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Comparing Arctic Temperature Trends

February 8, 2015

By Paul Homewood  


A bit more background to the Arctic temperature adjustments.

To recap, the sudden climatic shift to much lower temperatures in the 1960’s, known in Iceland as the sea ice years, has caused the algorithm to adjust previous temperatures down, on the assumption that they were due to observation or equipment changes.


I have plotted the original the original temperature data for three stations, Nuuk (Greenland), Akureyri (Iceland) and Jan Mayen Island (Norway). The temperatures are shown as anomalies from a 1951-80 baseline.




All three stations show the same sharp decline around this time, though, interestingly, Jan Mayen precedes Akureyri, which in turn comes slightly earlier than Nuuk.



The stations come under three jurisdictions and lie at least a thousand miles apart. Clearly these abrupt changes were climatic in nature, and not the result of local, non-climatic factors.

  1. February 8, 2015 3:48 pm

    “The original “

  2. February 8, 2015 4:05 pm

    Perhaps some academic could apply for a grant to reseach these ‘corrections’ / ‘interferences’ with historic data?

    • victorerimita permalink
      February 8, 2015 11:30 pm

      Who would fund such a grant? The government? Universities receiving government money? Environmental foundations? You must be kdding.

  3. Mikky permalink
    February 8, 2015 5:17 pm

    The GISS website is pretty dreadful from a scientific point of view, they don’t specify precisely what the data is that can be downloaded (hint: put this info in a header), they provide only MEAN temperatures (which I’m guessing is the average of MIN and MAX, but why should I have to guess?) (hint: provide MIN and MAX data separately), and they only plot “conventional” annual averages (hint: plot 12-month moving averages of monthly data, stepping forward by 1 month, not 1 year).

    Plotting these 12-month moving averages for the Paraguay data shows that all the major changes in temperature occurred at the same time across all stations, very likely to be genuine climatic changes rather than inhomogeneities.

  4. Bill Illis permalink
    February 8, 2015 5:23 pm

    The interesting ones from Arctic Canada are York Factory (starting in 1774) and Churchill (1885).

    And then Miceal O’Ronain compiled this comparison on John Daly’s site of Tim Ball’s reconstruction of these very early Royal Society and Hudson Bay Company efforts of measuring temperature at these two site.

    Churchill’s most recent two years would be in the -7.0C range on the above chart after being in the -5.0Cs from 2002 to 2012.


  1. Sunday is warmest day of 2015 in Washington -

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