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GISS Adjustments Since 2008

March 6, 2016

By Paul Homewood 


Following the pause busting adjustments made by RSS, we need to keep in mind how GISS have been up to the same tricks for years.

Last year, of course, they instituted the same massive set of adjustments that NOAA had done, following Thomas Karl’s efforts. However, although these were by far the largest ones, in recent years other adjustments had been made, gradually cooling the past and warming the present.

One of the problems in trying to keep track is that, unlike RSS, they don’t archive old data. Also, because they only report anomalies, it is impossibly to identify which years have been adjusted in absolute terms.

Fortunately, bloggers have been archiving their own GISS records, and we also have the Wayback Machine, so we can piece together some of the recent alterations.


First, let’s take the GISS LOTI dataset produced for April 2008, as archived by Climate4You here, and compare with the current version here.




We see in the latest version that the past has been cooled, particularly the 1930s, and recent decades warmed.  


But let’s now take a closer look at the recent period since 1998.  

We have the pre-Karlised version from February 2015 archived in the Wayback Machine here.

If we compare this with the latest Karlised version, an extra 0.05C has been added to 2014 anomalies, when compared with 1998. The actual anomalies are shown in Appendix A, but, as an example, in the old version 2014 was 0.06C warmer than 1998, but in the new 0.11C warmer – in other words an extra 0.05C.  




   However, the Feb 2015 version had itself been adjusted in comparison with the 2008 one. We can see below that by 2007 an extra 0.01C was being added on, relative to 1998.






These may only be small amounts, but cumulatively they gradually add up, and over such a short period of time can be quite significant. 

Also we don’t know what other changes took place prior to 2008, or what 2014 would have looked like if the 2008 methodology was still being used. 

But if we add the 0.01C adjustment. made between the 2008 to 2015 versions, to the 2014 discrepancy of 0.05C, we get a total of 0.06C. This is more than half of the claimed increase from 1998 to 2014.












APPENDIX A – GISS LOTI Anomalies (Hundredths of Degree C)

Current Version 2008 Version 2015
1998 63 57 61
1999 41 33 40
2000 42 33 40
2001 54 48 53
2002 62 56 61
2003 61 55 60
2004 54 48 51
2005 68 62 66
2006 63 54 59
2007 65 57 62
2008 53 49
2009 64 59
2010 71 66
2011 59 55
2012 62 57
2013 65 60
2014 74 67
  1. PGBerkin permalink
    March 6, 2016 7:41 pm

    Karlised should be lower-case, shouldn’t it?

  2. manicbeancounter permalink
    March 6, 2016 9:09 pm

    In the first graph of adjustments between 2008 & 2016, it is not just the the cooling of the past that is evident, but reduction in the extent of the early twentieth century warming and the subsequent drop in temperatures. The early twentieth century warming cycle has been smoothed out. This may have been due to the the extension of the estimated temperature series to the South Pole. Until the late 1950s there were no permanent bases on Antarctica. It looks like the prominent cooling in the period 1880 to 1930 was due to using Base Orcadas data as a proxy, despite it being clearly different from Antarctica data post 1960.
    Another interesting feature is that the top 5% of the Earth – slightly greater than the Arctic – has estimated warming of 2C from 1885-1940, greater than the warming post 1970.

  3. March 6, 2016 9:50 pm

    thanks Paul, I’m in a debate tomorrow with a meteorologist and this post has exactly the material I was searching around for, congrats on your terrific work, I scan it every day with relish, cheers Tony >

  4. NeilC permalink
    March 7, 2016 6:18 am

    Paul, I think we can call these adjustments as man-made global warning! After all they have to keep the scam going. If raw data doesn’t match their theory, change the data, easy.

  5. 4TimesAYear permalink
    March 7, 2016 7:08 am

    Reblogged this on 4timesayear's Blog.

  6. Ben Vorlich permalink
    March 7, 2016 8:26 am

    These adjustments always make me think why does no one ask what to me is the obvious questions. Why were your previous versions* way off the mark? Why do you need to keep adjusting measurements from 70+ years ago? Is this the final adjustment or in another 5 years will today’s values be adjusted? When 2020 is claimed to be warmest ever will 2015 still be the same?

    They are reported unquestioningly by the BBC and MSM.

    *How many version have there been?

  7. March 7, 2016 3:31 pm

    Reblogged this on Climatism and commented:
    (Another) NASA / NOAA climate-fraud Must Read …

  8. April 7, 2016 11:51 pm

    Reblogged this on Climate Collections.

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