Carrying on from the previous post re UHI in China, it is fascinating that the Jones HadCRUT2 data has an amazing close agreement with MSU lower troposphere, 1979-2005 over most of the the USA 48 States from 30 to 50 North incl a small strip of far south Canada.
– Measuring the following four bands of grid cells, starting in the south at 30 to 35 North (LA), extending 9 cells east to Charleston 75W.
– Next on 35 to 40 North from 125 West to 70 West, 11 grid cells.
– Then 40 to 45 North, same longitude limits, 11 grid cells.
– Finally 45 to 50 North, 125 West to 50 West, 15 grid cells.
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Considering the large blocks of grid cells in other global regions where HadCRUT2 warms strongly compared to MSU 1979-2005: www.warwickhughes.com/blog/?p=45 it is worth pondering why there is this close agreement between HadCRUT2 and MSU over the USA ?
Could it be pure chance ? Could it be due to superior USA surface data quality ? Is European surface data so bad ?
You see the issues. Why this great variation in HadCRUT2 minus MSU for different global regions ?