Global Stations Isotopic Trends

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Description:
Black Dots: Monthly average reduced isotopic ratio of atmospheric carbon dioxide, δ¹³C, versus time at stations in the Northern and Southern Hemispheres where δ¹³C is in per mil.

Black Curves: The sum of 4 seasonal harmonics and a spline function to the stations δ¹³C data. The seasonal harmonics include a linear gain factor, to represent increasing amplitude with time.

Station code names are as follows: PTB = Point Barrow, LJO = La Jolla, MLO = Mauna Loa Observatory, CHR = Christmas Island, SAM = Samoa, and SPO = South Pole.

Data from Scripps CO₂ Program.
Last updated March 2009.