Monitoring our planet’s climate is critically important for understanding levels of global warming and our ability to address it. To anticipate the challenges that the changing climate will bring, and develop mitigation strategies for coping with them, we need reliable climate forecasts. Climate models rely on key indicators of the state of our climate: essential climate variables, or ECVs. These are a set of physical, chemical and biological variables described by the Global Climate Observing System (GCOS) exactly for this purpose.

The climate section covers the measurement challenges and metrological contribution to in situ and remote sensing measurements of ECVs associated with the three themes of the network: Atmosphere, Ocean, and Land & Earth Observation (EO).