Latitude versus depth simulations of ecodynamics and dissolved gas chemistry relationships in the central pacific

Nutrient ecology and trace gas processing are intimately coupled in the sur face ocean and participate in key linkages through the Earth biogeochemical system. We have added water column photochemistry for volatile sulfur and organic compounds to large scale nutrient cycle modules, in order to create a one dimensional, open ocean ecochemistry simulator. Phyto- and zooplankt on, recyclers and biological waste products are represented through N and F e densities. Dimethyl sulfide, carbonyl sulfide and the methyl halides are tracked individually along with certain precursors and nonmethane hydrocarb ons. The model is applied along the 180 degree meridian in the Northern Hem isphere. Ecodynamics are validated against satellite ocean color maps. Biol ogical/photochemical production terms are then iterated upon to match measu red distributions for the trace gases. Data are most complete for dimethyl sulfide. Major patterns in its climatology are captured within individual e cological provinces. However, at the basin scale reduced sulfur release mus t be varied over almost an order of magnitude because the mechanism develop ed contains only one plant taxon. Based on sparser data, first order rate c onstants are estimated for phytoplanktonic exudation of the methyl halides. Parameters are also established for photolytic injection of carbonyl sulfi de and propylene from the dissolved organics. Ocean general circulation mod els and interactive ocean-atmosphere transport simulations are discussed as frameworks for future application.