The 26-Month Zonal Wind Oscillation in the Lower Stratosphere of the Southern Hemisphere
- 1 March 1968
- journal article
- Published by American Meteorological Society in Journal of the Atmospheric Sciences
- Vol. 25 (2) , 293-298
- https://doi.org/10.1175/1520-0469(1968)025<0293:tmzwoi>2.0.co;2
Abstract
Stratospheric winds observations over Australia for 7½ years show a quasi 26-month zonal wind cycle in both temperate and tropical latitudes. The amplitudes of the annual and quasi 26-month cycles obtained by harmonic analysis of the data reveal major differences between the oscillation in temperate and tropical regions. The phase of the oscillation is propagated downward in the tropics but is independent of height in middle latitudes. The vertical shear of the quasi 26-month component of the zonal wind is much larger in the tropics than elsewhere. The familiar amplitude maximum at about 25 km is found in the tropics, but for the southern latitude oscillation the amplitude continues to increase up to 30.5 km, the effective limit of observations.Keywords
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