Dierdre Toole teaches this session of MIT's Marine Chemistry (12.742, Fall 2006), covering how the atmosphere and ocean exchange energy and material. She works through atmospheric structure and composition, aerosol formation and behavior, radiation balance, and the biogeochemical cycles that link marine and atmospheric chemistry. The lecture builds from basic atmospheric layering and gas composition toward how aerosols and radiative processes shape climate-relevant exchanges at the sea surface, tying these physical and chemical mechanisms back to the ocean's role in global elemental cycling. Running 77 minutes, it is a straightforward classroom recording aimed at students already familiar with foundational chemistry and oceanography, part of MIT OpenCourseWare's selected recordings from the course.