A tide gauge record must always start about the time of low ENSO waters and possibly include a datum shift
Guest essay by Albert Parker
In addition to the case of Aden, discussed in Parker & Ollier (2017) and Parker & O’Sullivan (2018), that is only one of the many where the data proposed by the PSMSL are not trustworthy, another example recently added to the long list is Guam (Parker & Ollier, 2018).
Guam, Apra Harbor
For the tide gauge of Guam, Apra Harbor, www.psmsl.org/data/obtaining/stations/540.php, recently analysed in Parker & Ollier (2018), the PSMSL only mentions one of two data shifts following recent earthquakes, the one less evident of the two likely in the data. This datum shift is then used by NOAA to compute the rate of rise of the sea levels starting from low ENSO waters. The computation also suffers of the undetected datum shift, further…
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