1] Physical transport processes of carbon, alkalinity, heat, and nutrients to a large extent control the partial pressure of CO 2 at the sea surface and hence the oceanic carbon uptake. Using a state-of-the-art biogeochemical model of the North Atlantic at eddy-permitting resolution we show that biases in the simulated circulation generate errors in air-sea fluxes of CO 2 which are still larger than those associated with the considerable uncertainties in parameterizations of the air-sea gas exchange. A semiprognostic correction method that adiabatically corrects the momentum equations while conserving water mass properties and tracers is shown to yield a more realistic description of the carbon fluxes into the North Atlantic at little additional computational cost. Owing to upper ocean flow patterns in better agreement with observations, simulated CO 2 uptake in the corrected regional model is larger by 25% compared to the uncorrected model. Citation: Eden, C., and A. Oschlies (2006), Adiabatic reduction of circulation-related CO 2 air-sea flux biases in a North Atlantic carbon-cycle model, Global Biogeochem. Cycles, 20, GB2008, doi:10.1029/2005GB002521.