South Africa: CLIMATE PREDICTION MODELLING

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GREENIE WATCH

Excerpt:

Returning to Southern Africa, it is only within the past two decades that records have become long enough to identify the presence of statistically significant, 21-year (it varies within narrow limits), periodicity in the data and it's synchronous linkage with the double sunspot cycle. This indicates that the multi-year solar mechanism that produces changes in sunspot activity is closely, but not exactly, synchronous with the mechanism that produces climatic changes. This periodic behaviour is predictable on a multi-year scale, particularly droughts and sequences of above average rainfall and river flow.