date: Tue Aug 3 14:54:50 2004 from: Phil Jones subject: Fwd: Re: Corrections applied to monthly temperature averages to: i.harris@uea.ac.uk Harry, This is the other attachment that Reinhard is referring to. Probably not relevant. Phil From: "Reinhard Boehm" To: "Phil Jones" Subject: Re: Corrections applied to monthly temperature averages Date: Mon, 2 Aug 2004 14:45:23 +0200 X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-UEA-MailScanner-Information: Please contact the ISP for more information X-UEA-MailScanner: Found to be clean X-UEA-MailScanner-SpamScore: s Hi Phil, Back from Utrecht and from a holiday stay in the Austrian mountains, I try to work off all requests in my mailbox. Yours is among the older ones and I hope to be able send You everything soon. There is one thing that would help me: Could You please send me the list of stations with the exact locations (I remember that in Austria for example there were some which we adjusted from a HISTALP location to a CRU location, as for example Innsbruck from the university site to the airport site). As I have lost the respective mails with Anders Moberg that would explain everything, I need that information. The best thing would be to receive from You a list of CRU-sites from the GAR plus the recent 10 years or so of data and we wil immediately send You the respective HISTALP-data plus the changes we have applied separated for ajusted breaks, for outliers and for completed values that were missing in the original data. To give You a first impression of the new HISTALP temperature release (which will be on the ALP-IMP homepage within a few days) I have attached the accompanying readme-file. There have been several smaller and some severe changes also concerning the Austrian series we have sent to Anders last year, so I suggest to exchange the whole series in Your dataset. One of the changes makes life easier for You for future updating: we have recalculated all Austrian series from the 24-hourly means to the recent mean calculation that is used also in the CLIMAT-telegrams (Tm = T7+T19+Tmin+Tmax)/4, the non Austrian series have ben already according to their way of calculating the means (Tmax+Tmin)/2 for Italy for example... Looking forward to Your reply Reinhard P.S.: Keith was telling me in Utrecht about "doing soon" the final language correction of the IJC-precipitation draft. Could You be so kind to remind him of that? Thanks ----- Original Message ----- From: [1]Phil Jones To: [2]Reinhard Boehm Cc: [3]ingeborg.auer@zamg.ac.at ; [4]Wolfgang Schoener Sent: Monday, July 05, 2004 12:48 PM Subject: Re: Corrections applied to monthly temperature averages Reinhard, I know you're in Utrecht. The HISTALP file you mention sounds good. If we can get that and the updated Austrian series we can add them to the CRU data base. Also the adjustment factors will be useful as well. We are only looking at the homogeneity adjustments and not the outlier numbers. An idea of the numbers of real outliers would be a useful number though. I see you have sent that in the ALP-IMP email. Cheers Phil At 15:27 23/06/2004 +0200, Reinhard Boehm wrote: Phil, Sorry for being late, but at the moment we are really busy with 90% mad administrative rubbish. So the general answer for today is a clear YES. You will receive the Austrian temperature series plus plus what has been adjusted within 2 weeks. The reason why not immediately: We are just finishing the final and systematic temperature outlier testing and removing. T hrough the much more systematic and intensive work we perform now versus the old version we sent to Anders there are a number of new detected and removed outliers plus a re-homogenisation (same breakpoints) but smoothed annual variation of adjustments For the Vienna series we found a more reliable new original dataset for pre-1852 So we really propose to exchange once more the time series from 2 years ago versus the new version of June/July 2004 we will send You as soon as theiy are ready One last suggestion: Why not using also some other series out of the new HISTALP-dataset. We have for each of them a complete adjustment and outlier statistics, they will be updated until 2003-12 and we are convinced that the work we have invested into them has produced something of a quite high quality level. (for example we have detected and removed some 2000 outliers for the first 120 years we have treated so far, and some of them are among the absolute extremes!) Cheers Reinhard P.S.: Is somebody of You present at Utrech this July? (Keith I suppose) I would be pleased if we could have some short personal discussion about the next publications ----- Original Message ----- From: [5]Phil Jones To: [6]Lucie.Vincent@ec.gc.ca ; [7]Reinhard Boehm Sent: Wednesday, June 16, 2004 2:54 PM Subject: Corrections applied to monthly temperature averages Dear Lucie and Reinhard, 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. These need only be for the stations you've sent us in 2002 (for Canada 200+ and for Austria about 10). What we'd like is the monthly adjustment factors for each change at each station and the period over which the adjustments apply. This could be none for some stations. Do you have such a file - or can one be easily produced? One final question, do you have information on the periods of overlap you used to assess the adjustments. This might be for example, the exact periods used or a number of years (e.g. 20) used as a sort of average overlap. We hope to use this information as a guide to other parts of the developed world, Austria for Europe and Canada for North America and maybe Australia. Thanks for any help you can give me. Cheers Phil PS I will be away from June 23 until July 7 inclusive as I'm moving house - just 2km, but still everything needs to be packed and then unpacked. 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 ---------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------