From: Phil Jones <p.jones@uea.ac.uk>
To: James Hansen <jhansen@giss.nasa.gov>
Subject: Differences in our series (GISS/HadCRUT3)
Date: Tue Jan 15 13:17:19 2008
Cc: gschmidt@giss.nasa.gov

    Jim, Gavin,
        Thanks for the summary about 2007. We're saying much the same things
    about recent temps, and probably when it comes to those idiots
    saying global warming is stopping - in some recent RC and CA threads. Gavin
    has gone to town on this with 6,7, 8 year trends etc.
       What I wanted to touch base on is the issue in this figure I
    got yesterday. This is more of the same. You both attribute the differences to
    your extrapolation over the Arctic (as does Stefan). I've gone along with
    this, but have you produced an NH series excluding the Arctic ? Do these
    agree better?
       I reviewed a paper from NCDC (Tom Smith et al) about issues with
    recent SSTs and the greater number of buoy type data since the late-90s
    (now about 70%) cf ships. The paper shows ships are very slightly warmer
    cf buoys (~0.1-0.2 for all SST). I don't think they have implemented an
    adjustment for this yet, but if done it would raise global T by about 0.1
    for the recent few years. The paper should be out in J. Climate soon.
       The HC folks are not including SST data appearing in the Arctic for regions
    where their climatology (61-90) includes years which had some sea ice. I
    take it you and NCDC are not including Arctic SST data where the
    climatology isn't correct? You get big positive anomalies if you do.
       Some day we will have to solve both these issues. Both are difficult,
    especially the latter!
    Cheers
    Phil

   At 21:39 14/01/2008, you wrote:

     To be removed from Jim Hansen's e-mail list respond with REMOVE as subject
     Discussion of 2007 GISS global temperature analysis is posted at Solar and Southern
     Oscillations
     [1]http://www.columbia.edu/~jeh1/mailings/20080114_GISTEMP.pdf
     Jim

   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
   ----------------------------------------------------------------------------

References

   1. http://www.columbia.edu/~jeh1/mailings/20080114_GISTEMP.pdf

