date: Thu Sep 2 15:53:19 2004 from: Phil Jones subject: Re: Notes from Friday to: "Brohan, Philip" Philip, I'll look at these tomorrow. Have forwarded to Harry. His email is i.harris@uea.ac.uk . Cheers Phil At 14:50 02/09/2004, you wrote: Hi Phil. It was good to talk to you on Friday, and to hear that the HadCRUT3 work is starting. As promised, my notes from the meeting are below. Regards, Philip The CRU contract is nearly signed off. Phil realised that another person had to sign it, and this is being done. We have been sending our correspondence to the wrong address, it is going, correctly, to Alicia Meldrum, but she is at the University Registry, not at CRU. Phil has added some new data to the Jones file, mostly from Antarctica, through the READER project at BAS. Harry has also started work, he is merging in some new data for Mali and for the Congo (ex Zaire). Harry is also digitalising the old records of corrections applied at CRU. Phil has obtained lists of corrections from Canada and corrected and uncorrected data (do-it-yourself correction lists) from both Austria and Switzerland. We will use this to calculate statistics on the frequency and magnitude of corrections. Harry is also planning to go through the data looking for outliers (values more than 5-10C from what they should be) by comparison with climatology and re-analyses. We will collect statistics on these as well. We need to use these data to estimate the frequency of smaller transcription errors (~ 1C); we are not yet sure exactly how to do this. We discussed the climatology uncertainties. Only about 10% of the stations don't have a good climatology; in these cases climatologies are constructed from pre 1961-90 data and corrected to the 1961-90 period by comparison with nearby stations with more data. We can estimate the uncertainties by making similar estimates for stations which do have 1961-90 climatologies, and looking at the differences. To extend the Folland et al. 2001 treatment of urbanisation uncertainty from global to regional scales we need a spatially and temporally resolved urbanisation dataset. Phil suggested I contact Tom Peterson at NCDC and ask about their night-lights dataset. (I should read his paper in J. Clim first (vol 16 no. 18 pp2941-59)). Phil gave me some information on the header formats in his station data files. I will add this information to our system documentation. I will get in touch with Harry (i.harris@uea.ac.uk). He should probably come to Exeter in a month or so. -- Philip Brohan, Climate Scientist Met Office Hadley Centre for Climate Prediction and Research Tel: +44 (0)1392 884574 Fax: +44 (0)1392 885681 Email: philip.brohan@metoffice.com [1]http://www.metoffice.com 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 ----------------------------------------------------------------------------