Originally posted on Watts Up With That?:

People send me stuff. Here we have another case of value added adjustments that increase the slope, much like temperature.

This email forwarded from Steve Case reads as follows:

The University of Colorado’s Sea Level Research Group just published the 2013 Release #1 of their Global Mean Sea Level Time Series.


I discovered that these periodic releases are on the net all the  way back to 2011 Release #1. So I downloaded all nine of them.

2012 release #1 has 628 entries up to January of 2011 so I had Excel’s slope function calculate  the rate of sea level rise for that time series of 628 entries across all nine releases.

What I found is that the rate of sea level rise has been bumped up twice since then, once in 2011 and the the latest in the current release.  Here’s a link to a graph  to illustrate the point:

View original 70 more words

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3 Responses to

  1. stacase says:

    Thanks for re-posting my epistle.

    Actually there’s more. The internet wayback machine
    Has old pages for Colorado University’s Sea Level Research Group all the way back to 2004
    which shows a rate of 2.8 mm/yr. If you download the earliest link from above
    which is 2011 release #1 into Excel, you can use the slope function to find out what CU said the rate from 1992 – 2004 was then. And it turns out to be 3.5 mm/yr. Well, there’s 0.3 mm/yr of GIA in that so it’s really only 3.2 mm/yr and the difference is 0.4 mm/yr. So it can all be summed up, 0.4 mm/yr plus the 0.13 mm/yr from above and the GIA adjustment of 0.3 mm/yr. So it’s about 0.8 mm/yr that’s been added in over the last few years.


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