This dataset provides model output from idealized NEMO-PISCES simulations on the ORCA1 configuration. The output includes five 80-years simulations: (1) a control run with pre-industrial CO₂ concentrations (CTL), (2) a simulation with a 1% increase in atmospheric CO₂ per year (CO2), (3) a simulation just like CO2 but with a 1% increase in riverine DOC delivery (DOC), (4) a simulation just like DOC but with a 1% increase in riverine C_T delivery (DIC), and (5) a simulation just like DIC but with a 1% increase in riverine nutrient delivery (NUT). The provided variables are annually averaged surface pH, surface aragonite saturation state, depth-integrated C_T, air-to-sea CO₂ flux,  and depth-integrated net primary production.