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A 200-meter ice core drilled at Siple Station in West Antarctica during the 1983-84 summer provides ancient atmospheric CO2 concentrations. The core was dated with an accuracy of approximately ±2 years to a depth of 144 meters, corresponding to the year 1834, by counting seasonal variations in electrical conductivity. The data was produced by researchers from the University of Bern and the Polar Ice Coring Office, with analytical details published in papers from 1984-1986.
The data is hosted on a transition website (CDIAC), which may indicate legacy status.