ADM: Atmospheric Dynamics Mission
AMDAR: Aircraft Meteorological Data Relay
BSRN: Baseline Surface Radiation Network
CESAR: Cabauw Experimental Site for Atmospheric Research
EG-CLIMET: European Ground-Based Observations of Essential Variables or Climate and Operational Meteorology
EARLINET: European Aerosol Research Lidar Network to Establish an Aerosol Climatology
GCOS: Global Climate Observing System
GAW: Global Atmospheric Watch
GEOSS: Global Earth Observation System of Systems
GMES: Global Monitoring for Environment and Security
GOS: Global Observing System
GPS: Global Positioning System
GRUAN: GCOS Reference Upper Air Network
GTOS: Global Terrestrial Observing System
IGOS: Integrated Global Observing Strategy
MWR: MicroWave Radiometer
MWRnet: An international network of MicroWave Radiometers
TOPROF: Towards Operational ground-based PROFiling with ceilometers, doppler lidars and microwave radiometers
UNEP: United Nations Environment Programme
UNFCCC: United Nations Framework Convention on Climate Change
WIGOS: WMO Integrated Global Observing System of Systems
WMO: World Meteorological Organization