Dreyfus, G. Well, according to the first graph, we can read ice cores for about 10, years into the FUTURE, when it will be the year I think it is likely that the ice core of CO2 measurements is at best hundred years average. Trusel, F. However, such estimates are critically based on the assumption that the accumulation rate has not varied greatly over the past. Another complication is that in areas with low accumulation rates, deposition from fog can increase the concentration in the snow, sometimes to the point where the atmospheric concentration could be overestimated by a factor of two.
Also, to what degree has each ice core data set been cross-referenced to each corresponding data set by location and researcher ie do we have a list by year of all of the available ice core data for that year to achieve a reasonable average?
Ice Cores and the Age of the Earth
You can see in the first figure in the RealClimate. Also, as the earth warms, most of that energy is absorbed by the oceans. Summary Ice cores provide direct information about how greenhouse gas concentrations have changed in the past, and they also provide direct evidence that the climate can change abruptly under some circumstances. Hi there, although I myself am not at OSU, I can provide some perspective from a faculty member there and his co-authors. Dragging them down the length of the core, and recording the conductivity at each point, gives a graph that shows an annual periodicity. Falourd, H. Steffensen, G.