Tag Archives: GHCN

Homogenisation of temperature data

How accurate is the pair-wise homogenisation algorithm applied to GHCN land temperature measurements and the instrumentation corrections made to sea surface temperatures? Long term station measurements are affected  by a station’s physical relocation, by environmental changes (urban development)  and by … Continue reading

Posted in AGW, Hadley, NOAA, Uncategorized | Tagged | 19 Comments

GHCNV4 September Temperature is either 0.93C or 0.70C

My calculation uses  a 3D integration of GHCNV4 and HadSST3  temperature data.  If I use GHCN V4C (corrected data) I get 0.93C for September,  whereas if instead I use the uncorrected V4U I get 0.70C. In the first case 2020 … Continue reading

Posted in climate science | Tagged , | 7 Comments


Each monthly update of V4C (corrected)  changes past results as well as adding the new monthly temperatures. This is due to their homogenisation algorithm.  I had already noticed that V4 gave warmer results than V3 but found that the uncorrected … Continue reading

Posted in AGW, climate science, NOAA | Tagged | 1 Comment