Permanent Service for Mean Sea Level

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The Permanent Service for Mean Sea Level (PSMSL), established in 1933, is a repository for tide gauge data used in the measurement of long-term sea level change. The PSMSL is based at the National Oceanography Centre in Liverpool, England.

The PSMSL is financially supported by the UK Natural Environment Research Council, the International Council for Science World Data System, and the Intergovernmental Oceanographic Commission.