PSMSL

PSMSL, the Permanent Service for Mean Sea Level, is the global data bank for long-term sea-level change from coastal tide gauges, founded in 1933 by Joseph Proudman and based at the National Oceanography Centre in Liverpool. It holds over 2,100 station records, the longest reaching back to the start of the 19th century, and receives data each year from about 60 suppliers across roughly 80 countries. PSMSL quality-controls each record, reduces it to a common Revised Local Reference datum so trends survive gauge changes, and publishes the monthly and annual means that underpin global sea-level-rise estimates. It is the archive end of the GLOSS network.