The course provides basic knowledge and information of marine biogeochemistry. The contents include: Introduction to marine biogeochemistry and environments, Chemical speciation, composition, solubility and air-sea exchange; Redox chemistry of sea water: Biological and geochemical cycling; Nutrient cycling, speciation and their budgets in the ocean; CO2 system, alkalinity, calcite distribution and pH; Trace metals and primary production; the Iron Hypothesis; Marine organics and their role in chemical speciation and in processes affecting the fate of elements in the oceans; Topic studies of the seas around Taiwan. The unit will be taught through lectures and group seminars. Extensive use will be made of video material, and group activities.