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Title: Non-asymptotic analysis of ensemble Kalman updates: effective dimension and localization

Journal Article · · Information and Inference (Online)

Many modern algorithms for inverse problems and data assimilation rely on ensemble Kalman updates to blend prior predictions with observed data. Ensemble Kalman methods often perform well with a small ensemble size, which is essential in applications where generating each particle is costly. This paper develops a non-asymptotic analysis of ensemble Kalman updates, which rigorously explains why a small ensemble size suffices if the prior covariance has moderate effective dimension due to fast spectrum decay or approximate sparsity. Here, we present our theory in a unified framework, comparing everal implementations of ensemble Kalman updates that use perturbed observations, square root filtering and localization. As part of our analysis, we develop new dimension-free covariance estimation bounds for approximately sparse matrices that may be of independent interest.

Research Organization:
Univ. of Chicago, IL (United States); University of Chicago, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
SC0022232
OSTI ID:
2274698
Journal Information:
Information and Inference (Online), Journal Name: Information and Inference (Online) Journal Issue: 1 Vol. 13; ISSN 2049-8772
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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