ISIMIP3a ocean physical and biogeochemical input data [GFDL-MOM6-COBALT2 dataset]

The GFDL-MOM6-COBALT2 dataset is based on a 50-year ocean simulation using an enhanced resolution, global ocean physical-biogeochemical model incorporated with temporally changing river freshwater and nutrient fluxes (Liu et al., 2021). The ocean physical model used in this study was configured from the 6th generation of the Modular Ocean Model (MOM6) and its accompanying 2nd generation Sea Ice Simulator (SIS2) both developed at the NOAA Geophysical Fluid Dynamics Laboratory [Adcroft et al., 2019]. The model grid used in our simulations has a nominal horizontal resolution of 0.25° or approximately 25 km. MOM6 is integrated with the GFDL’s Carbon, Ocean Biogeochemistry and Lower Trophics (COBALTv2) ocean biogeochemical model [Stock et al., 2020]. The 33-tracer COBALT model simulates global-scale dynamics of carbon, nitrogen, phosphorus, iron, and oxygen, along with three explicit phytoplankton (small, large, and N2-fixing) groups and three explicit zooplankton groups by size. The temporally changing river freshwater and nutrient fluxes used in MOM6-COBALTv2 are derived from long-term simulation of GFDL’s land-watershed model LM3-TAN (Land Model version 3 with Terrestrial and Aquatic Nitrogen) [Lee et al., 2019].