Figure 2. Annualized mean sea level changes from 1912 to 2011 at the Portland, ME tidal station, including seasonal signals. Sea level has been rising at a rate of about 1.9 mm per year over this time period, equal to about 7.5 inches per century. Error bars show the calculated standard error for the entire dataset. Data courtesy of NOAA's Tides & Currents website.
Last updated on April 30, 2012