carbon isotope ratio

Ratio of carbon-12 to either of the less common isotopes, carbon-13 or carbon-14, or the reciprocal of one of these ratios; if not specified, the ratio refers to carbon-12/carbon-13. Also known as carbon ratio.

Related terms:

• carbon ratio
• carbon-ratio theory
• carbon-nitrogen-phosphorus ratio
• carbon cycle
• oxygen isotope fractionation
• carbon sequestration
• carbon sink
• carbon pool
• Isotope
• P-E ratio