Trawling through files from 2001 I came across this rare example of an email from Dr Jim Hansen that actually gives an insight into what GISS does with temperature data.
For background I have my page commenting on Jones et al use of Miami.
www.warwickhughes.com/climate/miami.htm
Then my page on the five degree grid cell covering much of Florida and commenting on Jones 1994 additions.
www.warwickhughes.com/climate/florida.htm
Then this page commenting on GISS data which inserts warming into rural data west of Miami.
www.warwickhughes.com/climate/giss_fl.htm
Continue reading How NASA GISS inserts warming into USA rural T data
Category Archives: Urban Heat Islands
How did Jones et al 1986 and Jones 1994 select Atlanta ?
This is the first “city” study I put online in 2000. There is nothing isolated about Jones using a city with such obvious UHI contamination as Atlanta, they used hundreds of cities.
In the face of this methodology, the AMS journal in 1986 published not ONE comment and I am not aware anybody tried to comment. I look forward to hearing some justifications from IPCC supporters for the use of Atlanta and similar data to contribute to an accurate measure of global temperature trends.
Australian reviews of UHI errors (Part 2)
In 1991 the writer (WSH) reviewed the Jones et al temperature data for Australia along with a wider selection of Australian data while associated with the Tasman Institute in Melbourne. The Executive Summary of that unpublished report which was circulated to interested parties, has survived in digital form and is presented here for the first time.
[Note, the Tasman Institute was a free market think tank in Melbourne for about a decade, closing in the late 1990’s.]
Australian reviews of UHI errors (Part 1)
In Australia, two unpublished reports were generated about 15 years ago which went to the issue of the validity of using urban stations to compile large area temperature trends.
[1] The 1990 BoM draft Paper, M.J. Coughlan, R. Tapp and W.R. Kininmonth; 1990, “Trends in Australian Temperature Records” by three senior BoM staff, defined urban heat island (UHI) magnitudes by various comparisons between central city sites in all the Australian state capitals and their respective airports, more than one satellite site in the case of the larger cities.
The BoM found substantial urban warming greater than the scale of global warming. Extracts from Coughlan et all 1990 are below.
[View first page of Coughlan et al 1990. Download 300KB zip file of 18 gif images of Coughlan et al ]
Conclusion from Coughlan, et al 1990 re Urbanization Trends
3.3 Mean temperatures
Estimates of the trends in the annual average daily mean temperature also indicated warming at most of the non-urban sites except Brisbane Airport. The strongest warming over the periods examined was 0.26 C decade-1 Mean temperatures at Brisbane Airport cooled by approximately 0.03 C/ decade. Trends in urban-rural differences were all positive.
These estimates are greater than those of the trends this century, reported by Jones et al. (1989), in annual mean Southern Hemisphere air temperature, over both land and sea, and sea surface temperature, which have all shown rises of approximately 0.06 C /decade.