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Multiscale Representation of Observation Error Statistics in Data Assimilation

Vincent Chabot 1, 2 Maëlle Nodet 1, 3 Arthur Vidard 1
1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows
Inria Grenoble - Rhône-Alpes, UGA - Université Grenoble Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
Abstract : Accounting for realistic observation errors is a known bottleneck in data assimilation, because dealing with error correlations is complex. Following a previous study on this subject, we propose to use multiscale modelling, more precisely wavelet transform, to address this question. This study aims to investigate the problem further by addressing two issues arising in real-life data assimilation: how to deal with partially missing data (e.g., concealed by an obstacle between the sensor and the observed system), and how to solve convergence issues associated with complex observation error covariance matrices? Two adjustments relying on wavelets modelling are proposed to deal with those, and offer significant improvements. The first one consists of adjusting the variance coefficients in the frequency domain to account for masked information. The second one consists of a gradual assimilation of frequencies. Both of these fully rely on the multiscale properties associated with wavelet covariance modelling. Numerical results on twin experiments show that multiscale modelling is a promising tool to account for correlations in observation errors in realistic applications.
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Submitted on : Friday, December 20, 2019 - 4:13:44 PM
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Vincent Chabot, Maëlle Nodet, Arthur Vidard. Multiscale Representation of Observation Error Statistics in Data Assimilation. Sensors, MDPI, 2020, 20 (5), pp.20. ⟨10.3390/s20051460⟩. ⟨hal-02421699v1⟩

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