Interannual variations in the half-yearly cycle of pressure gradients and zonal wind at sea level on the Southern Hemisphere
Open Access
- 1 January 1984
- journal article
- Published by Stockholm University Press in Tellus A: Dynamic Meteorology and Oceanography
- Vol. 36A (1) , 76-86
- https://doi.org/10.1111/j.1600-0870.1984.tb00224.x
Abstract
We outline the half-yearly oscillations in sea-level pressure gradients and zonal winds on the Southern Hemisphere by means of daily synoptic maps for several years. The pressure oscillation has amplitude peaks near 50° and the Antarctic coast, separated by a minimum along 60° where the phase changes from maxima in the extreme seasons in the south to maxima in the transitional season in the north. The zonal geostrophic wind consequently has a half-yearly wave with equinoctial maxima in the latitudes near 60°, and one with solstitial maxima north of 50°. We describe the interannual variability of the half-yearly oscillations in the pressure gradients and winds, and give examples of the oscillations during FGGE and the IGY. DOI: 10.1111/j.1600-0870.1984.tb00224.xKeywords
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