In order to
use tidal gauges to reliably estimate global sea level changes, researchers have to successfully separate the components of shifting land heights and local sea level variability from any global trends.
Some time ago I started looking at sea levels,
using tidal gauge info, to see how it correlated to temperature.
The biggest difficulty in
using tidal gauges to study global sea level trends is separating local changes from global changes.
Not exact matches
We also monitor marine debris in the sandy beach and
tidal habitats of our coastal MPAs to
gauge whether human
use of these areas may have negative impacts.
However, as we have seen throughout this section, the
tidal gauge estimates the IPCC
used to estimate global sea level trends are contaminated by local trends, such as tectonic activity, post-glacial rebound... and the coastal subsidence that Syvitski et al. identified!
As you become interested in IPCC AR5 Fig 3.14, do note that the three data sets presented are derived from
tidal gauges using two significantly different approaches.
And
using Church & White
tidal gauge data (which today only runs to 2013 but AR5 had data to 2009), the final years are running above 4mm / yr while such 11 - yr trends calculated through the full record never top 3mm / yr.
Nik — I showed your claims about
tidal gauges were incorrect at scholarsandrogues.com
using the very website you
used to generate the image you linked to above, and yet you repeated the incorrect claims here at the NYTimes.
Firstly, the Australian National
Tidal Facility (which installed and monitored the tide
gauges starting in 1991)
used to be managed by Flinders University in Adelaide — but the facility was transferred to the National
Tidal Centre run by the Bureau of Meteorology... in 2003!