Summer School on Line: Applied Ocean Modelling using CROCO Advanced Course 2nd week: January 25-29 2021 Version 11/25/2020 Aims and Objectives The course aims at familiarizing the participants with the advanced use of the numerical model of the ocean CROCO. CROCO (Coastal and Regional Community Model http://www.croco-ocean.org ) is based in ROMS_AGRIF and gathers elements from MARS3D, SYMPHONIE-NH, and NEMO. It includes non-hydrostatic capabilities, wet/dry cells, nearshore wave-current interactions, and coupling capabilities with the atmospheric model WRF and the wave model WW3 by using the OASIS coupler. The course will be of an advanced level, presenting in more detail the use of CROCO’s biogeochemical models, CROCO’s capabilities in coupling with an atmospheric (WRF) and wave model (WW3), and aspects of implementing an operational forecast of the ocean with CROCO as the ocean component. This course contributes to the capacity building on numerical tools of the coastal