Integrated studies of the sensitivity of marine ecosystems and biogeochemical cycles to global change are essential to understand how biogeochemical cycles and marine ecosystems interact together and with the changing global environment and help prepare the responses of society to regional and global marine change. To develop a comprehensive understanding of, and accurate predictive future capacity for, physical, biogeochemical, and ecosystemic ocean responses to accelerating anthropogenic global change on time scales ranging from years to decades, and the consequent marine feedbacks on the Earth System. This IMBER / SOLAS session calls for contributions related to experimental work at sea or in the laboratory, theoretical, modelling and remote sensing studies on the responses of key marine biogeochemical cycles, the structure and functioning of oceanic ecosystems and their interactions with each other and to global change. Contributions dealing with exchange processes at the air-sea interface, with mesoscale and sub-mesoscale processes and associated with oxygen minimum zones are also welcome.