date: Thu Aug 4 17:03:01 2005 from: Phil Jones subject: Re: First Tmax dataset to: Adrian.Simmons@ecmwf.int Adrian, Great ! Thanks in advance. Phil At 16:48 04/08/2005, you wrote: Phil It's pretty straightforward - may be able to do it tomorrow afternoon. Adrian Phil Jones wrote: Adrian, Is it a trivial exercise for you to work a trend from land regions of DTR (annual) for 1979-2001? I'm just after a number. Does ERA-40 have DTR still going down? CRU mask not essential. Omit Antarctica. If it isn't trivial then don't bother. Cheers Phil At 17:04 03/08/2005, Adrian Simmons wrote: Phil, Russell As promised earlier, attached is the first of the datasets. It is the set of monhtly-averages of the daily maximum two-metre temperature, computed from the four 0-6h forecasts per day carried out from the ERA-40 analyses. Once you have run gunzip on the dataset, you should be left with a simple character file, suitable for a formatted read into a FORTRAN program. Looking at the file with any editor, you should see a sequence comprising a month identifier (format is I4,I2) showing YYYYMM and then the field itself. Each row (format 72f7.2) contains the temperature in Kelvin for grid boxes running east from the dateline, ie for longitudes 180W-175W, 175W-170W, 170W-165W,..., 175E-180E, as in the CRUTEM2V dataset downloadable from the CRU website. There are 36 rows running from north to south, ie for latitudes 90N-85N, 85N-80N,80N-75N,...,85S-90S. The months run from 1958 1 to 200112. If you can read the data without problem, I'll send the corresponding monthly-average minimum temperatures computed the same way, and the alternative monthly averages of the max/min temperatures computed each day from the 00, 06, 12 and 18UTC analyses. I'll send one field per email to avoid hitting possible mailbox limits. Best regards Adrian -- -------------------------------------------------- Adrian Simmons Head of Data Division European Centre for Medium-Range Weather Forecasts Shinfield Park, Reading, RG2 9AX, UK Phone: +44 118 949 9700 Fax: +44 118 986 9450 -------------------------------------------------- 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 ---------------------------------------------------------------------------- -- -------------------------------------------------- Adrian Simmons Head of Data Division European Centre for Medium-Range Weather Forecasts Shinfield Park, Reading, RG2 9AX, UK Phone: +44 118 949 9700 Fax: +44 118 986 9450 -------------------------------------------------- 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 ----------------------------------------------------------------------------