NEMOTAM: tangent and adjoint models for the ocean modelling platform NEMO

Arthur Vidard (1) , Pierre-Antoine Bouttier (2) , Franck Vigilant (1)

1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows
2 LGGE - Laboratoire de glaciologie et géophysique de l'environnement

Tangent linear and adjoint models (TAMs) are efficient tools to analyse and to control dynamical systems such as NEMO. They can be involved in a large range of applications such as sensitivity analysis, parameter estimation or the computation of characteristic vectors. A TAM is also required by the 4D-Var algorithm, which is one of the major methods in data assimilation. This paper describes the development and the validation of the tangent linear and adjoint model for the NEMO ocean modelling platform (NEMOTAM). The diagnostic tools that are available alongside NEMOTAM are detailed and discussed, and several applications are also presented.

Domaines: Sciences de l'environnement; Analyse numérique [math.NA]

Arthur Vidard, Pierre-Antoine Bouttier, Franck Vigilant. NEMOTAM: tangent and adjoint models for the ocean modelling platform NEMO. Geoscientific Model Development, 2015, 8, pp.1245-1257. ⟨10.5194/gmd-8-1245-2015⟩. ⟨insu-01164710⟩