Trend in Atmos CO2 Concen over Industrial Era

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Description:
Time trend of the concentration of CO₂, in ppm, in air extracted from an Antarctic ice core combined with the trend based on direct atmospheric measurements.

Open Black Circles: CO₂ concentration in air extracted from Antarctic ice cores (Tellus, Vol51B, 1999). Ice core data are rejected after 1955 which overlap direct measurements.

Black Triangles: Proxy data derived for 1955 to 1958 to connect ice core data to direct measurements.

Closed Black Circles: Annual values selected from a spline fit to direct monthly data for Mauna Loa Observatory and the South Pole combined.

Black Curve: Spline function combining separate fits to the direct data, the proxy data, and the ice core data.

Data from Scripps CO₂ Program.
Last updated September 2004.