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Gruber & Keeling 2001
Gruber, N. and Keeling, C.D. (2001). An improved estimate of the isotopic air-sea disequilibrium of CO2: Implications for the oceanic uptake of anthropogenic CO2. Geophysical Research Letters 28: doi: 10.1029/2000GL011853. issn: 0094-8276.

We reevaluate the isotopic air-sea disequilibrium of CO2 on the basis of a new high-quality global data set of surface observations of the reduced isotopic ratio 13C) of dissolved inorganic carbon (DIC). We find a global mean isotopic air-sea disequilibrium of 0.62¿0.10 permil for 1990. Inserting our estimate into an anthropogenic 13C budget for the period from 1985 to 1995 yields an oceanic uptake of 1.5¿0.9 Pg C yr-1, within the range of most other estimates. The large uncertainty of this estimate could be reduced with (i) better characterization of the surface ocean variability in Δ13C, (ii) improved knowledge of the air-sea gas exchange coefficient, and (iii) a significant reduction in the uncertainty associated with the air-land biosphere disequilibrium. ¿ 2001 American Geophysical Union

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Abstract

Keywords
Oceanography, Biological and Chemical, Carbon cycling, Oceanography, Biological and Chemical, Stable isotopes
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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