Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 20
Articles | Volume 19, issue 20
https://doi.org/10.5194/gmd-19-10309-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-19-10309-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 20
Development and technical paper
 | 
29 Oct 2026
Development and technical paper |  | 29 Oct 2026

Using a two-stage Rosenbrock solver to increase computational efficiency in the DOE's Exascale Earth System Model version 1 (E3SMv1)

Rong-You Chien and Joshua S. Fu

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Short summary
We implemented a two-stage Rosenbrock solver (ROS2) in E3SMv1 and evaluated it with two atmospheric chemistry mechanisms. At a 180 s timestep, ROS2 reduced chemistry integration time by ~33% versus the original implicit solver on Cori/KNL CPUs, while maintaining stable one-year simulations and small ozone differences (≤1.03 ppb). Species-dependent differences in ozone, NO, NO2, and OH were small. Results support ROS2 as a lower-cost option, with further convergence and CPU/GPU testing needed.
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