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World’s 76 Best Tide Gauges Show ‘Negligible’ Acceleration Of Sea Level Rise

by Kenneth Richard
June 21, 2019, 8:13 AM
in News and Opinion
Reading Time: 3 mins read
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sea ocean coast cloudsA new scientific paper affirms “all the long-term-trend (LTT) tide gauges of the world consistently show a negligible acceleration since the time they started recording in the late 1800s/early 1900s” and there is “no sign of climate models predicted sharply warming and accelerating sea level rise.”

An accurate determination of sea level rise acceleration trends requires at least 100 years of data due to the natural (60- to 80-year) oscillations that could bias the results depending on the start and end dates.

There are 88 world tide gauges with a record length of at least 100 years in the psmsl.org database. Of those, 76 have no data quality issues.

The average rate of sea level rise for these 76 global-scale tide gauges is just 0.337 millimeters per year (mm/yr), and the acceleration is a “negligible” 0.007 mm/yr².

Thus, the average rate of sea level rise for the world’s best long-term-trend (LTT) tide gauges amounts to about 3½ centimeters per century.

Further, the relatively high (2 to 3 mm/yr) local rates of sea level rise in the studied region (the Mexican Caribbean) were determined to be primarily associated with land subsidence.

This affirms the conclusion (Piecuch et al., 2018) that geological processes, or vertical land motions, are more influential than climate-related processes in establishing local relative sea level trends.

These results once again serve to undermine the model-based claims that the world’s seas are sharply rising and accelerating due to CO2-induced global warming.

sea level rise boretti paper

Boretti, 2019

A realistic expectation of sea level rise in the Mexican Caribbean

Because of the well-known multi-decadal natural oscillations of periodicity up to quasi-60 years (Chambers, Merrifield & Nerem, 2012; Schlesinger & Ramankutty, 1994), not less than 100 years of continuous recording in the same location and without quality issues are needed to compute rates and accelerations by linear and parabolic fittings.

However, not a single tide gauge has been operational since 1870 in the southern hemisphere, and very few tide gauges have been operational since 1870 in the northern hemisphere.

If we now take a subset of the 1269 tide gauge records of www.psmsl.org, requesting a range of not less than 100 years, there are 88 tide gauges total around the world satisfying this criterion.

If we neglect the tide gauges having quality issues, such as data originating from multiple tide gauges, misaligned data, significant gaps, there are then 76 tide gauges left.

These tide gauges have an average rate of rise 0.337, max. 6.660, min. -7.903 mm/yr., and an average acceleration 0.00700, max. 0.06090, min. -0.05560 mm/yr².

All the long-term-trend (LTT) tide gauges of the world consistently show a negligible acceleration since the time they started recording in the late 1800s/early 1900s, much less than the +0.022 mm/yr2.

Hence, the state of the oceans cannot be described as sharply warming and accelerating since 1870, as there is yet no sign of the climate models predicted sharply warming and accelerating sea level rise.

Image Source: Boretti, 2019

Apart from land motions of longer and wider scales, it is however important to measure the local vertical motion of the land in an absolute reference frame. From GPS monitoring of fixed domes nearby the tide gauge, the subsidence in Key West is comparable to the relative sea level rise.

In the nearby global positioning system (GPS) dome of CHIN, distance to tide gauge 400 m, with data 2008.91 to 2018.99, the subsidence is -3.017±2.256 mm/yr. (Blewitt, Hammond, & Kreemer, 2018).

The relative sea level, rises here, mostly because of the land sinks. On a shorter, but still long, time-frame, Peltier (1986) calculated the GIA subsidence of the Atlantic margin for the entire east coast of the United States, with specific for Florida a subsidence rate of about 1 mm/yr.

Image Source: Boretti, 2019

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Comments 3

  1. Amber says:
    6 years ago

    Whew what a relief . Malibu beach furniture is safe .

  2. Boxorox says:
    6 years ago

    3.3 cm per century rise in sea level is a good bit less than I would have expected. This equates to about 1-1/4 inches per century, also 1 foot per millennium. This rate indicates a clear overall long-term slowing of sea-level rise since the climax of the Wisconsinian Glacial Maximum 13,500-15,000 years ago. At that time, sea levels were up to 420 feet lower than they are today. Obviously, if you work the simple math, we can know that sea level increases were much higher in the past.

  3. Spurwing Plover says:
    6 years ago

    If you were to beleive all that load of pure liberal Eco-Wacko Malarkey you would think the earth was Flat and be a card carrying member of the Flat Earth Society Lunatics its no wonder their trying to silence the skeptics we standing on their Bank Accounts and Political Agenda

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