![]() A smaller number of steps are confirmed by “buddy-checking” against neighbouring tide gauges. A comprehensive data archaeology exercise was carried out which showed that these step-like errors are mostly coincident with recorded site-specific changes in instrumentation, and that in many cases the periodic tide gauge calibration records can be used to quantify these steps. This combination reduces the residual variability seen at tide gauges around the coast of the British Isles to the point that a number of previously unrecognised steps in individual records become apparent, permitting a higher level of quality control to be applied. Far field variability is accounted for using a “common mode”. Local sea level variability is accounted for using a tide and surge model. ![]() This is achieved by lengthening the sea level records where possible, then removing known sources of variability, and then further adjusting for datum errors that are revealed by the previous processes after verification using metadata from archived sources. ![]() This paper describes methods of obtaining improved estimates of long-term sea level trends for the British Isles.
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