Tuesday, 8 August 2017

1898. HadCrut4.

Six claims for the global historical surface temperature anomaly of the January-to-December calendar year 1898, which:- 

Could be as low as, but is no lower than,  -0·65ºC................Claim #1. 
Could be as low as, but is no lower than,  -0·55ºC................Claim #2. 
Could be as low as, but is no lower than,  -0·38ºC................Claim #3.
Could be as high as, but is no higher than,  -0·16ºC..............Claim #4.
Could be as high as, but is no higher than,  -0·27ºC..............Claim #5.
Could be as high as, but is no higher than,  -0·22ºC..............Claim #6.

The monthly series of HadCrut4 version 4·0·0·0 entails claims #1 and #4. The annual series of HadCrut4 version 4·0·0·0 entails claims #2 and #5. The annual series of HadCrut4 version 4·0·0·0decadally smoothed by the application of a 21 point binomial filter entails claims #3 and #6. Alternative link for HadCrut4 version 4·0·0·0. Question. If the numerical value of the global historical surface temperature anomaly for any interval depends on the method of its calculation, then what is a global historical surface temperature anomaly, apart from a mathematical fiction?

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