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Spot The Sea Ice Years

February 9, 2015

By Paul Homewood 



Jan P Perlwitz says: 


And while I’m at it. Why do I still see those “ice years” or the mentioned very cold years around 1980 in the data, compared to the 1940/50ies, also after the adjustments?


These are the adjusted graphs he is referring to:







The sea ice years were from 1965 to 1971, according to the Iceland Met Office. According to GISS, temperatures during this time were similar to or higher than many years in the previous three decades.


HH Lamb had this to say about these years, in “Climate, History & The Modern World”:


The cooling of the Arctic since 1950-60 [bear in mind the book was published in 1982] has been most marked in the very same regions which experienced the strongest warming in the earlier decades of the 20thC, namely the central Arctic and northernmost parts of the two great continents remote from the world’s oceans, but also in the Norwegian-East Greenland Sea….

A greatly increased flow of the cold East Greenland Current has in several years (especially 1968 and 1969, but also 1965, 1975 and 1979) brought more Arctic sea ice to the coasts of Iceland than for fifty years. In April-May 1968 and 1969, the island was half surrounded by ice, as had not occurred since 1888.

Such sea ice years have always been dreaded in Iceland’s history because of the depression of summer temperatures and the effects on farm production….. The 1960’s also saw the abandonment of attempts at grain growing in Iceland, which had been resumed in the warmer decades of this century after a lapse of some hundreds of years…


Lamb’s account tallies with the original temperature data.






But Jan P prefers the evidence of his algorithm!  

  1. Green Sand permalink
    February 9, 2015 9:07 pm

    Paul, you may find the following of interest:-

    “Sea ice incidents in Icelandic waters and their monitoring” by Thor Edward Jakobsson

    Sadly the graphics leave a bit to be desired.

  2. Don permalink
    February 10, 2015 3:40 am

    Great stuff. The history of Iceland in opposition to algorithms of “homogenized” temperatures.

  3. February 11, 2015 6:37 pm

    For any curious who haven’t already checked: sheep numbers may not be a good proxy for T; see figure 12:—Conditions-and-Characteristics.pdf
    Maybe there was too much ice for export (joke). –AGF

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