collected between February 2005 and December 2008 by a meteor radar based at Rothera, Antarctica (68S, 68W). The results reveal modulations of the gravity-wave field at tidal and planetary-wave periods. Correlations between the zonal winds and the gravity-wave field measured by the meteor radar reveal that the phases of the modulations are consistent with the suggestion that there is strong filtering by tidal winds acting on an azimuthally-anisotropic gravity-wave field.

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