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• W4362579144 abstract "Abstract Floating ice shelves that fringe the coast of Antarctica resist the flow of grounded ice into the ocean. One of the key factors governing the amount of flow resistance an ice shelf provides is the rigidity (related to viscosity) of the ice that constitutes it. Ice rigidity is highly heterogeneous and must be calibrated from spatially continuous surface observations assimilated into an ice-flow model. Realistic uncertainties in calibrated rigidity values are needed to quantify uncertainties in ice sheet and sea-level forecasts. Here, we present a physics-informed machine learning framework for inferring the full probability distribution of rigidity values for a given ice shelf, conditioned on ice surface velocity and thickness fields derived from remote-sensing data. We employ variational inference to jointly train neural networks and a variational Gaussian Process to reconstruct surface observations, rigidity values and uncertainties. Applying the framework to synthetic and large ice shelves in Antarctica demonstrates that rigidity is well-constrained where ice deformation is measurable within the noise level of the observations. Further reduction in uncertainties can be achieved by complementing variational inference with conventional inversion methods. Our results demonstrate a path forward for continuously updated calibrations of ice flow parameters from remote-sensing observations." @default.
• W4362579144 created "2023-04-06" @default.
• W4362579144 creator A5034624337 @default.
• W4362579144 creator A5057543254 @default.
• W4362579144 date "2023-04-03" @default.
• W4362579144 modified "2023-10-05" @default.
• W4362579144 title "Variational inference of ice shelf rheology with physics-informed machine learning" @default.
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• W4362579144 doi "https://doi.org/10.1017/jog.2023.8" @default.
• W4362579144 hasPublicationYear "2023" @default.
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