We would like to let you know that Oceanography, the official magazine of The Oceanography Society, published its inaugural supplement on ocean observing, entitled "Frontiers in Ocean Observing: Documenting Ecosystems, Understanding Environmental Changes, Forecasting Hazards." Articles in this collection describe new technologies and reveal some exciting results that advance our understanding of the world ocean and its resources and support its sustainable use and management. Topics covered in the supplement align with the priorities of the UN Decade of Ocean Science for Sustainable Development (2021–2030) in the following areas: (1) Ocean-Climate Nexus, (2) Ecosystems and Their Diversity, (3) Ocean Resources and the Economy Under Changing Environmental Conditions, (4) Pollutants and Contaminants and Their Potential Impacts on Human Health and Ecosystems, and (5) Multi-Hazard Warning Systems. The sixth and closing chapter describes several exciting new ocean observing technologies.

The supplement contains several articles related to marine biogeochemistry observations, including contributions from IOCCP SSG and Office members. You can access the whole collection here: https://tos.org/oceanography/issue/volume-34-issue-04-supplement