Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0453l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0453
Physics
0310 Airglow And Aurora, 0342 Middle Atmosphere: Energy Deposition, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides
Scientific paper
Simultaneous observations of the OH Meinel and O2 Atmospheric (0,1) airglow intensity have been made by an OH/O2 zenith photometer at Maui, Hawaii (20.7 N, 156.3 W) since Jan. 2002. By combining these data with coordinated measurements using an all-sky OH imager and a meteor radar, the amplitude and phase of the airglow perturbations in the OH and O2 layers, as well as the characteristics of the high frequency gravity waves that induce these fluctuations, are determined. The observed intensity perturbation amplitude ratio and phase difference between the O2 and OH layer are compared with a 1-D model prediction to infer the gravity wave damping rate. The results show that heavily damped gravity waves are commonly observed in the mesopause region. The resulted mean flow accelerations are significant, suggesting that high frequency gravity wave dissipation play an important role in the momentum budget in this region. Possible mechanisms for gravity wave dissipation will also be discussed.
Li Fucai
Liu Alan Z.
Swenson Gary R.
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