Mauna Loa and South Pole Isotopic C13 Ratio Graphic | Scripps CO2 Program

Mauna Loa and South Pole Isotopic 13C Ratio


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.


Data sharing policy

The data and graphics on this website are made freely available, with the understanding that appropriate credit will be given. For applications supporting peer-reviewed scientific publications, coauthorship may sometimes be appropriate. An example would be if an important result or conclusion depends on this product, such as the first account of a previously unreported phenomenon. Ethical usage requires disclosing intentions at early stages of the work in order to avoid duplicating ongoing studies at Scripps. For applications where coauthorship is not needed, which includes all applications outside of the peer-reviewed scientific literature, it is sufficient to acknowledge the Scripps CO2 program as the source. Please direct queries to Ralph Keeling (rkeeling@ucsd.edu)