cc: "Pete Lamb" , jimx04@lzu.cn date: Wed Oct 15 13:24:01 2008 from: Phil Jones subject: Re: CRU Temperature Problem to: hjp@lzu.edu.cn Dear Jianping, The data we have for Mangya (51886) have come from CMA. I'm attaching a recent paper which discusses Chinese temperatures and possible urbanization influences. Reading the paper you will see that the Chinese data is a new homogenized station developed by Qingxiang Li from CMA. I'd suggest you contact Li. His email is . Li will have the homogeneity adjusted version of this series, if it needed adjusting. Send him the figure. From a look at the figure, it seems as though the purple series has been adjusted compared to the CRU version. Have you compared the series for 51886 with neighbouring sites in China? Best Regards Phil At 10:48 15/10/2008, hjp@lzu.edu.cn wrote: Dear Prof. Jones I am writing to you about the difference between CRU and CMA (China Meteorological Administration) surface station observation data for 51886 (38.15o, 90.51 o). We found that the increasing of this station observed temperature is much higher than CRU reanalysis data (see attached plot). Recently, Dr. Peter Lamb visited us and discussed this difference. He suggests me to send email to you about this problem and ask your help. Because of human activity, I think the CMA observation data is right and CRU may be over-correction the value of temperature. Can you give us some suggestion for qualification and uncertainty of CRU as well as CMA data? We are looking for to hearing from you. Best Wishes; Jianping Huang -- +++++++++++++++++++++++++++++++++++++++ Dr. Jianping Huang Professor and Dean College of Atmospheric Sciences Lanzhou University Lanzhou, China, 730000 Tel: (0931)8914282; Fax: (0931)8914278 email: hjp@lzu.edu.cn [1]http://climate.lzu.edu.cn/~jhuang ++++++++++++++++++++++++++++++++++++++++ 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 ----------------------------------------------------------------------------