The lower plot is adjusted mean temperatures from NOAA file v2.mean_adj. The NOAA readme file says that v2.mean_adj was computed by adjusting the data from v2.mean for various things. They didn't say what those things might be. Notice the adjustments trashed all the data from 1701 to 1838. After 1838 the adjustments flatten the temperature curve, and the last ten years show a small decline, supporting those who say world temperature has declined since 1998. The downward glitch in 2006 might be explained by a drastic reduction in the number of temperature readings that occured in 2006.
I lack faith in NOAA's adjustment process. I have not yet found an explanation of what the adjustments might be. Trashing the record from 1701 to 1838 is not a confidence builder. The 2006 glitch has got to be an error. I remember 2006 and it wasn't that cold.
Color me confused. The raw mean temperature says the world have been warming since 1701. The adjusted mean temperature says the world has been about the same since 1838. Who you gonna believe? I don't believe the science is settled.
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