Email 2947, June 2004, Phil Jones: "some data we've received have probably had adjustments applied but we don't know when or by how much, then there are adjustments we've applied in the mid-1980s (which we know about), then there are your adjustments"

Email 2947

CRU will be doing some work soon with the Hadley Centre, which will eventually lead to a new version of the CRU land and marine temperature dataset. In the last version which was described in Jones and Moberg (2003) we used your corrected/adjusted temperature series for Canada and Austria you kindly sent us. This time, with the new version (in addition to adding some more data we've received from elsewhere), we wish to assess the errors more (following from the paper in J. Climate in 1997, Jones et al.). To achieve this, we want to incorporate the additional uncertainty of the adjustments that have been applied. This is difficult, as some data we've received have probably had adjustments applied but we don't know when or by how much, then there are adjustments we've applied in the mid-1980s (which we know about), then there are your adjustments. To cut a long email short, we are hoping you will be able to send us files with your adjustments in.