Tide Gauge Evidence: Sea Levels Rose Faster Before 1950 Than Since
In recent years it has become increasingly apparent that tide gauge measurements of sea level rise often do not align with climate model expectations.
The models are predicated on the assumption that anthropogenic CO2 emissions, which have risen explosively since about 1950, are the drivers of modern sea level rise.
Evidence from observed sea level trends has not been cooperating with this narrative, however.
Tide gauges indicate there has been a substantial overall reduction in the rate of sea level rise since about 1950 rather than the expected substantial acceleration.
For example, UK oceanographer Simon Holgate reported a 29% deceleration in global sea level rise rates from the first half of the 20th century (1904-1953) to the second half (1954-2003)
Holgate, 2007 “The rate of sea level change was found to be larger in the early part of last century (2.03 ± 0.35 mm/yr 1904–1953), in comparison with the latter part (1.45 ± 0.34 mm/yr 1954–2003).”
A small sampling of regional tide gauge results (SW Pacific, Japan) affirm the deceleration of sea level rise since the mid-20th century and indicate the highest rates of sea level rise occurred before human CO2 emissions began accelerating rapidly.