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Change in the urbanisation component of the HadCRUT3 error series

In October 2006, we corrected a bug in the error estimates for the land data component of HadCRUT3 (CRUTEM3, see here for details). This correction has had an effect on the error ranges for HadCRUT3 distributed from this website. Note that the best estimate values are unchanged, the effect of the bug was to make the error ranges slightly too big. The effect is small, barely visible in the two figures below which illustrate the difference.

HadCRUT3 global annual series with the doubled urbanisation uncertainties

HadCRUT3 global annual series with the corrected urbanisation uncertainties

If you downloaded HadCRUT3 uncertainties data from this site before October 2006, please download replacements. Note that the best-estimate data is unaffected, only the uncertainties have changed. We're sorry for this error, if you want any further information, please contact us.

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