Investigation of a `Wall' Wave Event Using Airglow and Na Wind/Temperature Lidar Measurements

Details Investigation of a `Wall' Wave Event Using Airglow and Na Wind/Temperature Lidar Measurements Investigation of a `Wall' Wave Event Using Airglow and Na Wind/Temperature Lidar Measurements

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa31a1125l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA31A-1125

Physics

3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides

Scientific paper

A `wall' wave was observed on August 12, 2004 at Maui, HI (20.7° N, 156.3° W) by an all-sky OH airglow imager. The `wall' wave emerged from the SW horizon at ˜ 0800 UT. It propagated toward the NE, passed the zenith at ˜ 0900 UT, and disappeared at ˜ 1200 UT. The brightness of the OH airglow in the whole sky increased by about 100% during the passage of the `wall' wave. Small-scale high-frequency gravity waves were observed to be phase-locked with the `wall' wave. The dynamical effects of the `wall' wave are investigated using simultaneous temperature and wind measurements made by a Na lidar system, and wind observations made with a meteor radar. It is found the sharp increase of the zenith airglow intensity is accompanied by a rapid increase of temperature of ˜ 60 K in 30 min in the 90-95 km range. The tidal structures in the horizontal winds were significantly changed during the time the `wall' wave was observed. The phases of the diurnal tidal winds were lagged by 4-5 hours comparing with the day before (August 11, 2004). The underlying mechanisms for these observed features are explored.

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