Atmospheric moisture tracking with WAM2layers v3

Kalverla, Peter; Benedict, Imme; Weijenborg, Chris; van der Ent, Ruud J.

doi:https://doi.org/10.5194/gmd-18-4335-2025

Articles | Volume 18, issue 14

https://doi.org/10.5194/gmd-18-4335-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-18-4335-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 14

Model description paper

|

18 Jul 2025

Model description paper |

| 18 Jul 2025

Atmospheric moisture tracking with WAM2layers v3

Peter Kalverla, Imme Benedict, Chris Weijenborg, and Ruud J. van der Ent

Supplement

https://doi.org/10.5194/gmd-18-4335-2025-supplement

Data sets

ERA5 data West Europe 2021 July for WAM2layers I. Benedict and C. Weijenborg https://doi.org/10.4121/f9572240-f179-4338-9e1b-82c5598529e2.v1

ERA5 data West Africa 1998 July and August for WAM2layers T. Gaasbeek and R. J. Van der Ent https://doi.org/10.4121/bbe10a2a-39dc-4098-a69f-0f677d06ecdd.v2

Model code and software

WAM2layers R. J. Van der Ent et al. https://doi.org/10.5281/zenodo.7010594

WAM2layers R. J. Van der Ent et al. https://github.com/WAM2layers/WAM2layers

Short summary

We introduce a new version of WAM2layers (Water Accounting Model – 2 layers), a computer program that tracks how the weather brings water from one place to another. It uses data from weather and climate models, whose resolution is steadily increasing. Processing the latest data had become a challenge, and the updates presented here ensure that WAM2layers runs smoothly again. We also made it easier to use the program and to understand its source code. This makes it more transparent, reliable, and easier to maintain.