Home > CRUTEMP, GIStemp, satellites > Did Global Warming Stop in 1940?

Did Global Warming Stop in 1940?

2011 January 3

I used the data set prepared by O’Day over at Climate Charts & Graphs. Thus, we have charts for GISTEMP, HadCRU, and NOAA. The data for Dec 2010 is still missing – but I’m using the ave for Jan-Nov for the 2010 annual data.

The script is here

Trend GISTEMP 1940 30

Trend CRU 1940 30

Trend NOAA 1940 30

Of course, satellite data does not extend far enough back to run trends in 1940.

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  1. William Quinn
    2011 February 5 at 7:58 am

    Did the delay in global warming effect have something to do with WW2? The change beginning in 1940 seems very striking.

  2. 2011 February 5 at 8:22 am

    I believe that the prevailing theory is that the post WWII cooling is largely due to aerosols released from increasing manufacturing and industrialization. A cooling effect that was largely lost in the ‘clean air’ movements of the 1970s.

    I also believe that the ‘bucket theory’ has been offered as an explanation – that either the changes in the methods of gathering sea temperature or the adjustments made to handle those methodological changes have made the early part of the 20thC appear cooler relative to the last half than it actually was.

    Don’t get me wrong, though. I don’t pretend to know the answer. Solar? Volcanic? PDO? Arctic ice feedbacks? Dunno.

  3. 2011 February 5 at 9:23 am
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