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Separating the natural and anthropogenic air‐sea flux of CO2: The Indian Ocean

We estimate the natural and anthropogenic components of the air‐sea flux of CO2 in the Indian Ocean. The increase in atmospheric CO2 driven by human activity has caused the air‐sea CO2 disequilibrium, and consequently the flux, to increase significantly over the industrial era. We estimate the flux in the year 1780 to be approximately 0.2 Gt/yr, increasing by 0.26 Gt/yr to 0.5 Gt/yr in 2000. The estimate of the natural (preindustrial) flux is highly sensitive to uncertainties in modern‐day CO2 disequilibrium measurements. By contrast, the estimate of the anthropogenic flux is only weakly sensitive to these measurements.