Data used in the production of "Calcifying phytoplankton demonstrate and enhanced role in greenhouse atmospheric CO2 regulation" by K Kvale, W Koeve and N Mengis, GEOMAR Biogeochemical Modelling Department Submitted to Frontiers in Marine Science Special Issue on Calcification Please contact kkvale@geomar.de for details Files included are Netcdf format model output used in the production of plots in the manuscript. Details of the model and methods can be found in the manuscript. Data details are embedded in the netcdf files. 'Greenhouse' directories contain simulation output carried out for 1263 ppm. 'Icehouse' directories contain simulation output carried out at 282 ppm.