A simple method for integrating a complex model into an ensemble data assimilation system using MPI

Browne, P. A. and Wilson, S. (2015) A simple method for integrating a complex model into an ensemble data assimilation system using MPI. Environmental Modelling & Software, 68. pp. 122-128. ISSN 1364-8152 doi: 10.1016/j.envsoft.2015.02.003

Abstract/Summary

This paper details a strategy for modifying the source code of a complex model so that the model may be used in a data assimilation context, {and gives the standards for implementing a data assimilation code to use such a model}. The strategy relies on keeping the model separate from any data assimilation code, and coupling the two through the use of Message Passing Interface (MPI) {functionality}. This strategy limits the changes necessary to the model and as such is rapid to program, at the expense of ultimate performance. The implementation technique is applied in different models with state dimension up to $2.7 \times 10^8$. The overheads added by using this implementation strategy in a coupled ocean-atmosphere climate model are shown to be an order of magnitude smaller than the addition of correlated stochastic random errors necessary for some nonlinear data assimilation techniques.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/39246
Identification Number/DOI	10.1016/j.envsoft.2015.02.003
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	Elsevier
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