date: Wed, 19 Sep 2007 16:59:44 -0700 (PDT) from: Rean Guoyoo subject: Re: thank you to: Phil Jones The following message was returned back when I sent via cma site. I send it again via this site. I also forwarded this message to Dr, Li Qingxiang. Regards, Guoyu Dear Phil, Thank you for your message of Sept 11, 2007. I have just been back from the US. Sorry for the delayed response. I noted the discussion on blog sites. This is indeed a big issue in the studies of climate change. In the past years, we did some analyses of the urban warming effect on surface air temperature trends in China, and we found the effect is pretty big in the areas we analyzed. This is a little different from the result you obtained in 1990. I think there might be at least three reasons for the difference: (1) the areas chosen in the analyses are different; (2) the time periods analyzed are obviously varied, and the aft-1990 period is seeing a more rapid warming in most areas of China; (3) the rural stations used for the analyses are different, and we used some stations which we think could be more representative for the baseline change. We have published a few of papers on this topic in Chinese. Unfortunately, when we sent our comments to the IPCC AR4, they were mostly rejected. It is my opinion that we need to re-assess the urbanization effect on surface air temperature records for at least some regions of the continents. I am glad that you are going to redo it using the updated dataset. I expect you to obtain the new outcome. As for the dataset, I believe that Dr. Li Qingxiang could give you a hand. He and his group conducted a lot work of detection and adjustment of the inhomogeneities in the past years, and the adjusted and the raw datasets are all stored and managed in his center. The datasets we used are also from his center. I'd be happy to discuss some issues with you late, but I would not necessarily be as a co-author because my contribution would be rather minor. Best regards, Guoyu NCC, Beijing ______________________________________________________________________________________ Shape Yahoo! in your own image. [1]Join our Network Research Panel today!