Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51a1203l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA51A-1203
Other
[3332] Atmospheric Processes / Mesospheric Dynamics
Scientific paper
Six-year (2002-2008) meteor radar measurement between 80 and 100 km at Maui, Hawaii (21N, 156W) were used to investigate the tidal variation in horizontal wind. The gravity wave activities and momentum fluxes were estimated using the variance of radial wind from all meteor detections, and compared with the results from the simultaneous Na lidar measurements. The seasonal and interannual variabilities of the tides and gravity waves were analyzed and their relationships were studied. It was found that the dominant variability of the diurnal tide is a strong semi-annual variation with maximum in equinoxes. The gravity wave activity was also strongest during equinoxes. Both diurnal tides and gravity waves also show a quasi-two-year oscillation and are also in phase with each other. This is likely modulated by the QBO in the stratosphere. The momentum flux also shows strong seasonal and interannual variabilities.
Franke Steve
Liu Alan Z.
Lü Xiancai
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