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| Global Argo | |
|---|---|
| Name | Global Argo |
| Caption | Argo profiling float deployment |
| Formation | 1999 |
| Purpose | Ocean observation |
| Region served | Global oceans |
| Parent organization | International Argo Programme |
Global Argo is an international ocean observing effort that deploys profiling floats across the world's oceans to measure temperature, salinity, and other variables in the upper 2,000 meters. The program supports climate research, operational oceanography, and marine ecosystem studies by producing near-real-time and delayed-mode datasets used by agencies and institutions worldwide. It builds on collaborations among national programs, intergovernmental bodies, and research centers to maintain a sustained, global observing system.
The Argo array delivers standardized in situ measurements that inform analyses at organizations such as the World Meteorological Organization, Intergovernmental Oceanographic Commission, National Oceanic and Atmospheric Administration, European Commission, European Space Agency, and National Aeronautics and Space Administration. Data feed into centers including the Global Ocean Data Assimilation Experiment, NOAA National Centers for Environmental Prediction, Copernicus Marine Service, Met Office, Japan Meteorological Agency, Bureau of Meteorology (Australia), and Canadian Meteorological Centre. Key users include researchers at the Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, GEOMAR Helmholtz Centre for Ocean Research Kiel, Plymouth Marine Laboratory, Institut Pierre-Simon Laplace, New Zealand National Institute of Water and Atmospheric Research, CSIRO, Chinese Academy of Sciences, Indian National Centre for Ocean Information Services, and Korea Ocean Research and Development Institute. Operational programs such as Argo Canada, Euro-Argo, Japan Argo and China Argo coordinate deployments alongside research vessels like the R/V Roger Revelle, RRS James Clark Ross, RV Investigator, and RV Tangaroa.
Early conceptual roots trace to global observing initiatives including the Global Ocean Observing System and the World Climate Research Programme workshops that set requirements adopted by panels such as the Argo Steering Team and CLIVAR. The first prototype floats were tested during campaigns associated with TOGA and WOCE, while field validation involved cruises from NOAA Ship Ronald H. Brown and institutions like Scripps Institution of Oceanography. Key milestones include the 2000 international planning meeting at IOC/SCOR Working Group venues, deployment milestones celebrated at meetings in Brest, Monaco, and Plymouth, and integration into programs managed by Jcomm and GOOS. National investments from United States, France, Japan, Australia, United Kingdom, Canada, China, India, Brazil, South Africa, Norway, Germany, South Korea, Chile, Spain, Italy, Portugal, Netherlands, Belgium, Sweden, Finland, Denmark, Ireland, New Zealand, Mexico, Argentina expanded coverage into previously under-sampled basins including the Southern Ocean, Indian Ocean, Atlantic Ocean, Pacific Ocean, and marginal seas such as the Mediterranean Sea.
Profiling floats were developed by manufacturers and labs linked to Teledyne Webb Research, PROVOR, NKE Instrumentation, Sea-Bird Scientific, Aanderaa Data Instruments, Saildrone, IFREMER, CNES, MBARI, CSIR, JAMSTEC, NIWA, CSIRO Marine Laboratories, WHOI Engineering Division, and Scripps Instrument Development. Standard Argo floats carry sensors from companies like Sea-Bird Electronics for conductivity-temperature-depth measurements and biogeochemical modules from MBARI and Plymouth Marine Laboratory for oxygen, nitrate, pH, and chlorophyll. Mission profiles are coordinated with satellite missions including TOPEX/Poseidon, Jason-1, Jason-3, Sentinel-3, SMOS, and CryoSat to enable cross-validation with altimetry, radiometry, and gravimetry data used by groups such as AVISO, EUMETSAT, and NASA JPL.
Floats autonomously cycle between surface and depth, producing profiles transmitted via satellite networks like Iridium, Argos, and Inmarsat to data centers including the Argo Global Data Assembly Centers, Copernicus Marine Environment Monitoring Service, NOAA National Data Buoy Center, Scripps Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) groups, and national repositories. Real-time quality control procedures draw on standards endorsed by the International Council for Science, IOCCP, and the Argo Data Management Team; delayed-mode calibrations involve crosschecks against the Global Ocean Ship-based Hydrographic Investigations Program and climatologies such as World Ocean Atlas and PHC (Polar Science Center Hydrographic Climatology). Data assimilation uses systems like NEMO, HYCOM, ROMS, MITgcm, FVCOM, Ensemble Kalman Filter frameworks at centers such as ECMWF, NOAA GFS, Met Office Unified Model, and JMA.
Argo datasets underpin studies by authors affiliated with Nature, Science (journal), Geophysical Research Letters, Journal of Physical Oceanography, Climate Dynamics, Paleoceanography, and Journal of Geophysical Research: Oceans on topics including heat uptake quantified for the Intergovernmental Panel on Climate Change assessments, ocean heat content trends related to El Niño–Southern Oscillation, Pacific Decadal Oscillation, Atlantic Multidecadal Oscillation, Arctic amplification linked to Arctic Council analyses, and Southern Ocean processes relevant to Commission for the Conservation of Antarctic Marine Living Resources. Applications span fisheries management used by Food and Agriculture Organization, storm surge forecasting for National Hurricane Center, maritime safety in coordination with International Maritime Organization, and carbon cycle studies informing IPCC carbon budget assessments.
Governance relies on international coordination through the International Argo Programme, the Argo Steering Team, JCOMM panels, and national programs funded by agencies such as NOAA, NSF, European Commission Horizon 2020, UK Research and Innovation, CNRS, DFG, NSFC, Indian Ministry of Earth Sciences, Australian Research Council, and ministries of science across participating states. Funding partners include philanthropic and multilateral organizations like the Gordon and Betty Moore Foundation, World Bank projects, and regional consortia including Euro-Argo ERIC and bilateral agreements between institutions such as Scripps Institution of Oceanography and Ifremer.
Current challenges include extending coverage under ice via collaborations with International Thwaites Glacier Collaboration, increasing biogeochemical sensors to meet demands from SOLAS and IMBeR, addressing biofouling and sensor drift identified by groups such as IOCCP and GO-SHIP, and ensuring sustained funding amid shifting priorities at agencies like NOAA and ECMWF. Future directions emphasize integration with autonomous platforms including gliders, unmanned surface vehicles, and Argo Deep enhancements to sample below 2,000 meters, partnerships with satellite constellations by ESA and NASA, and data fusion efforts with reanalysis products produced by ECMWF, NCEP, and CMCC to support climate services for initiatives such as UNFCCC and regional stakeholders like Small Island Developing States.