Ecodynamic and Eddy-Admitting Dimethyl Sulfide Simulations in a Global Ocean Biogeochemistry/Circulation Model

The authors describe planetary-scale modeling of mixed-layer dimethyl sulfide (DMS) processing and distributions, conducted at a resolution of 0.288 using the Parallel Ocean Program (POP). Ecodynamic routines embedded within POP track the interactions of bacteria, multiple phytoplankton species, zooplankton, and both dissolved and detrital organics. Biogeochemistry linked to the ecosystem includes full elemental cycling for iron, nitrogen, silicon, carbon, and the portion of the sulfur cycle leading through the formation of intracellular dimethyl sulfoniopropionate (DMSP) to dissolved DMS. The two reduced sulfur compounds are emitted from the numerical plant bins at average rates proportional to the taxonomically dependent DMSP content. Within the water column they are subjected to photolysis,