Changes in the ocean tide during the 20th century have been reported for several parts of
the world by different authors. However, it has not always been clear whether the observed
changes have been local or regional in scale. This paper reports on a survey of tidal
changes in recent decades using a quasi-global data set of tide gauge information. Little
evidence has been found in Europe or the Far East (including Australasia and Asia) for the
extensive regional changes to the main tidal constituents reported recently for N America …