from: Rean Guoyoo <guoyooatXYZxyzoo.com>
subject: Re: thank you
to: Phil Jones <p.jonesatXYZxyz.ac.uk>
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.
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
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.
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