Estimates of the components of sea surface elevation contributing to the long-term variation of mean sea level around New Zealand

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Abstract
The relative sizes of the factors contributing to the variations in mean sea level around New Zealand are examined. The oceanographic influence (specifically, changes in density and the oceanic circulation) appears to produce the largest variation, with ranges of the order of 10–20 cm yr-1. With an expected eustatic change of the order of 0.1–0.2 cm yr-1 long-term accurate sea-level records of at least 15–20 years are needed to allow accurate estimates of the eustatic and tectonic changes.

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