From "Is Tuvalu really sinking?" -
http://www.pacificmagazine.net/issue/2002/02/01/is...
....let's check the instruments. As it turns out, estimates of globally averaged sea level rise in the 20th century are irrelevant since Tuvalu's local sea level change is very different from the globally averaged change. There are three estimates of sea level changes for Tuvalu. The first is a satellite record showing that the sea level has actually fallen four inches around Tuvalu since 1993 when the hundred-million dollar international TOPEX/POSEIDON satellite project record began. Second comes from the modern instruments recording tide gauge data since 1978. There the record for Tuvalu shows ups and downs of many inches over periods of years. For example, the strong El Nino of 1997-98 caused the sea level surrounding Tuvalu to drop just over one foot. The El Nino Southern Oscillation is a natural - as opposed to man-made -future of the Pacific Ocean, as areas of the Pacific periodically warm then cool every few years, causing significant sea level rises and falls every few years in step with the co-oscillations of the ocean and atmosphere. The overall trend discerned from the tide gauge data, according to Wolfgang Scherer, Director of Australia's National Tidal Facility, remains flat. "One definitive statement we can make," states Scherer, "is that there is no indication based on observations that sea level rise is accelerating." Finally, there is the new estimate by scientists at the Centre Nationale d¹Etudes Spatiales who also find that between 1955 and 1996 the sea level surrounding Tuvalu dropped four inches.
All these measurements show that Tuvalu has suffered, at worst, no sea level rise.
Halifax tidal guages indicate no rise or fall in sea level for decades.
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