date: Fri Jan 18 17:46:42 2008 from: Phil Jones subject: Re: Global Temperatures to: "Roger Coe" Roger, Not in the short term, because we (Jim and me) don't see the issue as high priority. There errors on the individual values. You do look at trends over the longest period to include satellite data. The Satellite data isn't the surface so doesn't have to agree. You could look at the RSS satellite series as well. Cheers Phil At 15:15 18/01/2008, you wrote: Phil, Thank you for your response, there seems to be general agreement that the Arctic temperatures are a problem. I have collated the hemispheric decadal trends over the 32 year period for the 3 main datasets as follows. Global N Hemisphere S Hemisphere HadCRUT3 0.15C 0.24C 0.13C GISTEMP 0.21C 0.31C 0.11C UAH Satellite 0.14C 0.21C 0.07C These figures also show a high value for the GISTEMP N Hemisphere, and their figure for the N polar region is 0.57C/decade. Hansen emphasises the importance of the Arctic data in determining the true global temperature and gives some indication of his methodology. Do you see any prospect of reconciling the differences which have developed between the two land based datasets,or is there a genuine difference in coverage. I was also interested in Hansen's comments on Solar Variability which suggest a bigger influence than he has previously acknowledged. He is even interested in solar cycle 24. Regards Roger. 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 ----------------------------------------------------------------------------