23 Mar '12, 4pm

Data presentation: A trend lesson

Data presentation: A trend lesson

I just came across an interesting way to eliminate the impression of a global warming. A trick used to argue that the global warming had stopped, and the simple recipe is as follows: Cut off parts of the measurements and only keep the last 17 years. Plot all the months of these 17 years to get plenty of data points. A good idea is to show a streched plot with longer time axis. I’ve tried to reproduce the plot below (here is the R-script ): Plotting the monthly anomalies of the global mean temperature. At least, many different global analyses were shown – not just the one which indicates weakest trends since year 2000. The data presented in this case included both surface analyses (GISTEMP, NCDC, and HadCRUT3) in addition to satellite products for the lower troposphere (Microwave Sounding Unit – MSU). The MSU data tend to describe more pronounced peaks associated with the E...

Full article: http://www.realclimate.org/index.php/archives/2012/03/dat...

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