Search Results for author: Laurent Bertino

Found 4 papers, 0 papers with code

Super-resolution data assimilation

no code implementations4 Sep 2021 Sébastien Barthélémy, Julien Brajard, Laurent Bertino, François Counillon

Increasing the resolution of a model can improve the performance of a data assimilation system: first because model field are in better agreement with high resolution observations, then the corrections are better sustained and, with ensemble data assimilation, the forecast error covariances are improved.

Super-Resolution

Combining data assimilation and machine learning to infer unresolved scale parametrisation

no code implementations9 Sep 2020 Julien Brajard, Alberto Carrassi, Marc Bocquet, Laurent Bertino

Moreover, the attractor of the system is significantly better represented by the hybrid model than by the truncated model.

BIG-bench Machine Learning

Bayesian inference of chaotic dynamics by merging data assimilation, machine learning and expectation-maximization

no code implementations17 Jan 2020 Marc Bocquet, Julien Brajard, Alberto Carrassi, Laurent Bertino

The reconstruction from observations of high-dimensional chaotic dynamics such as geophysical flows is hampered by (i) the partial and noisy observations that can realistically be obtained, (ii) the need to learn from long time series of data, and (iii) the unstable nature of the dynamics.

Bayesian Inference BIG-bench Machine Learning +2

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