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Confounding influences are accounted for in measurements and while they leave some noise in the record they cannot account for the observed upward trend.
Various technical criticisms are mounted against satellite altimeter measurements by skeptics.
These two independent systems mutually support the observed trend in sea level.
In the months after Fukushima, I also formed the Center for Marine and Environmental Radioactivity, in part to help share the most accurate, up-to-date information about radiation from human and natural sources and, when it became clear that there was no coherent and consistent source of government funding to monitor radiation in U. waters and to support public education, I formed a citizen-science/crowd-funding initiative called Our Radioactive Ocean at WHOI.
Tide gauges must take into account changes in the height of land itself caused by local geologic processes, a favorite distraction for skeptics to highlight.
Not surprisingly, scientists measuring sea level with tide gauges are aware of and compensate for these factors.
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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.