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06/20/2023
The Conditioning of Hybrid Variational Data Assimilation
In variational assimilation, the most probable state of a dynamical syst...
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05/20/2021
On preconditioning the state formulation of incremental weak constraint 4D-Var
Using a high degree of parallelism is essential to perform data assimila...
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01/18/2021
Randomised preconditioning for the forcing formulation of weak constraint 4D-Var
There is growing awareness that errors in the model equations cannot be ...
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10/16/2020
The conditioning of least squares problems in preconditioned variational data assimilation
Data assimilation algorithms combine prior and observational information...
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08/21/2019
Spectral estimates for saddle point matrices arising in weak constraint four-dimensional variational data assimilation
We consider the large-sparse symmetric linear systems of equations that ...
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10/25/2018