date: Fri Sep 19 14:57:47 2008 from: Phil Jones subject: Re: your references to: Zong-ci, Here are two pdfs. The paper by Brohan et al (2006) is too big to email. This papers looks at the uncertainty in more detail than earlier. Also I've attached a recent paper on Chinese urban issues in JGR. I think China is one of the few places that are affected. The paper shows that London and Vienna (and also New York) are not affected in the 20th century. There are a couple of issues re your points 1-4. The stations don't need to be continuous. We are using anomalies, so all we need is the base period of 1961-90. The third attachment has a figure in of the effect of changing numbers. Cheers Phil At 03:26 19/09/2008, you wrote: Dear Phil: A famous Chinese Journal asked me to review a Chinese paper. They investigated on the uncertainties of the global observed data of the surface air temperature for the last 100 years by the IPCC AR4. They argued and oppugned the global warming for the last 100 years. They show several key points: (1)A low coverage of the observed temperature (2)An asymmetric distribution of the observed temperature (3)The different decades had the various numbers of the stations for the last 100 years (4)The data of most stations are discontinuous. Only a few stations had the long time series such as 100 years. (5)Effects of Urbanization and heat islands on most stations I remembered that you and your group had investigated those issues for a long time. Can you send me some references by e-mail? For example, Brohan, P., et al., 2006, Uncertainty estimates in regional and global observed temperature changes: a new data set from 1850, J.G.R., III, D12106, doi:10.1029/2005JD006548; Jones, P.D. and A.Moberg, 2003, Hemispheric and large-scale surface air temperature variations: An extensive revision and update to 2001, J.Clim., 16, 206-223£»and others. Thank you very much. I am sorry to disturb you. Best regards. Zong-Ci 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 ----------------------------------------------------------------------------