| ABC |
Atmospheric Brown Cloud |
| ACCENT |
Atmospheric Composition Change European Network of Excellence |
| ACE |
Atmospheric Chemistry Experiment |
| AGAGE |
Advanced Global Atmospheric Gases Experiment |
| AGGI |
Annual Greenhouse Gas Index |
| AGU |
American Geophysical Union |
| AIRS |
Advanced InfraRed Sounder (instrument on NASA’s Aqua satellite) |
| AMAP |
Arctic Monitoring and Assessment Programme |
| AMDAR |
Aircraft Meteorological Data Relay Programme |
| AMIS |
Air Management Information System |
| AOD |
Aerosol Optical Depth |
| AREP |
Atmospheric Research and Environment Programme |
| ASEAN |
Association of South-East Asian Nations |
| ASRC-SUNY |
Atmospheric Sciences Research Centre, State University of New York (SUNY), Albany NY, USA |
| ATMOS |
Atmospheric Trace Molecule Spectroscopy |
| BAPMoN |
Background Air Pollution Monitoring Network |
| BIPM |
Bureau of International Weights and Measures |
| BoM |
Bureau of Meteorology, Melbourne, Australia |
| BSRN |
Baseline Surface Radiation Network |
| CACGP |
Commission for Atmospheric Chemistry and Global Pollution |
| CAPMoN |
Canadian Air and Precipitation Monitoring Network |
| CARIBIC |
Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container |
| CAS |
Commission for Atmospheric Sciences |
| CAS WG |
CAS Working Group on Environmental Pollution and Atmospheric Chemistry (replaced by the JSC OPAG-EPAC) |
| CBS |
Commission for Basic Systems |
| CCalL |
Central Calibration Laboratory |
| CCL |
Central Calibration Laboratory, in most cases host of the designated WMO standard for a particular variable |
| CCN |
Cloud Condensation Nuclei |
| CEOPs |
Coordinated Enhanced Observing Periods |
| CEOS |
Committee on Earth Observation Satellites |
| CFCs |
Chlorofluorocarbons |
| CG |
Congress |
| CGMS |
Coordination Group for Meteorological Satellites |
| CIMO |
Commission for Instruments and Methods of Observation |
| CIPM |
Committee for International Weights and Measures |
| CLAES |
Cryogenic Limb Array Etalon Spectrometer |
| CLIVAR |
Climate Variability and Predictability |
| CLRTAP |
Convention on Long-Range Transboundary Air Pollution |
| CMAR |
CSIRO Marine and Atmospheric Research |
| CMDL |
Climate Monitoring and Diagnostic Laboratory, NOAA (now Global Monitoring Division of the Earth System Research Laboratory, NOAA ESRL) |
| COST |
European Cooperation in the field of Scientific and Technical Research |
| COST715 |
Urban meteorology applied to air pollution problems |
| CRISTA |
CRyogenic Infrared Spectrometers and Telescopes for the Atmosphere |
| CSIRO |
Commonwealth Scientific and Industrial Research Organisation |
| DA |
Data Assimilation |
| DEBITS |
Deposition of Biogeochemically Important Trace Species |
| DLR |
German Aerospace Centre, Oberpfaffenhofen, Wessling, Germany |
| DOAS |
Differential Optical Absorption Spectroscopy |
| DOAS/SAOZ |
Differential Optical Absorption Spectroscopy/Système d’Analyse par Observations Zénithales |
| DQO |
Data Quality Objective |
| EANET |
Acid Deposition Monitoring Network in East Asia |
| EARLINET |
European Aerosol Research Lidar Network to Establish an Aerosol Climatology |
| EC |
Executive Council of WMO |
| EC |
European Commission |
| ECC |
Electro Chemical Sonde |
| ECD |
Electron Capture Detection |
| ECMWF |
European Centre of Medium Range Weather Forecast |
| ECVs |
Essential Climate Variables |
| EEA |
European Environment Agency |
| EGU |
European Geosciences Union |
| EMEP |
Cooperative Programme for Monitoring and Evaluation of the Long-range Transmission of Air Pollutants in Europe |
