Tide Gauges « JoNova

Sea Level scare industry urges plans to panic and evacuate over 1mm rise

Please, sell us your low lying land

Let’s play sea level bingo with the latest advertising from the Merchants of Sea-level Scares.

Hitting the media outlets tonight — the latest “Prepare to Die” news stories claim we must plan now for evacuees, refugees, inundation and homeless koalas. All the usual features of marketing are there — firstly all the images they use are from mocked up futuristic sea level rise. Secondly, it’s not a continuation of current trends, it a sudden acceleration — in this case from 1mm to year to 9mm a year, effectively starting tomorrow.

1 tiny millimeter

From 1969 – 2013 the seas have not changed the beaches around these Tuamotu atolls — or almost any other atoll you can name.

By every method known to man, seas are rising around 1mm a year:

1,000 tide gauges, hundreds of studies of beaches, satellites measuring sea levels, and satellites measuring beaches.

All anyone needs to know about sea levels is that for the last 50 years sea levels have been rising at 1mm a year as shown by a thousand tide gauges all over the world. There was no acceleration. (Beenstock et al). Some of those gauges […]

It wasn’t CO2: Global sea levels started rising before 1800

Fans of man-made global warming frequently tell us seas are rising, but somehow forget to mention the rise started 200 years ago, long before our coal-fired electricity plants cranked up, and long before anyone had an electric shaver, or a 6 cylinder fossil-fuel-spewing engine. Something else was driving that warming trend.

Here is the data from tide gauges going back 300 years from a paper by Jevrejeva et al 2008.

[Graphed by Joanne Nova based on data from Jevrejura et al located at this site PMSML]

This graph was calculated from 1023 tide gauge records [Jevrejeva et al., 2006] going back to 1850.The 2008 study extended the record further using three of the longest (though discontinuous) tide gauge records available: Amsterdam, since 1700 [Van Veen, 1945], Liverpool, since 1768 [Woodworth, 1999] and Stockholm, since 1774 [Ekman, 1988]. Obviously since there are only three old records, the error bars are a riot.

The Jevrejeva paper is also useful for portraying the 60 year rolling cycle. The regular ups and downs are obvious when the rate of change is plotted (see below).

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