Boretti, 2019 examined
90+ years of continuous
tide gauge data from
the Permanent Service
for Mean Sea Level (PSMSL) .
They examined
sea level trends
from the West Coast
(20 gauges)
and East Coast
(33 gauges)
of North America,
for a total of
53 tide gauges.
A typical tide gauge
record is shown below:
Of 53 tide gauges
on North America’s
East and West coasts,
45% (24) were decelerating
( negatively accelerating ),
14 had falling sea levels,
and just 11 had sea levels
rising more than +3 mm/yr
The data reflect
very modest trends,
that do NOT support
climate alarmist claims
that sea levels are rising
at alarming rates.
For the 20
West Coast
tide gauges,
the average sea
level change
is negative
-0.38 mm/yr.
For the 33
East Coast
tide gauges,
while the average
sea level rise
is +2.22 mm/yr.
Much of the difference
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.
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.”
Overall acceleration
for both the East
and West coasts
amounts to a very tiny
+0.0028 mm/yr²,
and +0.0012 mm/yr²,
respectively,
when using the
late 1800s and
early 1900s as
the starting years.
