Marine ecosystems are tightly controlled by ocean circulation and rapidly changing in response to climate change. This course discusses the processes that shape and structure ocean ecosystems, with a focus on ocean turbulence and fine-scale dynamics, and climate. The course balances overview lectures, discussion of the current and classic literature on the topic, and data analysis using observations and ocean/climate model outputs. Students participate in seminar type presentations and discussions, and work in group to present a final project based on observational data and/or ocean modeling.