This post follows up on the hornet’s nest stirred by Paul Homewood and Christopher Booker and my recent post on Temperature Adjustments in Australia comparing raw temperature records (GHCN V2) with homogenised (adjusted) temperature records (GHCN v3.1). The latter is currently used by NASA GISS and NOAA in global temperature reconstructions.
In this post I examine the records of eight climate stations on Iceland and find the following:
- There is wholesale over writing and adjustment of raw temperature records, especially pre-1970 with an overwhelming tendency to cool the past that makes the present appear to be anomalously warm.
- In the 1960s, Iceland (and the whole N Atlantic) experienced a run of very cold years caused by extreme atmospheric pressure differentials linked to the North Atlantic Oscillation (NAO). Many of these cold records appear to have been systematically deleted in V3.1 with the effect of all but removing this well-documented event from Icelandic climate history.
- Following the end of the Little Ice Age, Iceland experienced rapid warming in the 1920s reaching near “record warmth” in 1939. This near record warmth has also been written out of Icelandic climatic history by adjusting the temperature records down, leaving the false impression that 2003 was an anomalously warm year.
- In addition to wide-spread deletion of records, large amounts of temperature data that does not exist in V2 appears to have been created in V3.1. It is difficult to understand why this should be done since it is quite straight forward to manipulate data without apparently having to make it up.
No comments:
Post a Comment