I’ll do as before, namely:
As with the New England (NE) region, the MAN is not rising at a steady rate (i.e. following a straight line), there’s more than that going on. Here are the two trend estimates (lowess smooth in red, piecewise linear fit in blue):
This piecewise linear fit has its turning point in 1989. The rates (of sea level rise) before and after are estimated at 2.8 +/- 0.9 mm/yr and 5.1 +/- 1.3 mm/yr. We can also compare the rate estimates from the lowess smooth (in red) to that from piecewise linear fit (in blue, which is of course just two distinct rates):
These rates are higher than we found for NE, both pre- and post-1990. The time series of differences between them shows how they have diverged steadily:
Tests show no evidence of anything but a straight-line increase in the regional difference, with sea level rising in MAN than in NE by 1.2 +/- 0.2 mm/yr.
Again, we see that there is acceleration in the tide gauge record from the Mid-Atlantic North (MAN), starting around 1989. We also see a consistently faster rise along the MAN, slowest in NE, which is what is expected if the bulk of the difference is because of glacial isostatic adjustment.
But those are just two of the four U.S. east coast regions. So … more to come …
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