Posts Tagged ‘NOAA’


Boston Underwater?

March 24, 2009

Boston, you have been warned. Sea levels are rising , and if one of the IPCC’s five scenarios is correct, the world’s oceans will rise somewhere between 18 and 59 cm (7 to 23 inches) by 2100. If that isn’t terrifying enough for the people living on the New England coast, the Boston Globe now tells us that the ocean near Boston will rise 8 inches more than the world average. How will the hapless rubes of Boston cope with this onslaught of Atlantic water?

I wouldn’t lose to much sleep worrying about the folks in Boston when it comes to pushing back against the ocean. Excerpts from the following maps were used to make an animation of the changing coastline in Boston:

  • A 1775 map showing the Boston area with the rebel military works. Note especially the isthmus, known as Boston Neck< that connects the town of Boston to the mainland.
  • An 1838 George W. Boynton engraving of Boston area from a Thomas G. Bradford atlas.
  • USGS map of Boston area.
  • A 2009 satellite image from Google Earth

The top of the animation shows the maps after photoshopping to make the land and water more obvious. The bottom of the animation shows the unaltered excerpts of the maps or images.


The panic prone will argue that our Bostonian ancestors dealt with a static ocean, not a rising ocean. Not so fast. Check out the NOAA graph below (click inside graph to see it in context at NOAA site). It shows a sea level rise rate of 2.63 mm/yr for the last 100 years in Boston. At that rate it will rise 23.9 cm (9.4 inches) by 2100.

Boston sea level rise

Boston sea level rise data from NOAA. Click in image fro view in context.

Anyone who panics over the IPCCs 100 year projections of rising sea levels does not understand the perseverance and ingenuity of free people. Then there are others, like James Hansen, who enjoy the feeling of panic so much that that they exagerate the probable sea level rise for this century to get their thrills. But that is a story for another day…