Quasi-biennial and semi-annual oscillations in equatorial wind fields constructed by data assimilation

Details Quasi-biennial and semi-annual oscillations in equatorial wind fields constructed by data assimilation Quasi-biennial and semi-annual oscillations in equatorial wind fields constructed by data assimilation

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2099s&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 19, p. 2099-2102

Computer Science

Sound

31

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

Since October 1991, the U.K. Meteorlogical Office has used the technique of data assimilation to produce global meteorological analyses of the troposphere and stratosphere. These analyses are constructed from conventional meteorological measurements in the troposphere and lower stratosphere, temperature soundings from NOAA polar-orbiting satellites. The analyses show very clear quasi-biennial and semi-annual oscillation in equatorial winds. The quasi-biennial oscillation has its maximum amplitude of about 20 ms-1 near 30 hPa, and exhibits descending easterly and westerly shear zones. Analyzed winds compare well with radiosonde observations in the lower stratosphere. The semi-annual oscillation has its peak amplitude of about 30 ms-1 near the stratopause. Winds near the equatorial stratopause show strong longitudinal variations on a planetary scale during both the westerly and easterly phases of the semi-annual oscillation.

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