The UK Meteorological Office released what it described as temperature data for over a century and a half from more than 1500 land weather stations throughout the world
, along with what the Met Office described as the code used to plot temperature trends for the time frame in question. But the data are apparently not the raw data, and questions remain as to the validity of the adjustment of the data, an inconsistency in reporting a lack of valid temperature measurements in one year, and the accuracy of the source code.
The Met Office states that the land station records, going back to 1850, came from the East Anglia Climatic Research Unit (CRU). This has long been the understanding of the genesis of the HadCRUT dataset: the CRU collected land station data, and the Hadley Centre collected temperatures from ships at sea.
John Graham-Cummings was the first person to take note of the release
, and to examine the source code for accuracy. Within hours, Graham-Cummings had found two possible errors
. First, he found an apparent error in the code that caused the program to use suspect data in its data plots. Graham-Cummings introduced a quick correction to the code, and was able to produce a trend line similar to the official version
, with this difference: the data point for the year 1855 is missing, and this gap in the data is not shown on the official version.
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Source Link: examiner.com