A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2015 Apr 16, 12:06 -0700
" While we're at it (Waterworld and all), below (attached) you'll find the updated sea level data for the tide gauge at the Battery at the south end of Manhattan, NYC, one of the longest running tide gauge data sets in the world. "
The Marégraphe in Brest started operation in 1679 with almost complete archives since late 18th Century, and fragmentary ones for its first century of operation. And quite possibly there might be some older one somewhere in the UK (Where ? When ? I am interested to know).
At the beginning this Marégraphe was only a height recorder, as the mean sea level trend/variation was probably not a worrying topic then.
A quite interesting PHD thesis has been performed from its data (http://www.sonel.org/IMG/pdf/ThesePOUVREAU.pdf), including the mean sea level variations. Unfortunately for English only readers, it is essentially written in French (a few digests in English here and there though). A quite interesting 400 + page document.