| EML |
Environmental Measurements Laboratory, New York, USA |
| Empa |
Swiss Federal Laboratories for Materials Testing and Research, Dübendorf, Switzerland |
| ENV |
Environment Division of the Secretariat of the World Meteorological Organization |
| EPAC |
Environmental Pollution and Atmospheric Chemistry |
| ERI |
European Research Infrastructure |
| ESA |
European Space Agency |
| ESRL |
Earth System Research Laboratory, NOAA |
| ETEX |
European Tracer Experiment |
| ET-NRT CDT |
Expert Team on Near-real-time Chemical Data Transfer |
| ET-WDC |
Expert Team World Data Centre |
| EU |
European Union |
| EUROHYDROS |
European Network for Atmospheric Hydrogen observations and studies |
| EUROTRAC |
European Experiment on Transport and Transformation of Environmentally Relevant Trace Constituents in the Troposphere over Europe |
| EUSAAR |
European Supersites for Atmospheric Aerosol Research |
| EUVDB |
European UV Data Base |
| FLUXNET |
International network measuring terrestrial carbon, water and energy fluxes |
| FMI |
Finnish Meteorological Institute |
| FTIR |
Fourier Transform Infrared (Spectroscopy) |
| FUMAPEX |
Integrated Systems for Forecasting Urban Meteorology, Air Pollution and Population Exposure |
| FZ-Jülich |
Forschungszentrum Jülich, Germany |
| GALION |
GAW Aerosol Lidar Observation Network |
| GAMeS |
Global Atmospheric Methane Synthesis |
| GAW |
Global Atmosphere Watch |
| GAW-CCL |
GAW Central Calibration Laboratory |
| GAWSIS |
GAW Station Information System |
| GAWTEC |
GAW Training and Education Centre |
| GC |
Gas Chromatography |
| GCM |
General Circulation Model |
| GCOS |
Global Climate Observing System |
| GEF |
Global Environment Facility |
| GEMS |
Global and regional Earth-system Monitoring using Satellite and in situ data |
| GEO |
Group on Earth Observations |
| GEOMON |
Global Earth Observation and monitoring |
| GEOSS |
Global Earth Observation System of Systems |
| GESAMP |
Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection |
| GHG |
Greenhouse Gas |
| GLOBEC |
Global Ocean Ecosystem Dynamics |
| GMES |
Global Monitoring for Environment and Security |
| GOME |
Global Ozone Monitoring Experiment |
| GOME2 |
Global Ozone Monitoring Experiment 2 |
| GPCP |
Global Precipitation Chemistry Programme |
| GSP |
GAW Strategic Plan |
| GSRN |
Global Surface Radiation Network |
| GTS |
Global Telecommunication System |
| GTT |
GURME Training Team |
| GURME |
GAW Urban Research Meteorology and Environment Project |
| HALOE |
Halogen Occultation Experiment |
| HCFC |
Hydrochlorofluorocarbons |
| HFCs |
Hydrofluorocompounds |
| HTAP |
Hemispheric Transport of Air Pollution |
| IADV |
Interactive Data Visualization |
| IAEA |
International Atomic Energy Agency |
| IAGOS-MOZAIC |
Integration of routine Aircraft Observations into a Global Observing System |
| IAI |
Inter American Institute for Global Change Research |
| IAPSAG |
International Aerosol Precipitation Science Assessment Group |
| ICSU |
International Council for Science |
| ICTT QMF |
Inter-Commission Task Team on Quality Management Framework |
| IFT |
Institute for Tropospheric Research, Leipzig, Germany |
| IFU |
Fraunhofer Institut fur Atmospharishe Umweltforschung, Garmisch-Partenkirchen, Germany |
| IGAC |
International Global Atmospheric Chemistry Project |
| IGACO |
Integrated Global Atmospheric Chemistry Observations |
| IGBP |
International Geosphere-Biosphere Programme |
| IGOS |
Integrated Global Observing Strategy |
| IGY |
International Geophysical Year |
