Annual and semiannual oscillations in the equatorial middle atmospheric winds

Details Annual and semiannual oscillations in the equatorial middle atmospheric winds Annual and semiannual oscillations in the equatorial middle atmospheric winds

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..373r&link_type=abstract

Advances in Space Research, Volume 13, Issue 1, p. 373-376.

Computer Science

3

Scientific paper

A quantitative analysis is made of the amplitudes and phases of the annual and semiannual oscillations in the zonal wind in the equatorial stratosphere and lower mesosphere, using the rocket data in the 20-80 km region at three stations, Thumba, Kwajalein, and Ascension Island which are around +/-8° latitude, but at different longitudes. The cycle-to-cycle variations in the amplitudes of annual and semiannual oscillations at the above three stations are studied for a 12-year period. It is observed that the annual and semiannual oscillation amplitudes have large cycle-to-cycle variation around the stratopause and also significant longitudinal asymmetries. A comparison with QBO shows that the variations of the AO and SAO amplitudes seem to be correlated with the phase of the quasi-biennial oscillation at 28 km, with a tendency of larger amplitudes occuring during the westerly phase of the QBO.

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