Domain Decomposition-Based Parallel Software for Data Assimilation in the Mediterranean Sea

OceanVar is a data assimilation (DA) software which is being used in Italy within the Mediterranean Forecasting System (MFS) to combine observational data (SLA, SST, Argo-floats profiles) with backgrounds produced by computational models of ocean currents of the Mediterranean Sea (namely, the NEMO framework). OceanVAR implements a three-dimensional variational scheme. We discuss the design of a fully parallel version of OceanVar, based on domain decomposition approach, which is able to face to the ever greater multi-level parallelism and scalability of the current and the next generation of leadership computing facility systems (multi processors, many core and GPUs), while fulfilling the specific requirements of OceanVar within the MFS