Visual depictions of Sea Level Rise Posted on 3 March 2010 by
Peter Hogarth Guest post by Peter Hogarth Even many critics
would agree that global sea levels are currently rising,
regardless of recent scrutiny and revision of estimates of
predicted sea level rise. As pointed out previously, predicting
sea level rise is tough. The National Oceanic and Atmospheric
Administration (NOAA) puts it neatly, “To make predictions, we
need knowledge. To gain knowledge we need observations”. However
a recent claim disputes that current sea levels are rising
significantly. Is it possible to verify or falsify this
statement by looking at observations and data from the
scientific community concerned with measuring sea level? The
answer is yes. Measuring sea level is now a multidisciplinary
effort involving integration of observations from several global
networks of hundreds of tidal stations, calibrated with vertical
reference data from nearby GPS (Global Positioning System, which
now use the American GPS, Russian GLONASS an