cc: c.goodess@uea.ac.uk date: Wed Jan 23 10:50:42 2008 from: Phil Jones subject: The paper I was talking about to: "Jake Hacker" Jake, This paper is still in draft form, but I will submit soon. It is mostly about China, so ignore that. What is relevant is the parts about London and Vienna at the beginning - and Figures 1-3 and Tables 1-2. Bottom line is that central London does have a UHI of about 1.5 deg C. This however doesn't change over the last 45 years. The rate of warming at all the London sites is the same. 1.5 is the average UHI, but it can be up to nearly 5 but as low as 0 on some days - see the distribution histograms. As I say in the paper the 1.5 isn't wholly a UHI. I reckon some is due to sites where central London is would have been warmer than Rothamsted and Gatwick without London being there. When the UHI came into existence is gradually from Medieval times through to the 19th century. I don't think its magnitude has changed since then. It clearly hasn't since 1960. Whether it will change with climate change is the issue. I don't think it will. Cheers Phil 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 ----------------------------------------------------------------------------