Not surprisingly, scientists measuring sea level with tide gauges are aware of and compensate for these factors.Confounding influences are accounted for in measurements and while they leave some noise in the record they cannot account for the observed upward trend.As can be seen in an inset of the graph above, tide gauge and satellite altimeter measurements track each other with remarkable similarity.These two independent systems mutually support the observed trend in sea level.Various technical criticisms are mounted against satellite altimeter measurements by skeptics.Indeed, deriving millimeter-level accuracy from orbit is a stunning technical feat so it's not hard to understand why some people find such an accomplishment unbelievable.
This helmet has a major claim to fame – it was worn by Jens Voigt during his successful tilt at the Hour Record.Aea level rise corroborates other evidence of global warming The blue line in the graph below clearly shows sea level as rising, while the upward curve suggests sea level is rising faster as time goes on.The upward curve agrees with global temperature trends and with the accelerating melting of ice in Greenland and other places.All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Around 1990 it became obvious the local tide-gauge did not agree - there was no evidence of 'sinking.' So scientists at Flinders University, Adelaide, set up new, modern, tide-gauges in 12 Pacific islands.Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. Gavin Schmidt investigated the claim that tide gauges on islands in the Pacific Ocean show no sea level rise and found that the data show a rising sea level trend at every single station. Sea level rises as ice on land melts and as warming ocean waters expand.