Longitudinal variability of the mesopause SAO

Details Longitudinal variability of the mesopause SAO Longitudinal variability of the mesopause SAO

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1991s&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 16, p. 1991-1994

Physics

6

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Paleoclimatology

Scientific paper

A longitudinal variation in the mesopause semi-annual oscillation (SAO) is documented from wind observations made by the High Resolution Doppler Imager satellite instrument. The asymmetry is dominated by a wavenumber 1 pattern with a variable phase. During the easterly phase of the mesopause SAO (equinoxes), maximum tropical easterlies occur over eastern South America and the Atlantic Ocean in the longitude band 300°-360°. During the westerly phase (solstices), the westerly winds descend more rapidly and are larger below ~80km in this same (Atlantic) longitude band. To the best that can be determined with sparse data, the longitudinal asymmetries near the stratopause are weak and are in phase with those in the mesosphere.

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