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Averaged over all land and ocean surfaces, temperatures warmed roughly 1.53°F (0.85ºC) from 1880 to 2012, How much has the global temperature risen in the last 100 years? | UCAR - University Corporation for Atmospheric Research
If you are using data from 100’s of thermometers scattered over a wide area, with data being recorded by hand, by dozens of different people, the observational resolution should be reduced.
In the oil industry it is common to accept an error margin of 2-4% when using manually acquired data for example.
As far as I am aware, historical raw multiple temperature data from weather stations has never attempted to account for observer error.
We should also consider the accuracy of the typical mercury and alcohol thermometers that have been in use for the last 120 years. Glass thermometers are calibrated by immersing them in ice/water at 0c and a steam bath at 100c.
The Metrology of Thermometers
So not only over the past 120 years human observers have been logging their error prone readings manually into logs and then re-copied into another log but the National Oceanic and Atmospheric Administration has closed some 600 out of nearly 9,000 weather stations over the past two years that it has deemed problematic or unnecessary, after a long campaign by one critic highlighting the problem of using unreliable data. Distorted data? Feds close 600 weather stations amid criticism they're situated to report warming | Fox News
Finally just a simple question that in light of that 12.5% of the Earth's land mass was NOT included in the 60 years of temperature readings?
When "The number of [Siberian] stations increased from 8 in 1901 to 23 in 1951 and then decreased to 12 from 1989 to present only four (4) stations, those at Irkutsk, Bratsk, Chita and Kirensk, cover the entire 20th century.
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…
The scale of global warming was exaggerated due to temperature distortions for Russia accounting for 12.5% of the world’s land mass.
The IEA said it was necessary to recalculate all global-temperature data in order to assess the scale of such exaggeration.
Climategatekeeping: Siberia
If you are using data from 100’s of thermometers scattered over a wide area, with data being recorded by hand, by dozens of different people, the observational resolution should be reduced.
In the oil industry it is common to accept an error margin of 2-4% when using manually acquired data for example.
As far as I am aware, historical raw multiple temperature data from weather stations has never attempted to account for observer error.
We should also consider the accuracy of the typical mercury and alcohol thermometers that have been in use for the last 120 years. Glass thermometers are calibrated by immersing them in ice/water at 0c and a steam bath at 100c.
The Metrology of Thermometers
So not only over the past 120 years human observers have been logging their error prone readings manually into logs and then re-copied into another log but the National Oceanic and Atmospheric Administration has closed some 600 out of nearly 9,000 weather stations over the past two years that it has deemed problematic or unnecessary, after a long campaign by one critic highlighting the problem of using unreliable data. Distorted data? Feds close 600 weather stations amid criticism they're situated to report warming | Fox News
Finally just a simple question that in light of that 12.5% of the Earth's land mass was NOT included in the 60 years of temperature readings?
When "The number of [Siberian] stations increased from 8 in 1901 to 23 in 1951 and then decreased to 12 from 1989 to present only four (4) stations, those at Irkutsk, Bratsk, Chita and Kirensk, cover the entire 20th century.
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…
The scale of global warming was exaggerated due to temperature distortions for Russia accounting for 12.5% of the world’s land mass.
The IEA said it was necessary to recalculate all global-temperature data in order to assess the scale of such exaggeration.
Climategatekeeping: Siberia