| IHALACE |
International Halocarbon Intercomparison Experiment |
| ILAS |
Improved Limb Atmospheric Spectrometer |
| iLEAPS |
Integrated Land Ecosystem – Atmosphere Processes Study |
| IM |
Inverse Modelling |
| IMBER |
Integrated Marine Biogeochemistry and Ecosystem Research |
| IMK |
Institut Für Meteorologie und Klimatologie |
| IMK-IFU |
Institute for Meteorology and Climate Research of the Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany |
| IMPROVE |
Interagency Monitoring of Protected Visual Environments |
| IOC |
International Ozone Commission |
| IPCC |
Intergovernmental Panel on Climate Change |
| IPET-MI |
Inter-Programme Expert Team on Metadata Implementation |
| IPY |
International Polar Year |
| IRC |
International Radiation Commission |
| ISAP |
International Science Advisory Panel |
| ISO |
International Organization for Standardization |
| ISWS |
Illinois State Water Survey |
| IUGG |
International Union of Geodesy and Geophysics |
| IUPAC |
International Union of Pure and Applied Chemistry |
| IZO |
Izaña Observatory, Tenerife, Spain |
| JGOFS |
Joint Global Ocean Flux Study |
| JMA |
Japan Meteorological Agency |
| JOSIE |
Julich Ozone Sonde Intercomparison Experiments |
| JRC |
Joint Research Centre of the European Commission, Ispra, Italy |
| JSC |
Joint Scientific Steering Committee |
| JSC OPAG-EPAC |
Joint Scientific Committee of the Open Area Programme Group on Environmental Pollution and Atmospheric Chemistry |
| LIDAR |
Light Detection And Ranging |
| LRTAP |
Long-range Transboundary Air Pollution |
| MEDPOL |
Mediterranean Pollution Monitoring and Research Programme |
| MGO |
Main Geophysical Observatory, St Petersburg, Russian Federation |
| MLS |
Microwave Limb Sounder |
| MOHp |
Meteorological Observatory Hohenpeissenberg, Germany |
| MOPITT |
Measurements Of Pollution In The Troposphere |
| MOZAIC |
Measurement of Ozone by Airbus In-service airCraft |
| MSC |
Meteorological Service of Canada- formerly Atmospheric Environment Services (AES), Toronto, Canada |
| NADP |
National Atmospheric Deposition Programme (in the United States of America) |
| NARSTO |
North American Research Strategy for Tropospheric Ozone |
| NASA |
National Aeronautics and Space Administration |
| NCEP |
National Centres for Environmental Prediction |
| NDACC |
Network for the Detection of Atmospheric Composition Change |
| NDSC |
Network for the Detection of Stratospheric Change |
| NH |
Northern Hemisphere |
| NILU |
Norwegian Institute for Air Research |
| NIST |
National Institute of Standards and Technology, Gaithersburg MD, USA |
| NMHS |
National Meteorological and Hydrological Service |
| NOAA |
National Oceanic and Atmospheric Administration, USA |
| NOMHICE |
Non-Methane Hydrocarbon Intercomparison Experiment |
| NRT |
Near-real-time, specifying observations ‘not older than 1-2 hours that can be incorporated into the data assimilation schemes of weather or air quality forecast models’ |
| NSF |
National Science Foundation |
| NWP |
Numerical Weather Prediction |
| OCBA |
Observatorio Central Buenos Aires, Argentina |
| OCO |
Orbiting Carbon Observatory |
| OMI |
Ozone Monitoring Instruments |
| OMPS |
Ozone Mapping and Profiler Suite |
| OPAG |
Open Programme Area Group |
| OSG |
Operations Support Group |
| PC |
Precipitation Chemistry |
| PFR |
Precision filter radiometer |
| PMOD/WRC |
Physikalisch-Meteorologisches Observatorium Davos/World Radiation Centre, Switzerland |
| POAM |
Polar Ozone and Aerosol Measurement |
| POPs |
Persistent organic pollutants |
| QA |
