Across this period, ocean researchers pursued integrated measurements of carbon fluxes and optical properties to illuminate carbon cycling in marine systems. The work emphasized quantitative assessments of organic carbon in sediments, in situ productivity measurements, and seawater chemistry models, uniting biogeochemical processes with physical-chemical frameworks. Optical analyses and the study of organic aggregates emerged as key connectors between particle dynamics, light climate, and carbon transport, establishing a cohesive research program.