From	Phil Jones	Date	Mon Apr 4 09:50:24 2005
To	Brohan, Philip
CC	Peter Thorne
Subject	Re: HADCRUT various
Philip, I'm not unhappy at all. If I am it is more about HadCRUT2 and 3. I read through the report to DEFRA and will be sending some comments later today. I also commented on what Harry has written as a report for you. I've left those comments with him as he's away this week and I'm off April 6-15. It is a bit odd with HadCRUT2 that the problem has surfaced now and my old mask hasn't made any difference. Cheers Phil At 15:33 01/04/2005, Brohan, Philip wrote: Phil. I've just had a chat with Peter Thorne about HadCRUT2 and 3, and I get the impression that you are concerned, so we thought I should clarify what is going on. In particular I want to assure you that we are not trying to change the system without your approval. To make things quite clear, we have two HadCRUT systems here: 1) Peter is running HadCRUT2. This is our operational system which produces the new data every month that we send to you and everyone. This is a fixed system, it does exactly what you agreed with Peter a couple of years ago. We don't plan to change it at all. We did, unfortunately, make a mistake while running the system; we think a land-mask file was changed. This is what Peter's recent messages have been about. We're still not quite sure how this happened, but whatever fix we apply will be to restore the system to the original, agreed state. 2) I am coordinating HadCRUT3. This currently encompasses Harry's work on the data, Simon's work on blending, John Kennedy's work on variance correction, and my work on errors and gridding. Some combination of this work will become the new dataset. I have a clear picture of what I think should form the new dataset. However, we won't produce HadCRUT3 unless you (and all the other contributors) agree. If I can't persuade you of the value of a change, it won't happen. In particular, I see the land station data as entirely under your control, both now and in the future. If I (or Peter) misread the vibes and you were not worrying about any of this, please don't start. There are not serious problems with either system. Have fun, Philip. Prof. Phil Jones Climatic Research Unit Telephone +44 (0) 1603 592090 School of Environmental Sciences Fax +44 (0) 1603 507784 University of East Anglia Norwich Email p.jones@uea.ac.uk NR4 7TJ UK ----------------------------------------------------------------------------