Why is Siple ice core CO2 data shifted 83 years?
This is typical global warming denial nonsense. The date of the ice cores is when the ice first forms and is soft (“firn”). Air is enclosed later as more ice forms on top and compresses it into a hard layer. Not just my opinion: “Because the bubbles are formed not at the surface but at the firn-ice transition, the air is younger than the surrounding ice. ” “Physics of Glaciers”, W.S.B. Patterson Pretty basic science. Not understanding this is either ignorance or something more sinister. It varies site to site, and there are a variety of ways of measuring it. “For Siple Station (Antarctica), this age difference and age distribution width were deduced from the bubble volume measured as a function of depth. The values are 95 yr and 22 yr respectively.” “Age difference between polar ice and the air trapped in its bubbles”, Schwander, J.; Stauffer, B.Nature, Volume 311, Issue 5981, pp. 45-47 (1984) http://adsabs.harv
