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. 36 (1) , 76
- https://doi.org/10.3402/tellusa.v36i1.11467
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°S and the Antarctic coast, separated by a minimum along 60°S 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°S, and one with solstitial maxima north of 50°S.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.Keywords
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