Wednesday, October 30, 2013

Satellite sea level data has been "adjusted" upward by 34% over past 9 years alone

There are many documented examples of sea level data from satellite altimeters being "adjusted" upward many years after publication, often repeatedly on the same data, and in defiance of the laws of probability, always in an upward direction. Seven documented examples can be found in the links in this post. A recent comment in a sea level article on the Yale Environment 360 site documents another example of sea level data being adjusted upward by 34% [by 1 mm/yr, equivalent to an additional 4 inches per century] over the 9 years since it was collected and published on the University of Colorado website. 

Data published on U of Colorado website in 2004 shown in blue. Same data after 9 years of adjustments published on same website today shown in red. The slope of the same 1992-2004 data has somehow increased by 34% over the past 9 years. 
H/T: Based upon the comment by Steve Case in this article:
Here's an interesting presentation by Dr. R. Steve Nerem, who is well quoted in the article:
"Why has an acceleration of sea level rise not been observed during the altimeter era?" R. Steven Nerem (University of Colorado)

Here's the link:\%203\%20SCI/04\%20Nerem\%20ostst_2011_nerem.pdf

One has to wonder what all the excitement is about if for the last twenty years there has been no acceleration of the rate. Couple that with the fact that it's rather easy to determine that there's been a good deal of inflating the rate of sea level rise by those same CU Sea Level Research Group scientists.

Simply put the URL of their home page ( into the Internet WayBack Machine ( and see for yourself.

This archived time line:
( differs from the current one:
in a rather interesting fashion. Changes have been made to the data resulting in an increase in the rate of reported sea level rise by nearly a millimeter per year.

Also see my comments on the same article:
Sea levels have been rising naturally for the past 20,000 years and at much, much faster rates in the past (up to 40 times faster than today). 

Sea levels are currently rising 4 to 8 inches per century, and there is no acceleration, which means there is no evidence of a human influence on sea levels: 

References finding no acceleration: 
JM Gregory et al Journal of Climate 2012, M Beenstock et al 2013, NOAA 2005-2012 Sea Level Budget, Dean & Houston 2011 & 2013, Scafetta 2013, Holgate 2007, Boretti 2012, Morner 2004, Jevrejeva et al., 2006 & 2008, W√∂ppelmann et al., 2009 

IPCC 2007: 
"no long-term acceleration of sea level has been identified using 20th-century data alone." 

IPCC 2013: 
"It is likely that GMSL (Global Mean Sea Level) rose between 1920 and 1950 at a rate comparable to that observed between 1993 and 2010" 

Sea level rise is a local, not global, phenomenon: 
...the authors find that sea level rise is a localized rather than global phenomenon, with 61 percent of tide gauge records demonstrating no change in sea levels, 4 percent showing a decrease, and a minority of 35 percent showing a rise. This implies relative sea level change is primarily related to subsidence or post-glacial rebound (land height changes) rather than melting ice or steric sea level changes (thermal expansion from warming).

Posted by Hockey Schtick on 25 Oct 2013

Please explain why sea levels during the last interglacial were 31 feet higher than the present, and Greenland 8 degrees C warmer than the present, without anthropogenic forcing. 

What evidence suggests the current interglacial is any different?


  1. Replies
    1. I like it - will add to the climate science dictionary

  2. Thanks for reposting my comment.

    Another area to look at is the Church & White papers on sea level. These two researchers carefully selected around 500 or so of the over 1200 tide gauges in the PSMSL. At this link
    You can find a list of the tide gauges they used here
    (zipfile, 21,008 bytes)

    If you compare the 500 gauges used against the 700 tide gauges discarded, I did it on 30° grids, you will find that the Church and White selected data yields a rate of sea level rise of 2.4 mm/yr and the discarded data results in 1.2 mm/yr. Here's a graph
    of that comparison that I made some time ago. Church & White go on to somehow adjust the data to match the 3.2 mm/yr reported by Colorado University.

    1. Thank you Steve, that's very interesting as well. The 1.2 mm/yr is essentially the same as the NOAA 2005-2012 sea level budget rate of 1.1.-1.3 mm/yr.


  4. more on adjustments to altimetry, sea levels: