Development of a probabilistic ocean modelling system based on NEMO4.0: a contribution to the SEAMLESS project (deliverable 3.3)

This archive contains the technical implementation of a new probabilistic version of NEMO based on version 4.0 (NEMO website: https://www.nemo-ocean.eu). This includes two components: (i) stochastic parameterizations, to simulate uncertainties in the model (using the algorithm described in Brankart et al., 2015), and (ii) ensemble simulations, with several members running simultaneously in parallel within a single executable (and interacting if needed), as introduced in Bessières et al. (2017). The implementation is kept generic, but the stochastic parameterizations are here focused on uncertainties in the ecosystem component, consistently with the objectives of the SEAMLESS project. The code is based on a previous version by Bessières et al. (2017) based on NEMO3.5 (see zenodo link in the reference). As compared to this previous version, the new features here are: (i) the rewriting of the ensemble simulation code (to adjust to the new NEMO parallelization, which is very different in NEMO4.0 as compared to NEMO3.5), (ii) the inclusion and upgrade of the biogeochemical stochastic parameterizations proposed in Garnier al. (2016), and (iii) the stochastic parameterization of location uncertainties, as developed by Leroux et al. (2022) in NEMO3.6, in the context of the IMMERSE project. See the README file included in the archive for more details. This development has been produced in the framework of the SEAMLESS project (https://www.seamlessproject.org/), to provide a code for stochastic parameterizations to generate ensembles in 1D or 3D MFC configurations (deliverable 3.3). Cite as: Popov M., Brankart J.-M., Molines J.-M., Leroux S., Penduff T., Brasseur P. (2022). Development of a probabilistic ocean modelling system based on NEMO4.0: a contribution to the SEAMLESS project (deliverable 3.3), doi:10.5281/zenodo.6303007-Disclaimer- The authors warn that this sources delivery does not imply warranties and support, they assumes no responsability for problems, errors, or incorrect usage of NEMO. Additional information can be found on nemo-ocean.eu website