Many of us are aware of the cherry-picking of proxy series that goes on in the temperature reconstruction world. This cherry picking is both manual — a thousand plus proxy series exist but the same 20-30 that are known to create hockey sticks are selected over and over; and algorithmic — McIntyre and McKittrick demonstrated how Michael Mann’s algorithms preferentially put high weights on hockey-stick shaped series.
I think a lot of us has suspected something similar in the surface temperature measurement indexes like the Hadley CRUT3, the main metric relied on by the IPCC.
On Tuesday, the Moscow-based Institute of Economic Analysis (IEA) issued a report claiming that the Hadley Center for Climate Change based at the headquarters of the British Meteorological Office in Exeter (Devon, England) had probably tampered with Russian-climate data.
The IEA believes that Russian meteorological-station data did not substantiate the anthropogenic global-warming theory. Analysts say Russian meteorological stations cover most of the country’s territory, and that the Hadley Center had used data submitted by only 25% of such stations in its reports. Over 40% of Russian territory was not included in global-temperature calculations for some other reasons, rather than the lack of meteorological stations and observations.
So, maybe they were chosen because they had higher quality data with fewer data gaps. Wrong:
The HadCRUT database includes specific stations providing incomplete data and highlighting the global-warming process, rather than stations facilitating uninterrupted observations.
On the whole, climatologists use the incomplete findings of meteorological stations far more often than those providing complete observations.
Maybe they were urban biases in the data that was excluded. No, just the opposite:
IEA analysts say climatologists use the data of stations located in large populated centers that are influenced by the urban-warming effect more frequently than the correct data of remote stations.
So, without the CRU giving any clear set of decision rules for station selection, we are left with this:
The data of stations located in areas not listed in the Hadley Climate Research Unit Temperature UK (HadCRUT) survey often does not show any substantial warming in the late 20th century and the early 21st century.
I am sure it is the purest coincidence that stations excluded from metrics like this show less warming and proxies excluded from temperature reconstructions don’t look like hockey sticks.