A Stochastic Covariance Shrinkage Approach to Particle Rejuvenation in the Ensemble Transform Particle Filter. - Andrey A. Popov; Amit N. Subrahmanya; Adrian Sandu (CoRR, 2021)

Adjoint-Matching Neural Network Surrogates for Fast 4D-Var Data Assimilation. - Austin Chennault; Andrey A. Popov; Amit N. Subrahmanya; Rachel Cooper; Anuj Karpatne; Adrian Sandu (CoRR, 2021)

An Ensemble Variational Fokker-Planck Method for Data Assimilation. - Amit N. Subrahmanya; Andrey A. Popov; Adrian Sandu (CoRR, 2021)

Randomized Preconditioned Solvers for Strong Constraint 4D-Var Data Assimilation. - Amit N. Subrahmanya; Vishwas Rao; Arvind K. Saibaba (CoRR, 2024)

Preserving Nonlinear Constraints in Variational Flow Filtering Data Assimilation. - Amit N. Subrahmanya; Andrey A. Popov; Reid Gomillion; Adrian Sandu (CoRR, 2024)

Ensemble variational Fokker-Planck methods for data assimilation. - Amit N. Subrahmanya; Andrey A. Popov; Adrian Sandu (J. Comput. Phys., 2025)