Sea Level PCA, from the Baltic Sea to el Niño

I’ve made a new estimate of global sea level based on a subset of all the tide gauge data in PSMSL (Permanent Service for Mean Sea Level). I’m just doing the 20th century, and I’ve used only those data sets with a decent amount of data, at least 360 monthly values since the year 1900. That leaves a “mere” 723 tide gauge stations to work with. Here’s where they are located:

And here’s the estimated global average sea level since the year 1900:

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