The archive is organized into several directories to facilitate navigation and reuse: Training_Guide.pdfIntroductory document presenting the archive and the progression of tutorials. T00_CROCO_INTRO/CROCO presentation and quick refresher on basic Linux commands and the vi editor. T01_CROCO_ENV/Preparation of the CROCO and CROCO_Tools environment on an HPC system. T02_CROCO_GRID/Create your first CROCO grid and explore sigma vertical coordinates. T03_FiniteDiff/Independent activity on finite difference schemes using MATLAB/Octave. T04_CROCO_CLIM/Build your first CROCO configuration with climatological forcings and run the model. T05_Stability/Independent activity on the stability and consistency of numerical schemes (CFL condition). T06_CROCO_NESTING/Run a CROCO configuration with embedded zooms using AGRIF nesting. T07_CROCO_INTER/Configure and run a CROCO simulation forced with interannual datasets. T08_CROCO_RUNOFF/Add river runoff forcing (e.g. Orange and Doring rivers in the Benguela configuration). Tools_and_Scripts/Dedicated scripts and programs used during the training, not included in the official CROCO release: .bashrc_example: adapted for the CHPC Lengau cluster (this hidden file can be listed using ls -a) Example HPC scripts: jobcomp_lengau, run_croco.pbs, run_croco_inter.pbs Specific tools for Tutorials 01, 02, and 03: TP0_test_file.nc, TP0_test_script.m, draw_zonal_section.m, My_diffusion_1D.m Slightly modified CROCO files: create_config.bash, crocoin.m Activity_Solutions/Solutions for the numerical activities in Tutorials 03 and 05.

CROCO Regional Modeling Tutorials — DOI: 10.5281/zenodo.17091356by Serena Illig (LEGOS/IRD, serena.illig@ird.fr) http://sillig.free.fr/Courses_CROCO.html September 2025 These tutorials guide learners through building and running a regional ocean configuration with the CROCO — Coastal and Regional Ocean COmmunity model. The package combines lecture presentations, step‑by‑step hands‑on tutorials, and a set of dedicated scripts and programs used throughout the training. To start: open the document `Training_Guide.pdf`. To extract the training archive: Execute the Linux/Mac command "tar -xzvf CROCO_Tutorials_Sept2025.tar.gz" © 2025 Serena Illig.Tutorials and presentations are licensed under CC BY-NC 4.0.Scripts and code examples are licensed under the MIT License.