date: Tue May 19 16:36:24 2009
from: Tim Osborn <t.osborn@uea.ac.uk>
subject: Re: TMP: cruts3 extended to 2008
to: Ian Harris <i.harris@uea.ac.uk>

   Harry -- problems occur in the latest PRE data too -- attachment again shows seasonal
   country means.  There are some big outliers here -- see Cuba on page 3!  USA on page 4 is
   particularly worrying... the last decade is all way too high.  Even though it USA is a big
   country and there are a number of years with erroneously high values, it might still be
   down to outliers (just lot's of them!).
   At 16:15 19/05/2009, Phil Jones wrote:

      Harry,
         Hope you can easily sort out the outliers. Might they be values
      where the flags say don't use? They seem like individual station
      values that you could get rid of with an outlier check.
        The Cook Islands are interesting.
      Cheers
      Phil
     At 16:03 19/05/2009, Tim Osborn wrote:

     Hi Harry and Phil,
     attached are my comparisons of last year's CRU TS 3.00 seasonal country averages through
     to end of 2005 (I didn't use the Jan2006-Jun2006 data) in pink, with the extended CRU TS
     3.00 through to end of 2008.
     I've just shown 1940-2008, otherwise things get too small to see clearly.
     There are differences throughout, but most are fairly minor.  Small differences (e.g.
     +-0.1) might be related to my calculations, which I've done at full precision but I've
     only written the final country/seasonal means out with 1 decimal place.  However it is
     likely that there are some cases that really have shifted by a small amount between the
     two Harry versions.  Any idea why early data has changed?
     A number of big outliers have also been introduced.  Some are in the update period but
     are clearly wrong.  Some are in the pre-2005 period but are not in the previous CRUTS3
     data from last year -- have you turned off any QC checking when making the new extended
     version?
     p.4  Guatemal                     SON 1995
     p.5  Greenland                    DJF 1995/6
     p.6  France/Germany/Denmark       SON 2006 (these might be real?)
     p.10 Mauritania                   SON 1994
     p.11 Ivory Coast (+p.12 Burkina.) SON 1999
     p.12 Mali/Algeria/Niger           JJA 2005
     p.12 Mail (not Algeria/Niger)     SON 1994
     p.13 Ethiopia/Eritrea/Somalia     JJA 2002
     p.14 Kenya/Tanzania               JJA 2002 (opposite sign to Ethiopia!)
     p.16 Mozambique/Zimbabwe          MAM 2004
     p.17 Madagascar                   MAM 1996
     p.23 Tuvalu/Kiribati              MAM 1997
     p.23 Tuvalu                       JJA 1947
     p.23 Tuvalu/Kiri./Marshall/Caro.) DJF 1995/6
     p.24 Tonga                        SON 1994
     I made anomaly maps for annual means for 2006, 2007 and 2008.  They looked quite similar
     to the HadCRUT3 maps on Climate Monitor.
     Cheers
     Tim
     Dr Timothy J Osborn, Academic Fellow
     Climatic Research Unit
     School of Environmental Sciences
     University of East Anglia
     Norwich  NR4 7TJ, UK
     e-mail:   t.osborn@uea.ac.uk
     phone:    +44 1603 592089
     fax:      +44 1603 507784
     web:      [1]http://www.cru.uea.ac.uk/~timo/
     sunclock: [2]http://www.cru.uea.ac.uk/~timo/sunclock.htm

     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
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