date: Thu Aug  4 17:03:01 2005
from: Phil Jones <p.jones@uea.ac.uk>
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
   ----------------------------------------------------------------------------
