Temperature Adjustments Around The World
By Paul Homewood
As well as the well documented adjustments to past temperatures in Paraguay, it is worth remembering just how widespread this practice is.
None of these are isolated instances, and there are other similar adjustments at other stations in these countries. You might also note that these are all long running and complete, or near complete, records.
It is often claimed that these adjustments are needed to “correct” errors in the historic record, or compensate for station moves. All of which makes the adjustment at Valentia Observatory even more nonsensical.
Valentia Observatory, situated in SW Ireland, is regarded as one of the highest quality meteorological stations in the world, located at the same site since 1892, well away from any urban or other non climatic biases. The Irish Met Office say this:-
Since the setting up of the Irish Meteorological Service, the work programme of the Observatory has greatly expanded and it has always been equipped with the most technologically advanced equipment and instrumentation. The Observatory is well known and very highly regarded by the scientific community. As well as fulfilling its national and international role within Met Éireann it is involved in many projects with other scientific bodies both in Ireland and abroad.
If we cannot get accurate temperature trends in Valentia, we cannot get them anywhere. Yet the GHCN algorithm decides that the actual temperatures measured there do not look right, and lops 0.4C off temperatures before 1967.
Worse still, the algorithm uses a bunch of hopelessly unreliable urban sites, as far away as Paris, to decide upon the “correct temperature”, as Ronan Connolly illustrated.
If you wanted to find a way to fraudulently alter the global temperature record upwards, you would be hard put to find a better way than this.
Note that this post can be found under the “Temperature Adjustments” tag, for future reference.
Raw data from GISS, up to 2011.
Adjusted data (GHCN V3)