The West Coast of North America has 20 long-term (90+ years) tide gauges measuring relative sea-level changes.
The East Coast has 33. Of the 53 total tide gauges, 45% (24) are negatively accelerating, 14 document falling sea levels, and just 11 have sea levels rising more than 3 mm/yr.
Image Source: Boretti, 2019
A cooling/non-warming North America
A few months ago, Gan et al. (2019) reported that the North American continent as a whole (180-0°, 15-60°N) “is one of the major cooling centers” in the Northern Hemisphere, with temperatures dropping after 1998 and no significant net change since the early 1980s apparent.
Image Source: Gan et al. (2019)
The contiguous United States has even undergone an overall cooling or non-warming trend – especially on the Eastern half – since 1900 (Partridge et al., 2018).
Image Source: Partridge et al., 2018
Image Source: Partridge et al., 2018
U.S. East Coast has been expanding, not shrinking, since 1960
A few months ago Armstrong and Lazarus (2019) indicated “trends in recent rates of shoreline change along the U.S. Atlantic Coast reflect an especially puzzling increase in accretion, not erosion.”
From 1830 to 1956, shorelines eroded at the rapid rate of -55 cm per year on average. Since 1960, the U.S. Atlantic coast has been expanding (accretion) at a rate of +5 cm per year.
Image Source: Armstrong and Lazarus, 2019
Twelve of 15 Florida Bay islands have also been expanding in size since the 1950s (Zhai et al., 2019).
Image Source: Zhai et al., 2019
New study: 45% of 53 long-term North America tide gauges show negative acceleration
A new paper (Boretti, 2019) utilizes 90+ years of continuous tide gauge data from the Permanent Service for Mean Sea Level (PSMSL) to record the sea-level trends from the West Coast (20) and East Coast (33) of North America.
Boretti finds the average sea-level change for the 20 West Coast tide gauges amounts to -0.38 mm/yr, whereas the average sea level rise rate is +2.22 mm/yr for the 33 East Coast gauges.
Much of the relative differences between the two coasts can be explained by land subsidence (sinking) or uplift (rising).
“Nearly the entire East Coast of the United States, from Massachusetts and parts of Maine to Florida, is known to be affected by subsidence [6–10]. Subsidence is much stronger along the East Coast of the United States and significant only in Southern California along the West Coast, and it increased in intensity since the mid-1900s.”
Image Source: Boretti, 2019
Of the 53 total tide gauges on North America’s East and West coasts, 45% (24) are negatively accelerating, 14 document falling sea levels, and just 11 have sea levels rising more than +3 mm/yr.
The overall acceleration for both the East and West coasts amounts to just +0.0028 mm/yr² and +0.0012 mm/yr², respectively, when using the late 1800s and early 1900s as the starting years.
An analysis by Houston and Dean (2011) showed that when the sea level trend begins in 1930, the U.S. coasts as a whole actually decelerated overall (-0.013 mm/yr²) during 1930-2007.
These modest trends would not appear to support the contention that modern sea-level changes in this region are rising at alarming rates.
Read more at No Tricks Zone
Rest assured, this paper will not get any Media coverage.
Doesn’t fit with the alarmist agenda, so throw it out, discredit the authors, shame those who might think this data is viable, etc.
Oh please don’t confuse things with facts . But hey maybe that’s why Obama bought waterfront . No sea level rise and this is the first we are hearing about it ?
Well i’m sure it will be a 3″ headline in the NY Times tomorrow .
It is to be noted that there is a consensus by large numbers of buyers and investment bankers who are still investing and mortgaging in expensive seaside real estate. The lenders are within the business of risk management. What do they know that the Alarmists don’t know?
Good point Alan Stewart . Maybe it’s OK if they make a bundle off flood insurance .knowing full well it’s a scam but a way to up sell more useless insurance .
Can somebody explain how 3mm of ocean level rise is measured? Is it done when the sea is so calm there is not a ripple, or maybe out of a very deep and lengthy measuring tape? Or maybe when Obama an Al Gore are out in it bathing, which would push up the level a bit ?