Isotope fractionation at the soil-atmosphere interface and the 18O budget of atmospheric oxygen

Details Isotope fractionation at the soil-atmosphere interface and the 18O budget of atmospheric oxygen Isotope fractionation at the soil-atmosphere interface and the 18O budget of atmospheric oxygen

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114202a&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14202

Mathematics

Logic

1

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Geochemistry: Isotopic Composition/Chemistry, Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions, Oceanography: Biological And Chemical: Stable Isotopes

Scientific paper

The stable isotope composition of atmospheric oxygen links the carbon and water cycles of the earth and allows the estimation of changes in terrestrial and marine productivities under different climate regimes. Calculated isotope composition of atmospheric oxygen, however, is nearly three per mil lower than that observed, with the lower value attributed mostly to uncertainties in the isotopic composition of leaf moisture. Here we present an experimental model to show that a previously neglected process accompanying oxygen transport in the terrestrial subsurface may induce a large fractionation at the soil-atmosphere interface. This additional fractionation is sufficient to reconcile the differences between observed and calculated values of the isotopic composition of atmospheric oxygen and provides self-consistent 18O budgets for atmospheric O2 and CO2. Our results contribute to a better understanding of processes controlling the isotope composition of atmospheric oxygen under present and past climates.

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