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▪ Abstract Carbon dioxide is a radiatively active gas whose atmospheric concentration increase is likely to affect Earth's climate. CO 2 is added to the atmosphere by biomass burning and the combustion of fossil fuels. Some added CO 2 remains in the atmosphere. However, substantial amounts are taken up by the oceans and land biosphere, attenuating the atmospheric increase. Atmospheric O 2 measurements provide one constraint for partitioning uptake rates between the ocean and the land biosphere. Here we review studies of atmospheric O 2 concentration variations and discuss their implications for CO 2 uptake by the ocean and the land biosphere. We compare estimates of anthropogenic carbon fluxes from O 2 studies with estimates from other approaches and examine the contribution of natural ocean carbon fluxes to atmospheric O 2 variations.
Bender et al. (Sun,) studied this question.