Abstract
Summary. Properties of the Groves & Reynolds ‘orthotide’ functions are explored in application to two typical sea-level series. Long-term fluctuations of their mean products prevent the direct application of simple methods of analysis, including the direct extraction of radiational tidal constants. Independence and stability of the orthoweights in the presence of radiational tides are demonstrated numerically. Orders 0 to 9 seem sufficient to define typical tidal properties, with the largest weights occurring at orders 0 to 5. The very simple procedure of converting orthoweights to admittances or harmonic constants is applied, with satisfactorily stable results.
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