Seasonal and Diurnal Variations of Gravity Waves in the Mesosphere over the Andes Lidar Observatory and Maui

Details Seasonal and Diurnal Variations of Gravity Waves in the Mesosphere over the Andes Lidar Observatory and Maui Seasonal and Diurnal Variations of Gravity Waves in the Mesosphere over the Andes Lidar Observatory and Maui

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa11b1584l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA11B-1584

Physics

[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3360] Atmospheric Processes / Remote Sensing, [3384] Atmospheric Processes / Acoustic-Gravity Waves, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

All Sky OH imager observations at Maui (156 W, 21 N) and the Andes Lidar Observatory (Cerro Pachon, 71 W, 30 S) are analyzed with collocated meteor radar wind measurements using 2-d spectral analysis to infer gravity wave parameters and momentum flux in the mesopause region. The data at Maui spanning from 2002 to 2007 provides the climatology of gravity wave characteristics and momentum fluxes at a tropical oceanic location. The observation at ALO from September, 2009 provides one full-year data to characterize the seasonal variation of gravity waves and momentum fluxes at a midlatitude, mountainous location in the Southern Hemisphere. The comparisons between the results at these two sites show common features such as dominant wave phase speed and horizontal wavelength. However, the directionality of wave propagation shows strong seasonal and geographical differences. Gravity wave momentum flux shows a strong seasonal and diurnal variation which is anti-correlated with the background mean wind. The implications of the roles played by the momentum flux deposition on mean flow are explored on both seasonal and diurnal time scale. The seasonal/diurnal variations of wave occurrence frequencies at both locations are examined in terms of wave source variation and critical layer filtering.

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