Iceland’s Sea Ice Years Adjusted Away
By Paul Homewood
One further thing to add to Tony Heller’s post about the Icelandic temperature adjustments.
In January 2012, Trausti Jonsson emailed this to me:
In 1965 there was a real and very sudden climatic change in Iceland (deterioration). It was larger in the north than in the south and affected both the agriculture and fishing – and therefore also the whole of society with soaring unemployment rates and a 50% devaluation of the local currency. In the questions above the year 1965 is mentioned twice. It is very sad if this significant climatic change is being interpreted as an observation error and adjusted out of existence.
I have been working for more than 25 years in the field of historical climatology and have been guilty of eager overadjustments in the past as well as other data handling crimes. But as I have lived through these sudden large climatic shifts I know that they are very real.
I might issue an "official" statement but you can refer/use the answers above as you like.
Yet when we look at the adjustments made by GHCN, we find this is exactly what they have done:
We can see this more clearly if we focus in on Akureyri (see graph below). Note the sharp drop in temperatures between 1964 and 1966, on the top graph of unadjusted temperatures (red). This is what Trausti was referring to, and it was a real climatic event.
Temperatures went lower than they had been since the early 1920s.
Yet after adjustment the is no more than a small drop in temperatures, which appear no different to many other years in the 1940s and 50s.
The net effect of these adjustments is to downgrade the warm years of the 1930s and 40s, which is also helped by an extra batch of adjustments around 1940.
For some reason, Trausti now feels these adjustments are justified, and that presumably the sea ice years never happened.