Quality Assurance |
| QA/QC |
Quality Assurance/Quality Control |
| QA/SAC |
Quality Assurance/Science Activity Centre |
| QAPjP |
Quality Assurance Project Plan |
| QASUME |
Quality Assurance of Spectral Measurements in Europe |
| QMF |
Quality Management Framework |
| QMS |
Quality Management System |
| RA |
WMO Regional Association |
| RCC |
Regional Calibration Centre |
| RDCC |
Regional Dobson Calibration Centre |
| RG |
Reactive Gases |
| SAG |
Scientific Advisory Group |
| SAGE |
Stratospheric Aerosol and Gas Experiment |
| SAWS |
South African Weather Service, Pretoria, South Africa |
| SBUV |
Solar Backscatter Ultraviolet Instrument |
| SCIAMACHY |
Scanning Imaging Absorption SpectroMeter for Atmospheric ChartographY |
| SCOUT-O3 |
Stratospheric-Climate links with emphasis On the Upper Troposphere and lower stratosphere |
| SH |
Southern Hemisphere |
| SHADOZ |
Southern Hemisphere Additional Ozonesondes programme |
| SMN |
Servicio Meteorologico Nacional, Argentina |
| SOLAS |
Surface Ocean – Lower Atmosphere Study |
| SOO-HK |
Solar and Ozone Observatory Hradec Kralove, Czech Republic |
| SOOP |
Ship-of-Opportunity Programme, a joint IOC-WMO programme |
| SOPs |
Standard Operating Procedures |
| SPARC |
Stratospheric Processes and Their Role in Climate |
| SRRB |
Surface Radiation Research Branch of NOAA's Air Resources Laboratory (now part of NOAA ESRL) |
| STE |
Stratosphere/Troposphere Exchange |
| SUNY |
State University of New York |
| TCCON |
Total Column Carbon Observing Network |
| TF HTAP |
Task Force on Hemispheric Transport of Air Pollution |
| TOMS |
Total Ozone Mapping Spectrometer |
| UARS |
Upper Atmosphere Research Satellite |
| UBA |
Umweltbundesamt/The Federal Environmental Agency, Germany |
| UFS |
Umweltforschungsstation Schneefernerhaus |
| UNCED |
United Nations Conference on Environment and Development |
| UNDP |
United Nations Development Programme |
| UNECE |
United Nations Economic Commission for Europe |
| UNECE-LRTAP |
United Nations Economic Commission for Europe Convention on Long Range Transboundary Air Pollution |
| UNEP |
United Nations Environment Programme |
| UNESCAP |
United Nations Economic and Social Commission for Asia and the Pacific |
| UNFCCC |
United Nations Framework Convention on Climate Change |
| UV |
Ultraviolet Radiation |
| VCP |
WMO Voluntary Co-operation Programme |
| VOCs |
Volatile Organic Compounds |
| VOS |
Voluntary Observing Ship |
| WCC |
World Calibration Centre |
| WCCAC |
World Calibration Centre for Aerosol Chemistry |
| WCCAP |
World Calibration Centre for Aerosol Physics |
| WCCOS |
World Calibration Centre for Ozone Sondes |
| WCP |
World Climate Programme |
| WCRP |
World Climate Research Programme |
| WDC |
World Data Centre |
| WDCA |
World Data Centre for Aerosols |
| WDCGG |
World Data Centre for Greenhouse Gases |
| WDCPC |
World Data Centre for Precipitation Chemistry |
| WDC-RSAT |
World Data Centre for Remote Sensing of the Atmosphere |
| WHO |
World Health Organization |
| WIDAC |
World Integrated Data Archive Centre |
| WIGOS |
WMO Integrated Global Observing System |
| WIS |
WMO Information System |
| WMO |
World Meteorological Organization |
| WOCE |
World Ocean Circulation Experiment |
| WORCC |
World Optical Depth Research and Calibration Centre |
| WOUDC |
World Ozone and UV Data Centre |
| WRC |
World Radiation Centre |
| WRDC |
World Radiation Data Centre, St Petersburg, Russia |
| WRMC |
World Radiation Monitoring Centre |
| WWRP |
World Weather Research Programme |
| WWW |
World Weather Watch Programme |
