NEMO for Nucleus for European Modelling of the Ocean is a state-of-the-art modelling framework for research activities and forecasting services in ocean and climate sciences, developed in a sustainable way by a European consortium since 2008.

The NEMO ocean model has 3 major components:

• OCE models the ocean [thermo]dynamics and solves the primitive equations (./src/OCE)
• SI3 simulates seaice [thermo]dynamics, brine inclusions and subgrid-scale thickness variations (./src/ICE)
• TOP models the [on|off]line oceanic tracers transport and biogeochemical processes (./src/TOP)

These physical core engines are described in their respective reference documentation that must be cited for any work related to their use.

Not only does the NEMO framework model the ocean circulation, it offers various features to enable

• Create embedded zoom seamlessly thanks to 2-way nesting package AGRIF.
• Opportunity to integrate an external biogeochemistry model
• Versatile data_assimilation (./src/OBS)
• Generation of diagnostics through effective XIOS system
• Roll-out Earth system modeling with coupling interface based on OASIS

Several built-in configurations are provided to evaluate the skills and performances of the model which can be used as templates for setting up a new configurations (./cfgs).

NEMO user can also checkout available idealized test cases that address specific physical processes(./tests).

A set of utilities is also provided to [pre|post]process your data (./tools).

A walkthrough tutorial illustrates how to get code dependencies, compile and execute NEMO (./INSTALL.rst) .

Reference manuals and quick start guide can be build from source and exported to HTML or PDF formats (./doc) or downloaded directly from the NEMO website.

Since 2014 the project has a Special Issue in the open-access journal Geoscientific Model Development (GMD) from the European Geosciences Union (EGU). The main scope is to collect relevant manuscripts covering various topics and to provide a single portal to assess the model potential and evolution.

Used by a wide audience, numerous associated projects have been carried out and extensive bibliography published.

The NEMO Consortium pulling together 5 European institutes (CMCC, CNRS, MOI, Met Office and NERC) plans the sustainable development in order to keep a reliable evolving framework since 2008.

It defines the NEMO strategy that is implemented by the System Team on a yearly basis in order to release a new version almost every four years.

When the need arises, working groups are created or resumed to gather the community expertise for advising on the development activities.