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- Title
Technical Note: Isotopic corrections for the radiocarbon composition of CO2 in the soil gas environment must account for diffusion and diffusive mixing.
- Authors
Egan, Jocelyn E.; Bowling, David R.; Risk, David A.
- Abstract
Earth system scientists working with radiocarbon in organic samples use a stable carbon isotope (δ13C) correction to account for mass-dependent fractionation, but it has not been evaluated for the soil gas environment, wherein both diffusive gas transport and diffusive mixing are important. Using theory and an analytical soil gas transport model, we demonstrate that the conventional correction is inappropriate for interpreting the radioisotopic composition of CO2 from biological production because it does not account for important gas transport mechanisms. Based on theory used to interpret δ13C of soil production from soil CO2 , we propose a new solution for radiocarbon applications in the soil gas environment that fully accounts for both mass-dependent diffusion and mass-independent diffusive mixing.
- Subjects
SOIL composition; CARBON isotopes; ENVIRONMENTAL soil science; DIFFUSION; EARTH scientists; SOIL air
- Publication
Biogeosciences, 2019, Vol 16, Issue 16, p3197
- ISSN
1726-4170
- Publication type
Article
- DOI
10.5194/bg-16-3197-2019