cc: liqx@cma.xxx

date: Tue, 25 Sep 2007 11:16:37 +0800

from: =?gb2312?B?JUQ1JUM1JUMwJUYyJUMzJUY0IA==?= <limmy@xxx>

subject: Re:Re: thank you

to: p.jones@xxx

 

Dear Phil,

 

Again I find that the emails from my CMA mail boxes can not get to you.

 

From attaches please find the data of 42 urban stations and 42 rural stations (by your

list) and a reference of homogenization of the data. we have tested and adjusted the abrupt

discontinuities of the data during 1951-2001, but the following years (2002-2004) has only

been quality controled and added to the end of the series, but we found the relocation

during these 3 years have minor effects on the whole series in most of the stations.

 

I  partly agree with what Prof. Ren said. and we have done some analysis on the urban heat

island effect in China during past years. The results are differnt with Ren’s. But I think

different methods, data, and selection of the urban and rural stations would be the most

important causes of this. So I think it is high time to give some new studies and graw some

conclusion in this topic.  I hope we can make some new achives on this both on global scale

and in China.

 

Best

 

Qingxiang

 

—– Original Message —–

From: “Phil Jones” < p.jones@xxxx >

To: “Rean Guoyoo” < guoyoo@xxxx >

Cc: “%D5%C5%C0%F2%C3%F4″ < limmy@xxx>, < liqx@cma.xxx >

Sent: 2007-09-24 16:25:59 +0800

Subject: Re: thank you

Dear Guoyu,

I think I emailed you from America last week. I am away again next week,

but here this week.

I do think that understanding urban influences are important.  I will

wait for Dr Li Qingxiang to send some data, but there is no rush, as I am

quite busy the next few weeks.

Best Regards

Phil

At 00:59 20/09/2007, you wrote:

 

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

 

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Prof. Phil Jones

Climatic Research Unit        Telephone +44 (0) 1603 xxxx

School of Environmental Sciences    Fax +44 (0) 1603 xxxxx

University of East Anglia

Norwich                          Email    p.jones@xxxxx

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UK