ESMO was created to coordinate, advance, and facilitate all modelling, data assimilation and observational activities within WCRP, working jointly with all other WCRP projects and providing strategic connections to related external programmes.

It follows a seamless and value-chain approach across all Earth system components, disciplines, and scales.

Through both modelling of the Earth system and real-world observations, we gather valuable information about climate change. This information is crucial for helping communities plan for their future, assessing how climate change might impact different areas, and creating policies to address it.

We aim to help people understand why the climate is changing and what it means for our world – from our cities and economies to our way of life and the environment. To tackle climate change effectively, we need to look at the big picture of how our planet works. For instance, we study how carbon, energy, and water move through our environment because they're all connected to climate change.

By working together and sharing data, we can better understand and address these complex issues.

To achieve this, four main working groups contribute to the mission of ESMO and support its activities: the Working Group on Coupled Modelling (WGCM), the Working Group on Subseasonal to Interdecadal Prediction (WGSIP), the Working Group on Numerical Experimentation (WGNE) and the Working Group on Observations for Researching Climate (WGORC, in progress).

The ESMO Structure