The NASA Ocean Biogeochemical Model (NOBM) is a biogeochemical model of the global oceans. THE NOBM was developed by GMAO and is in the process of being coupled to the complex and interactive GEOS-5 climate systems. As currently configured, NOBM is coupled with the Poseidon ocean general circulation model, which requires external forcing fields to run (currently forced by GMAO's MERRA). The model contains 4 explicit phytoplankton taxonomic groups: diatoms, cyanobacteria, chlorophytes, and coccolithophores, to represent the large scale biodiversity of the global oceans. NOBM assimilates SeaWiFS and MODIS total chlorophyll data. More details on NOBM can be found here.