NASA GISS – Adjusting the Adjustments

nasa_us_adjustmentsBy Steve McIntyre

I don’t feel hugely energetic right now in terms of writing anything very complicated. As a simple exercise, I decided to quickly revisit the everchanging Hansen adjustments, a topic commented on acidly by E.M. Smith (Chiefio) in many posts – also see his interesting comments in the thread at a guest post at Anthony‘s, a post which revisited the race between 1934 and 1998 – an issue first raised at Climate Audit in 2007 in connection with Hansen’s Y2K error.

As CA readers recall, Hansen’s Y2K error resulted in a reduction of US temperatures after 2000 relative to earlier values. The change from previous values is shown in red in the graphic below; the figure also shows (black) remarkable re-writing of past history since August 2007 – a rewriting of history that has increased the 2000-6 relative to the 1930s by about 0.3 deg C.

This impacts comparisons made in 2007 between GISS and CRN1-2 stations. At the time, it was noted that GISS adjustments for UHI resulted in the GISS US temperature anomaly having quite a bit in common with a TOBS average from Anthony’s CRN1-2 stations. Critics of Anthony’s surfacestations.org project commented on this rather smugly – too smugly given the large differences with NOAA and CRU versions in the US and the incoherence of Hansen’s adjustments outside the US. The post-2007 adjustments to GISS adjustments change this. The increased trend in the GISS US statistic comes at the expense of reconciliation with CRN1-2 stations: the trends no longer cohere.

Read the rest at Climate Audit.

77 Responses to NASA GISS – Adjusting the Adjustments

  1. paul wenum February 2, 2011 at 7:47 pm #

    Have been known to have many jobs, occupations. To be blunt, if I wished, I could find you. It would not be hard at all and this will probably be deleted.

  2. Rob N. Hood February 8, 2011 at 11:58 am #

    Is that some kind of weird threat? Why does the Right always do that? You aren’t violent at all are you? You are so loving, and level-headed. So mature….

    NOT

  3. paul wenum February 8, 2011 at 6:37 pm #

    There is no threat, veiled or otherwise. Simply a factual statement. In my business we find people as well as other duties thereafter. Don’t worry about it. Favor and humor me and others on this site with your posts, factual or made up.

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