RUTI : Greenland Iceland and Svalbard

Fig1: Greenland. As for Scandinavia, blue stars indicates GHCN temperature stations and Green stars indicates Nordklim Stations. There is a good agreement in general between GHCN (and also Hadcrut) vs. Nordklim for Greenland, Iceland and Svalbard - just as we saw it for Scandinavia.

Fig 2. No doubt Greenland has been warmer than today in historc times, here wood samples that can be found today on the hill sides in the Scoresbysun area (origin around year 1000). We are very far from such warm conditions today, but as seen in RUTI in many places of the world, the previous warm peak 1925-45 is rather similar to the present warm peak.

Fig3. Using Appinsys i got the above temperature trend by making a raw average of unadjusted GHCN data.

I then divided Greenland into 3 areas West Greenland, East Greenland And South-East Greenland, see fig1, and added the Nordklim data sets. (When I have both GHCN and Nordklim data for a station i used the prolonged stitched graph)

West Greenland:

Far most stations for the West Greenland area are located in a smaller area in the south, there fore when making a raw average for West Greenland, the Northern temperatre series was weighted 2 times in calculation.

East Greenland

Fig5. The Svalbard station is not used for calculating average, just for compare.


South East Greenland

Fig6. Nice to work with data so "robust".


Overall Greenland

Fig7. Until 2010, the recent warm period had not produced a warmer Greenland than seen in the 1925-45 warm peak. In Fig 7 we see a rather fair agreement between the 3 parts of Greenland. The black curve is a raw average (for now) of the 3 regions. The white curve is a 10-year averages graph. When including the very warm year 2010, only then did the 10 year average curve exceed the previous wam peak 1925.45.

I think that it is fair to say that the recent warm peak in Greenland is similar to the warm peak 1925.45, except for an extraordinary warm year 2010. Also, it is fair to mentionm that before 2002, temperatures where much colder on Greenland than in the 1925-45 period.

Fig 8. The shorter duration of the recent warm period shows more clearly when applying a 20-year average curve. So all in all, even after including the very warm year 2010, the present warm peak still has to produce several warm years on Greenland to be stronger than seen just 70 years ago.



Fig9. For Iceland, the temperature stations given by Nordklim does not add any years to the data already available from GHCN, on the contrary, there is substantially more data available from GHCN´s unadjusted catalogue:



Fig11. Unadjusted GHCN data from the 8 available stations of Iceland has the above average.

When splitting up east and west iceland, it appears that Western Iceland has larger warn peak around 1925-45 than Eastern Iceland:

As often seen in GHCN data, warm peaks are missing in some data graphs, but still, the difference east-west Is rather significant.

The Akkureyri station

Fig13. Only one single station available from GHCN (or any other source I have seen) is not located on the Atlantic coast, and this station is Akkureyri. The Iclandic Coastal stations are likely to be affected by ocean temperatures, and therefore it is not surpricing if the Akkureyri station shows some trends a little different from the other státions.

The question is obviously if in fact the Akkureyri station as only non-coastal station gives a hint of temperatures of the bulk of central Iceland temperature trends? Hard to say. But for sure, the Akkureyri station is important. This is why its sad to see that this station has been adjusted exactly in the years of the warm peak by Hadcrut, just as seen all over the world:

Fig14. What is much more unusual (!) is, that the Akkureyri data still present and available in unadjusted GHCN data does no longer match the present Nordklim version. DMI has sent data to Nordklim, but this time they sent another version than they sent originally to GHCN – or so it seems. DMI´s role in the available Danish temperature data is discussed in “RUTI Scandinavia” – a stunningly odd choice of stations where – like Iceland – the bulk of the inland is not represented.


Fig 15. Svalbard Luftavn combined from Nordklim and GHCN. 




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