To be able to see signs of global warming linked to CO2 you need two things (1) accurate CO2 data and (2) accurate temperature data. There is I believe accurate instrumental CO2 data but only since 1958 at Mauna Loa, as for temperature, well there are thousands of high quality rural weather stations throughout the world and especially in the US and the northern hemisphere that have long histories and NO UHI bias. These stations are totally uncontaminated and provide temperature data from a totally natural environment like Mauna Loa supposedly does for CO2.

What do warmers such as Hanson/Giss do, well, they compare data from a highly UHI contaminated urban city weather station with CLEAN data from a neighbouring RURAL station. They then Use some secret algorithm put all the data through a computer which then gives them the result in degrees C. The odd thing is that the result always appears to show a steep rising temperature trend when the neighbouring RURAL CLEAN data shows only a flat or a slightly rising temperature trend.

Would it not have been more logical to have discarded the contaminated data from the Urban stations and used only the clean data from the Rural sites.
Surely data from fewer clean stations is preferable.

Interesting info on the area’s temperature differences. The LFT airport site clearly suffers from urban heat island effects more so than the surrounding region. I remember consistent large positive temperature bias at the airport as compared to the NWS certified temperature site located across town at KLFY TV, especially when there was a west to northwest wind blowing ( the airport is on the southeast end of Lafayette, Louisiana.) For that matter, you can compare the readings from KLFY and the airport as well as other sites in the area via the regional climate summary put out by the Louisiana Office of State Climatology. Here is a link to the monthly data, updated daily.

http://www.losc.lsu.edu/divisions.html

Especially when beastly FILENET intrudes. (Sigh.)

Also consider all those urban adjustments being lowballed as a result of being compared with rural sites with CRN4&5 violations!

That comparison of two stations about 15 miles apart is very illuminating, and the differences between them can range beyond the level of supposed warming of the planet over the 20th century; so arguably those station differences just 15 miles apart are very significant.

So much for the claim that temperatures correlate well over distances up to 1200 km.

In the end, it doesn’t matter if climate models are any good or not; the raw data that is being fed into them is clearly bogus, and the degree of violation of the Nyquist criterion for sampled data systems, is so huge, that any claimed value for the mean global temperature has to be taken with a grain of salt. You only have to violate Nyquist by a factor of two to get aliassing noise all the way down to zero frequency, which of course is the sought average. It’s the old garbage in-garbage out syndrome. And apaprently the station temperature records even violate the Nyquist criterion for the temporal variation, by at least a factor of two as well, since once per 24 hours reporting is inadeuqte to reconstruct the daily temperature cycle either.

So we have junk data going into junk models, and being reported as science.

George

It seems that NOAA would try to install new stations in national forests or state forest (clearings) using remote readouts. The current system is terrible. the current system with so far 54% ? with bias of >=2C. I don’t think that they will ever be able to do away with surface temp sensors but surely we can find better ways of measurement.
‘
Bill Derryberry

http://www.ejournal.unam.mx/atm/Vol21-2/ATM002100202.pdf

http://data.giss.nasa.gov/work/gistemp/STATIONS//tmp.425747550010.1.1/station.txt

John M Reynolds

REPLY: Look like that’s not a permanent link at GISS, sorry, not fixable.

Oops.

Ocean acidification doesn’t kill algea, it increases photosynthesis.

http://www1.ncdc.noaa.gov/pub/data/uscrn/documentation/research/Sun.pdf

when you get to the end you’ll see them discuss the microsite issues at the ASOS