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Time series analysis II: frequency-domain

Aim Variations in the climate may take place on various spatial and temporal scales. Sometimes, the variations are due to oscillation which recur in periodic fashions. Such periodic changes are good: if we know them, then we can start making predictions. In order to identify periodic oscillations, one can describe the temporal evolution in terms of harmonics: sinusoidals associated with specific frequencies.

Typical examples are the diurnal, annual and tidal variations, which are periodic and easy to predict.


David Stephenson