An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations

Details An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..71f&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 71-1, CiteID 1429, DOI 10.1029/2001GL013753

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Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342), Meteorology And Atmospheric Dynamics: Thermospheric Dynamics (0358), Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

Airglow measurements of gravity wave and smaller-scale flow features, used together with other measurements of larger-scale winds, provide a unique ability to quantify gravity wave dynamics at mesopause altitudes. We consider here an event observed with an OH airglow imager and the meteor radar at the MU Observatory in Japan. This was a wave breaking event of unusually large amplitude and momentum flux. Our hypothesis is that such events are relatively common, and that the resulting local forcing of the mean flow represents a vigorous source of secondary gravity waves that penetrate well into the thermosphere. Our analysis suggests a gravity wave momentum flux of ~900 m2s-2, far larger than estimated by other techniques, and a mean flow acceleration of ~80 ms-1 in less than an hour. We also estimate the scales and frequencies of the secondary waves resulting from this local body forcing.

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