Here you can find the list of abbreviations used on the ICOS website and documents.
| ABBREVIATION | FULL NAME |
| 14C | Radiocarbon |
| 14CO2 | Carbon dioxide containing a heavy isotope of carbon |
| AGU | American Geophysical Union |
| ATC | ICOS Atmosphere Thematic Centre |
| CAL | ICOS Central Analytical Laboratory |
| CAMS | Copernicus Atmosphere Monitoring Service |
| CEOS | Earth Observation Satellites |
| CFs | ICOS Central Facilities, i.e., ATC, ETC, OTC, CAL |
| CH4 | Methane |
| CMCC | Euro-Mediterranean Centre on Climate Change |
| CO | Carbon monoxide |
| CO2 | Carbon dioxide |
| COP | The informal name for the Conference of the Parties to the United Nations’ Framework Convention on Climate Change (UNFCCC) |
| CP | ICOS Carbon Portal |
| CRL | Central Radiocarbon Laboratory of CAL |
| DG | Director General of the ICOS RI |
| DOI | Digital Object Identifier |
| EAB | ICOS Ethical Advisory Board |
| EGU | The European Geosciences Union |
| ENVRI | European Environmental Research Infrastructures |
| ERIC | European Research Infrastructure Consortium |
| ESFRI | European Strategy Forum on Research Infrastructures |
| ETC | ICOS Ecosystem Thematic Centre |
| FCL | Flask and Calibration Laboratory of CAL |
| FOS | Fixed Ocean Stations |
| G3W | Global Greenhouse Gas Watch |
| GA | ICOS General Assembly |
| GAW | Global Atmosphere Watch programme (WMO programme) |
| GCOS | Global Climate Observing System |
| GEO | Group on Earth Observations |
| GEO-C | Group on Earth Observations-Carbon |
| GEOSS | Global Earth Observation System of Systems |
| GHGs | Greenhouse gases |
| GLODAP | The Global Ocean Data Analysis Project |
| GNI | Gross National Income |
| GTOS | Global Terrestrial Observing System |
| H2020 | Horizon 2020 (European Union framework programme) |
| HO | ICOS Head Office |
| ICOS | Integrated Carbon Observation System |
| ICOS2020SC | ICOS Science Conference 2020 |
| ICOS RI | ICOS Research Infrastructure |
| IG3IS | Integrated Global Greenhouse Gas Information System |
| IPCC | Intergovernmental Panel on Climate Change |
| ISIC | ICOS Interim Stakeholder Council |
| IW | Internal Working data |
| KPI | Key Performance Indicator |
| MFT | Marine Flux Towers |
| MSAs | Monitoring Station Assemblies for ICOS ERIC Member countries’ Atmosphere station, Ecosystem station and Ocean station networks |
| N2O | Nitrous oxide |
| NNs | ICOS National Networks |
| NOAA | National Oceanic and Atmospheric Administration |
| NRT | Near-real-time |
| OTC | ICOS Ocean Thematic Centre |
| pCO2 | Partial pressure of carbon dioxide in the ocean |
| PI | Principal Investigator of measurement station(s) |
| QA/QC | Quality Assurance/Quality Control |
| RI | Research Infrastructure |
| RICOM | Research Infrastructure COMmittee |
| SAB | Scientific Advisory Board |
| SBSTA | Subsidiary Body for Scientific and Technical Advice |
| SF6 | Sulphur hexafluoride |
| SOCAT | Surface Ocean CO₂ Atlas |
| SOOP | Ship of Opportunity |
| TCs | Thematic Centres for Atmosphere, Ecosystem and Ocean observations (ATC, ETC and OTC) |
| UNFCCC | United Nations’ Framework Convention on Climate Change |
| WMO | World Meteorological Organisation |