Derek, who has recently spent much time and effort looking over
the MLO carbon dioxide measurements and data, kindly supplied a number of data
sets of differing dates. I simply took the differences between sets,
referencing to the latest (17 December 2008) release, and plotted them out.
I believe that the major adjustments are documented. One thing
that draws question is how the apparently random differences mostly prior to
1973 were corrected?