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| BGC-Argo | |
|---|---|
| Name | BGC-Argo |
| Type | Autonomous observing network |
| Established | 2016 |
| Operators | International consortium |
| Area | Global oceans |
| Instruments | Biogeochemical sensors, CTD, floats |
BGC-Argo BGC-Argo is a global array of autonomous profiling floats designed to measure biogeochemical properties of the Atlantic Ocean, Pacific Ocean, Indian Ocean, Southern Ocean, and Arctic Ocean. It complements physical observing systems such as Argo (oceanography), Global Ocean Observing System, and NOAA platforms to provide sustained data for oceanography, climate, and ecosystem studies. The program integrates efforts from institutions including Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, National Oceanic and Atmospheric Administration, and CSIRO.
BGC-Argo instruments profile temperature, salinity, dissolved oxygen, nitrate, pH, chlorophyll, and backscatter across the Pacific Ocean Gyre, Gulf Stream, Kuroshio Current, Agulhas Current, and polar water masses such as the Antarctic Circumpolar Current and Beaufort Sea. The network augments long-term programs like Global Drifter Program, Argo (oceanography), and JCOMM to enable studies related to the El Niño–Southern Oscillation, Pacific Decadal Oscillation, Atlantic Meridional Overturning Circulation, and Southern Annular Mode. Participating organizations include University of Washington, Lamont–Doherty Earth Observatory, Plymouth Marine Laboratory, GEOMAR, and IFREMER.
Conceptual roots trace to early autonomous profiler deployments by Scripps Institution of Oceanography and trial biogeochemical floats developed by Woods Hole Oceanographic Institution and MBARI in collaboration with NASA and NSF. Pilot projects occurred in regions studied by HOT (Hawaii Ocean Time-series), BATS (Bermuda Atlantic Time-series Study), PIRATA, and the COMMUNITY of ocean observing research groups. Funding and coordination expanded through initiatives supported by European Commission, Horizon 2020, USAID, NOAA Climate Program Office, and national agencies such as NIWA, CNRS, and CNR. Deployment scaled during international workshops hosted by IOC of UNESCO and guided by strategies from Group on Earth Observations.
Floats employ sensor suites integrating technologies from manufacturers and labs including Aanderaa, Seabird Electronics, WET Labs, Sunburst Sensors, Seabird SBE, Satlantic, and university groups at University of Miami, University of Maine, and University of Tasmania. Core capabilities include CTD packages derived from designs at Lamont–Doherty Earth Observatory and oxygen optodes developed from Aanderaa and Sea-Bird innovations. Chemical sensors measure nitrate using technologies advanced at Ifremer and LOCEAN, while pH sensors derive from developments at CNRS and MBARI. Floats communicate via ARGOS (satellite system) and Iridium networks and use energy management advances pioneered at NASA Jet Propulsion Laboratory and ESA.
Operational deployments coordinate regional observing systems such as SOOP, GO-SHIP, IIOE-2, and CLIVAR cruises from research vessels including R/V Knorr, R/V Investigator, RRS James Clark Ross, RV Polarstern, and RV Tangaroa. Float programs follow protocols developed by the Argo Data Management Team, JCOMMOPS, and regional nodes like Euro-Argo ERIC. Maintenance and redeployment are informed by campaigns run by NOAA Pacific Marine Environmental Laboratory, NIWA, Australian Antarctic Division, and CMA (China Meteorological Administration). Field operations intersect with studies from SCOR, PICES, ICES, and SOLAS.
Data flow uses pipelines established by Argo (oceanography), EMODnet, Copernicus Marine Environment Monitoring Service, and national data centers such as NCEI and BODC. Quality control follows protocols from IOCCP, SCOR, and WMO standards. Gridded products and model assimilation inform systems including ECCO (oceanography), HYCOM, NEMO, CMEMS, and climate models from IPCC assessments. Data support biogeochemical reanalysis efforts led by ECMWF and research groups at Princeton University, MIT, University of Exeter, and Imperial College London.
BGC-Argo data have been used to quantify carbon uptake and export related to the Global Carbon Project, constrain air–sea CO2 flux estimates in studies tied to the Keeling Curve observatory, and reveal oxygen minimum zone dynamics relevant to Peruvian upwelling and Arabian Sea hypoxia. Results have informed analyses of phytoplankton variability in regions of the North Atlantic Bloom, Equatorial Pacific, and Southern Ocean seasonal productivity. Findings contribute to understanding processes linked to ocean acidification, deoxygenation, nutrient cycling in the North Pacific Subtropical Gyre, and mesoscale features such as eddies documented by Jason (satellite), TOPEX/Poseidon, and Sentinel missions. Studies leveraging BGC-Argo have been published by researchers at Scripps Institution of Oceanography, WHOI, Lamont–Doherty Earth Observatory, University of California, San Diego, and University of Tasmania in journals like Nature, Science, Geophysical Research Letters, and Journal of Geophysical Research.
Governance involves partnerships among international bodies including IOC of UNESCO, GOOS, Argo (oceanography), and regional infrastructures such as Euro-Argo ERIC and MERCATOR Ocean. Collaborations span universities and agencies: Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, CSIR, NIWA, IFREMER, GEOMAR, JAMSTEC, KORDI, CNR, CNRS, NASA, and NOAA. Capacity-building and training have engaged programs from SCOR, PICES, IOC Training and Capacity Development Section, and initiatives funded by Horizon Europe and national science foundations. The initiative contributes to assessments by IPCC, the United Nations Framework Convention on Climate Change, and the Global Ocean Observing System.