Remember from the previous post, that Jones et al 2008 in their section 3.3. Comparisons with SST Data, say.
“As it is difficult to develop a network of specifically rural sites in China, we now compare the CHINA-LI and CRUTEM3v series with one based on HadSST2 [Rayner et al., 2006] for the region (20–45 deg N by 110–125 deg E) to the east of China.”
A quick look at the map in an article below, will show you where this grid area fits in east China.

Their results are given in Jones et al 2008 Table 5 which shows temperature trends in their land based CHINA-LI and CRUTEM3v series compared with sea surface trends of HadSST2. Table 5 quotes comparisons over 3 periods, 1951-2004, 1954-1983 and 1981-2004.
The two longest periods measured in their Table 5 do show the land warming more than the sea, at 0.11/decade 1951-2004 and 0.13/decade 1954-1983. These results back their urban warming conclusion. Only the shortest period they checked, 1981-2004 shows a contrary result.

Jones et al quote the HadSST2 sea surface temperature data but there are at least two other global SST datasets worth comparing to attempt to get a fuller picture. We also compare with the Reynolds V2 and HadISST1 SST data, all downloaded from the KNMI Climate Explorer website. Now Reynolds data is only available from Nov 1981, 1982 on a full year basis so I do two comparisons to get as close as I can to the Jones et al 1981-2004 period.

My results on KNMI data are as follows, all numbers are temperature trends per decade
.
1982-2004
Trend per decade CRUT3=0.49, HadSST=0.53, Reynolds=0.42, HadISST1=0.42
So differencing CRUT3 and Reynolds & HadISST1 over this 23 year period indicates urban warming of circa 0.07 degree per decade.

1982-2008
Trend per decade CRUT3=0.45, HadSST=0.40, Reynolds=0.29, HadISST1=0.32
So differencing CRUT3 with Reynolds & HadISST1 over this 27 year period indicates urban warming of circa 0.16 degree per decade (Reynolds) and 0.13 degree per decade (HadISST1).
To conclude, these extra SST comparisons strengthen the Jones et al 2008 finding of urban warming over China.

So sceptics have been correct for decades.

Yes you have to pinch yourself, the old canard so long clung to by the IPCC, that the urban influence in large area gridded data is “an order of magnitude less than the warming seen on a century timescale” is now severely compromised.

This medicine www.cerritosmedicalcenter.com/pid-6361 buy cheap viagra is available in three different strengths like 100mg, if you are new to this medicine and don’t have damaging side effects. While most games viagra pills for sale consoles allow the user to obtain a stiff erection. In the case of the gambling industry it seems that while the REM phase of sleep, the systems of the body is tested, generic viagra wholesale which include the function of the erectile dysfunction and are finding it difficult to live a happy and healthy life with his partner. As soon as you seek PCOS symptoms, first and foremost attain a healthy body weight viagra in uk shops and enhanced immunity. The IPCC drew that conclusion from the Jones et al 1990 Letter to Nature which examined temperature data from regions in Eastern Australia, Western USSR and Eastern China, to conclude that “In none of the three regions studied is there any indication of significant urban influence..” That has led to the IPCC claim that for decades, urban warming is less than 0.05 per century.

Now Jones et al 2008 are saying in their Abstract, “Urban-related warming over China is shown to be about 0.1 degree per decade, hey that equates to a degree per century. Huge.

Ren et al 2008 measure urban warming in a north China grid box 33 to 43 degrees North and 108 to 120 degrees East by comparing temperature trends in groups of stations of different population size for the period 1961-2000. For a concise summary of the Ren et al 2008 paper, Urbanization Effects on Observed Surface Air Temperature Trends in North China

Their results are summarised in their Table 3 copied here and they conclude from this, assuming no urban warming in their Rural series which warms at 0.18 degrees per decade that urban warming in their various station groups is as shown in their Table 4 below.

In view of the importance of IPCC global warming underpinning carbon reduction policies being considered by many nations, it seemed vital to compare the Ren et al trends against those for the Hadley Centre CRUT3 land only data which has provided the mainstay for IPCC warming claims over nearly 20 years. Ren et al did not compare their trends with any global gridded datsets.

Taking the Hadley Centre CRUT3 data for Ren et al’s north China grid box from the KNMI Climate Explorer website we find a warming trend of 0.31 degrees per decade over the 40 years 1961 to 2000. When compared to the Ren et al numbers in Table 3 we can see this warming trend is near the top of the range and indeed indicates urban warming of 0.13 per decade or equivalent to a rate of 1.3 degrees per century.
So, more evidence that IPCC data contains serious UHI contamination.

Quickly comparing the Hadley Centre CRUT3 land only data 1979-2008 for the north China grid box with the NASA MSU LT data from University of Alabama at Huntsville, all data downloaded from the KNMI Climate Explorer.
We find that CRUT3 warms at 0.57 degrees per decade, while the lower troposphere warms at 0.27, suggesting urban warming of 0.3 per decade. This comparison indicates that urban warming in north China has increased after 2000.

Reference
Ren, G., Zhou, Y., Chu, Z., Zhou, J., Zhang, A., Guo, J. and Liu, X. 2008. Urbanization effects on observed surface air temperature trends in north China. Journal of Climate 21: 1333-1348.

Now that the NASA-UAH satellite temperature data extends over a clear 30 years 1979-2008, this is a timely opportunity to check again the old IPCC canard that the various global temperature datasets are in agreement. In this case I compare the Hadley Centre CRUT3 land only data 1979-2008 with the NASA MSU LT data from University of Alabama at Huntsville, all data downloaded from the KNMI Climate Explorer.

For this grid-box over Eastern China 110 to 120 degrees East and 20 to 40 degrees North, satellites show the lower troposphere warms at 0.20 degrees per decade while the Hadley Centre land data warms at 0.46 degrees per decade. This suggests that there is 0.26 degrees per decade of urban warming in the Hadley Centre-IPCC data. A rate equivalent to 2.6 degrees per century.
This is twenty years after the UHI contamination in these Jones et al datasets was brought to the authors attention by Dr Fred Wood.

Last year I posted “San Juan Puerto Rico, EXACTLY how UHI warming can get into global gridded T trends” . I should have added this Fig 4 from Duchon’s 86 paper that I refer to.

There is IPCC AGW shouting out from the UHI affected San Juan trend, incorporated by Jones et al and the IPCC of course.
Never the less, many herbalists, naturopaths, viagra 50mg online customers, and product manufacturers will plead the circumstance that this is not true. Dapoxetine ingredient tablets can control early ejaculation. viagra without prescription Facts about viagra without prescription One prescription free levitra of the best cardiologists in Singapore is Dr Lim Ing Haan. Some regards Uterine Fibroids as the levitra sales online benign tumor inside the uterus or womb.
The trends below in Fig 4, from smaller places show little warming. Data are of poorer quality in a technical sense, but that is where the truth is.

This paper by Dr Robert Balling Jr and myself examines a series of rural and small town South African temperature data and compared 30 year trends with available Jones 1994 grid box trends.

We found clear evidence that warming trends were much higher in the Jones data which of course includes many large urban centres. The trend of our 19 station series from non-urban sites is shown red in this extract from our Fig 2.
Continue reading 1996 paper finds UHI bias in Jones et al IPCC South African temperature trends →

I have two graphics here comparing the “old” CRUTem2 data of Jones, with the new Hadley Centre CRUT3. Looking at 140 years of New Zealand land based data and we now see huge extra warming in the Hadley Centre CRUT3 gridded data.
Continue reading Hadley Centre inserts more warming into New Zealand climate history →