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Neural-Network-based Kalman Filters for the Spatio-Temporal Interpolation of Satellite-derived Sea Surface Temperature
Abstract : In this work we address the reconstruction of gap-free Sea Surface Temperature (SST) fields 1 from irregularly-sampled satellite-derived observations. We develop novel Neural-Network-based 2 (NN-based) Kalman filters for spatio-temporal interpolation issues as an alternative to ensemble 3 Kalman filters (EnKF). The key features of the proposed approach are twofold: the learning of 4 a probabilistic NN-based representation of 2D geophysical dynamics, the associated parametric 5 Kalman-like filtering scheme for a computationally-efficient spatio-temporal interpolation of Sea 6 Surface Temperature (SST) fields. We illustrate the relevance of our contribution for an OSSE 7 (Observing System Simulation Experiment) in a case-study region off South Africa. Our numerical 8 experiments report significant improvements in terms of reconstruction performance compared with 9 operational and state-of-the-art schemes (e.g., optimal interpolation, Empirical Orthogonal Function 10 (EOF) based interpolation and analog data assimilation).
Cited literature [3 references]
https://hal-imt-atlantique.archives-ouvertes.fr/hal-01896654
Contributor : Said Ouala Connect in order to contact the contributor
Submitted on : Tuesday, October 16, 2018 - 12:31:27 PM
Last modification on : Tuesday, January 4, 2022 - 3:44:06 AM
Contributor : Said Ouala Connect in order to contact the contributor
Submitted on : Tuesday, October 16, 2018 - 12:31:27 PM
Last modification on : Tuesday, January 4, 2022 - 3:44:06 AM
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