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We are honored to receive the 2025 AGU Edward A. Flinn III Award. For over 25 years, we have developed and shared the Regional Ocean Modeling System (ROMS) with the ocean modeling community, which now has thousands of users worldwide. Our work has supported the training and research of the next generation of ocean scientists and operational specialists. Building the advanced capabilities of ROMS truly requires a team. We are grateful to all the multidisciplinary scientists and colleagues who have contributed to ROMS's development, improvement, applications, dissertations, and hundreds of scientific papers in the literature.

We want to express our gratitude to all the collaborators whose contributions have been invaluable. Specifically, Alexander F. Shchepetkin, John C. Warner, and the ROMS Adjoint Group for their assistance with various numerical algorithms. We also appreciate Kate Hedstrom and David Robertson for their help in managing the ROMS user community and developing the necessary cyberinfrastructure. We are grateful for all the support from funding agencies that made this possible. We extend our heartfelt thanks to the nominator(s), the writers who supported the nomination package, and the selection committee for bestowing this honor upon us.

We dedicate this award to the ROMS community— Hernan, Andy, and John.

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Technical Documentation Introduction Equations of Motion Vertical S-coordinate Terrain-Following Coordinate Transformation Curvilinear Coordinates Transformation Fractional Coordinate System (ξ - η space) Time-stepping Schemes Review Numerical Solution Technique Nested Grids Boundary Conditions Horizontal Mixing Vertical Mixing Parameterizations Atmospheric Boundary Layer Bottom Boundary Layer Lagrangian Drifters Balance Term Diagnostics Biogeochemical Models Sediment Model Wave Model Atmospheric Model Model Coupling ROMS Native ESMF/NUOPC Cap ROMS Stand-Alone ESMF/NUOPC Cap Model Diagnostics Sea-Ice Model Variational Data Assimilation ROMS-JEDI Compiling Implementation Observations Unit Test Cases ROMS I/O Bibliography

User Guide Getting Started Tutorials Nesting Examples Frequently Asked Questions Source Code Git Modules Drivers Subroutines Variables Functionals Lateral Boundary Conditions C Preprocessor Options cppdefs.h globaldefs.h Compiling and Linking makefile build_roms my_build_paths make gmake MakeDepend External Libraries Parallelization Benchmarking Matlab Scripts Visualization

Examples and Applications Test Cases Coupling Examples Nesting Examples Application Set-up Metadata Design YAML Parser coupling_esmf_atm.yaml roms_cmeps.yaml varinfo.yaml Grid Generation Initialization Forcing Atmospheric Forcing Tidal Forcing River Runoff Input Parameter Files roms.in s4dvar.in biology.in sediment.in floats.in stations.in ice.in swan.in Standard Output Files

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