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 is a combination of the Antarctic ice core record from Law Dome before 1958 (Macfarling Meure, C. et al., 2006: Law Dome CO2, CH4 and N2O ice core records extended to 2000 years BP. Geophysical Research Letters, 33.) and a seasonally detrended arithmetic average of monthly air measurements from Mauna Loa and the South Pole from the Scripps CO₂ program after and including 1958. The records were combined without adjustment. Ice core data are rejected after 1958 which overlap direct measurements. The ice core data are interpolated to monthly resolution using a spline with a stiffness of 0.6.

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 to the direct data and the ice core data.

Mauna Loa and South Pole Data from Scripps CO₂ Program.
Last updated December 2010.