The oceanic uptake of anthropogenic CO2 is primarily a physical response to rising atmospheric CO2 concentrations. Whenever the partial pressure of a gas is higher in the atmosphere over a body of water, the gas will diffuse into that water until the partial pressures across the air-water interface are equilibrated. There is no evidence that the rising atmospheric CO2 concentrations have had a measurable impact on biological processes in the ocean. The growth rate of the primary producers in the ocean (phyto plankton) is generally limited by either light or nutrient availability, not carbon. It is possible that climate changes (e.g. ocean temperature or circulation changes) may be affecting the ocean carbon system, but these effects are thought to be small for the 19th and 20th centuries.
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