Abstract
Twice-daily infra-red satellite imagery for the winters (June to September) of 1973–77 are used to investigate cyclonic activity over the Southern Hemisphere. The analysis uses a previously developed satellite-observed cloud vortex classification scheme and “mean” patterns are derived for the different signature types. It is found that cyclogenesis is pronounced in both lower-middle and high latitudes in winter and conforms generally to the locations of the major hemispheric long wave troughs. Cyclolysis is observed to be most significant in certain sectors of the Antarctic Ocean and to exhibit little interannual variation in spatial patterns for the period studied. High frequencies of lower-latitude “cut-off” cyclones occur in the Australian-New Zealand region during winter. The results of this analysis are compared with previous non-satellite and satellite-derived studies for the Southern Hemisphere.
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