A Remarkable Correlation Between Short Period Gravity Waves and Semi Annual Oscillation of the Zonal Wind in the Equatorial Mesopause Region

Details A Remarkable Correlation Between Short Period Gravity Waves and Semi Annual Oscillation of the Zonal Wind in the Equatorial Mesopause Region A Remarkable Correlation Between Short Period Gravity Waves and Semi Annual Oscillation of the Zonal Wind in the Equatorial Mesopause Region

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa31a1951n&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA31A-1951

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[3332] Atmospheric Processes / Mesospheric Dynamics, [3334] Atmospheric Processes / Middle Atmosphere Dynamics

Scientific paper

Variability of mean zonal winds and the horizontal wind velocity variance of short period (20-120 min) gravity waves (GWs) in the equatorial mesopause region is studied using medium frequency (MF) radar observations from Pameungpeuk (7.4oS, 107.4oE) during 2004-2010. The zonal winds display a distinct semiannual oscillation (MSAO) with westward winds during equinoxes and eastward winds during solstices. Further, the westward winds during March equinox are largely enhanced during 2008 and 2009. The short period GW variance also shows a semiannual oscillation with enhanced activity during equinoxes. A good correlation is observed between the zonal winds and the short period GW variance in 2008-2010, with the winds being westward during the times of enhanced GW activity. Such a correlation, however, is less obvious during 2004-2006. The long period (10-20 hr) GW variance, on the other hand, does not show such a correlation throughout the observation period. A plausible explanation is offered based on the seasonal variation of GW activity in the troposphere and their subsequent filtering by the wind systems in the troposphere and stratosphere.

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