Feb 26 2009
Update:Â Â Some commenters are claiming these are graphs of two different data sets, though I swore I grabbed the same graph from the December and January reports at NCDC. I recall that the historical years have been stable in each report (since I look at them every month), with only the current year moving as we proceeded through it. Maybe my memory is playing tricks on me! - end update
OK folks, let’s take a look at two pictures of the global climate from one source (NSDC) with well recorded issues regarding data quality and modeling accuracy. First, the global trend as of December, 2008:
Now look at the same graph one month later:
You can click the images to go to the large originals. Just look at the land columns for the last 20 years – they are completely different! 2008 (last year in the top chart) went from a +0.6Â°C to almost nothing. And the 2007 line went from +0.7Â°C to almost +1.5Â°C. Â In fact the entire global history has been rewritten in one month (I was wondering why the report was a full week late this month. In December the land measurements were flat, with a few spikes every couple of years. By January the whole pattern changed.
Well, we know there was no dramatic break through in global warming in the last 6 weeks, so who is rewriting history? Big Brother?
BTW, these are the same people who missed a CA sized segment of the North Pole Ice Extent in their data. Woohoo!