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Poster: Citizen Runner
Subject: RE: Greenland ice sheet melting faster than previously thought. PLEASE RECYCLE!
Body:
rose colored glasses? wrote:

One more post to show why I think the "big blue graph" with CO2 levels is essentially meaningless.

"Meaningless" is a strong word. The original paper was clear on the time resolution of the data. As I noted previously, for your theory of rapid variations in atmospheric CO2 to be plausible, you would have to propose a mechanism for rapid change in that parameter. The fact that temperature changes rapidly is meaningless as an analogy beyond showing the mathematics of a moving average.

You can't say anything at all about the highest single year value, or the highest ~ 60 year value, except that it was CERTAINLY higher than the highest recorded 1500 year moving average value.

Hence the claim that past CO2 levels have never exceeded some specific value is simply (very) bad science, unless the claim comes with the clarifier, "the 1500 year moving average value never exceeded...," and the comparison to current levels is made with a current 1500 year moving average.

The "Gases in Ice Cores" paper cited earlier discusses other sample sets with much better time resolution (30 years in one case) going back to the 1300s with CO2 variation of +/- 5 ppm. Apparently they get much better resolution from cores where the ice accumulates quicker, but they can't go back as far in time.
http://cdiac.ornl.gov/trends/co2/graphics/lawdome.gif
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