Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 18, issue 21
Articles | Volume 18, issue 21
https://doi.org/10.5194/gmd-18-8129-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-18-8129-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 21
Development and technical paper
 | 
03 Nov 2025
Development and technical paper |  | 03 Nov 2025

Implementation of water tracers in the Met Office Unified Model

Alison J. McLaren, Louise C. Sime, Simon Wilson, Jeff Ridley, Qinggang Gao, Merve Gorguner, Giorgia Line, Martin Werner, and Paul Valdes

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Short summary
We describe a new development in a state-of-the-art computer atmosphere model, which follows the movement of the model’s water. This provides an efficient way to track all the model's rain and snow back to the average location of the evaporative source, as shown in a present-day simulation. The new scheme can be used in simulations of the future to predict how sources of regional rain or snowfall might change owing to human actions, providing useful information for water management purposes.
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