Mauna Loa and South Pole Isotopic Ratio

Download this File
Size	Type	Download
99.51 KB	pdf

Description:
Black Dots: Monthly average reduced isotopic ratio of atmospheric carbon dioxide, δ¹³C, versus time at Mauna Loa Observatory, Hawaii (20°N, 156°W) where δ¹³C is in per mil.

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

Red Dots: Monthly average atmospheric carbon dioxide reduced isotopic ratio, δ¹³C, versus time at South Pole, Antarctica where δ¹³C is in per mil.

Red Curve: The sum of 4 seasonal harmonics and a spline function to the South Pole δ¹³C data. The seasonal harmonics include a linear gain factor, to represent increasing amplitude with time.

Data from Scripps CO₂ Program.
Last updated March 2009.