Author

Kevin J. Egan

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#graph neural networks Oct 2026

Physics-Informed Neural Networks as Differentiable Surrogates for 4D-Variational Data Assimilation

Biogeochemical forecasting requires state estimation methods that accommodate sparse observations, nonlinear dynamics, and discontinuous ecological processes. Four-dimensional variational data assimilation (4D-Var) addresses this challenge but depends on tangent-linear and adjoint models that are costly to derive and m...

Kevin Joseph Egan, Brian Powell · 0 citations

#graph neural networks Sep 2026

Physics-Informed Neural Networks as Differentiable Surrogates for 4D-Variational Data Assimilation

Biogeochemical forecasting requires state estimation methods that accommodate sparse observations, nonlinear dynamics, and discontinuous ecological processes. Four-dimensional variational data assimilation (4D-Var) addresses this challenge but depends on tangentlinear and adjoint models that are costly to derive and ma...

Kevin J. Egan, Brian Powell · 0 citations