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Twin experiments with the equivalent weights particle filter and HadCM3
Author(s) -
Browne P. A.,
van Leeuwen P. J.
Publication year - 2015
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.2621
Subject(s) - data assimilation , filter (signal processing) , particle filter , degeneracy (biology) , anomaly (physics) , mathematics , particle (ecology) , meteorology , computer science , physics , geology , bioinformatics , oceanography , computer vision , biology , condensed matter physics
This article investigates the use of a particle filter for data assimilation with a full‐scale coupled ocean–atmosphere general circulation model. Synthetic twin experiments are performed to assess the performance of the equivalent weights filter in such a high‐dimensional system. Artificial two‐dimensional sea surface temperature fields are used as observational data every day. Results are presented for different values of the free parameters in the method. Measures of the performance of the filter are root mean square errors, trajectories of individual variables in the model and rank histograms. Filter degeneracy is not observed and the performance of the filter is shown to depend on the ability to keep maximum spread in the ensemble.