QBO Influences on Large-Scale Waves in the Equatorial MLT Region

Details QBO Influences on Large-Scale Waves in the Equatorial MLT Region QBO Influences on Large-Scale Waves in the Equatorial MLT Region

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa62a0380g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA62A-0380

Physics

3332 Mesospheric Dynamics, 3384 Waves And Tides

Scientific paper

The MLT wind data over the years 1993-2001 obtained from the MF radar operated at Tirunelveli (8.7 N, 77.8 E) were used to examine the possible association of the large-scale wind and wave fields at mesopause heights with the stratospheric QBO. The diurnal tide in the zonal wind over Tirunelveli shows enhanced activity when the stratospheric QBO is in the westerly phase. It has been shown earlier from the satellite and ground-based diagnostics that one of the westward phases of the mesopause SAO is enhanced during the QBO westerly phase. Earlier numerical experiments with the Global Scale Wave Model (GSWM) have indicated that the diurnal tidal response at MLT heights is largely insensitive to the QBO observed in the stratospheric ozone. The present work focuses on the non-migrating tides generated by the latent heat release in the troposphere that may show an interannual variability. With this forcing, the numerical experiments to be performed with the GSWM will examine whether the observed MLT tidal variability can be accounted for by the interannual variability in the tropospheric forcing. The 6.5-day wave has been observed to be a dominant planetary wave component in the MLT region over Tirunelveli. The 6.5-day wave activity seems to be stronger during the stratospheric easterly phase. This wave has been identified to be a westward propagating disturbance arising from potential shear zones at stratopause levels. The interannual variability of this wave is intriguing. The sources of this variability are examined in the present work. The 3.5-day ultra-fast Kelvin wave, an equatorially trapped planetary wave mode, however, does not show any preference of activity during any of the QBO phases.

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