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\chapter*{Abstract / R\'{e}sum\'{e}}

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\small{ 
The ocean engine of NEMO (Nucleus for European Modelling of the Ocean) is a primitive equation model adapted to regional and global ocean circulation problems. It is intended to be a flexible tool for studying the ocean and its interactions with the others components of the earth climate system (atmosphere, sea-ice, biogeochemical tracers, ...) over a wide range of space and time scales. Prognostic variables are the three-dimensional velocity field, a linear or non-linear sea surface height, the temperature and the salinity. In the horizontal direction, the model uses a curvilinear orthogonal grid and in the vertical direction, a full or partial step $z$-coordinate, or $s$-coordinate, or a mixture of the two. The distribution of variables is a three-dimensional Arakawa C-type grid. Various physical choices are available to describe ocean physics, including TKE and KPP vertical physics. Within NEMO, the ocean is interfaced with a sea-ice model (LIM), passive tracer and biogeochemical models (TOP) and, via the OASIS coupler, with several atmospheric general circulation models. 

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Le moteur oc\'{e}anique de NEMO (Nucleus for European Modelling of the Ocean) est un mod\`{e}le aux \'{e}quations primitives de la circulation oc\'{e}anique r\'{e}gionale et globale. Il se veut un outil flexible pour \'{e}tudier sur un vaste spectre spatiotemporel l'oc\'{e}an et ses interactions avec les autres composantes du syst\`{e}me climatique terrestre (atmosph\`{e}re, glace de mer, traceurs biog\'{e}ochimiques...). Les variables pronostiques sont le champ tridimensionnel de vitesse, une hauteur de la mer lin\'{e}aire ou non, la temperature et la salinit\'{e}. La distribution des variables se fait sur une grille C d'Arakawa tridimensionnelle utilisant une coordonn\'{e}e verticale $z$ \`{a} niveaux entiers ou partiels, ou une coordonn\'{e}e s, ou encore une combinaison des deux. Diff\'{e}rents choix sont propos\'{e}s pour d\'{e}crire la physique oc\'{e}anique, incluant notamment des physiques verticales TKE et KPP . A travers l'infrastructure NEMO, l'oc\'{e}an est interfac\'{e} avec un mod\`{e}le de glace de mer, des mod\`{e}les biog\'{e}ochimiques et de traceur passif, et, via le coupleur OASIS, \`{a} plusieurs mod\`{e}les de circulation g\'{e}n\'{e}rale atmosph\'{e}rique. 
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\chapter*{Disclaimer}

Like all components of NEMO, the ocean component is developed under the CECILL license, which is a French adaptation of the GNU GPL (General Public License). Anyone may use it freely for research purposes, and is encouraged to communicate back to the NEMO team its own developments and improvements. The model and the present document have been made available as a service to the community. We cannot certify that the code and its manual are free of errors. Bugs are inevitable and some have undoubtedly survived the testing phase. Users are encouraged to bring them to our attention. The author assumes no responsibility for problems, errors, or incorrect usage of NEMO.

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NEMO reference in papers and other publications is as follows:
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Madec, G., 2008: NEMO ocean engine. \textit{Note du P\^ole de mod\'{e}lisation}, Institut Pierre-Simon Laplace (IPSL), France, \colorbox{yellow}{NXX, 193pp}.\\

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Additional information can be found on www.locean-ipsl.upmc.fr/NEMO
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