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- W2166568584 abstract "This article shows how one can formulate the representation problem starting from Bayes' theorem. The purpose of this article is to raise awareness of the formal solutions, so that approximations can be placed in a proper context. The representation errors appear in the likelihood, and the different possibilities for the representation of reality in model and observations are discussed, including nonlinear representation probability density functions. Specifically, the assumptions needed in the usual procedure to add a representation error covariance to the error covariance of the observations are discussed, and it is shown that, when several sub-grid observations are present, their mean still has a representation error; so-called ‘superobbing’ does not resolve the issue. Connection is made to the off-line or on-line retrieval problem, providing a new simple proof of the equivalence of assimilating linear retrievals and original observations. Furthermore, it is shown how nonlinear retrievals can be assimilated without loss of information. Finally we discuss how errors in the observation operator model can be treated consistently in the Bayesian framework, connecting to previous work in this area." @default.
- W2166568584 created "2016-06-24" @default.
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- W2166568584 date "2014-11-27" @default.
- W2166568584 modified "2023-10-17" @default.
- W2166568584 title "Representation errors and retrievals in linear and nonlinear data assimilation" @default.
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- W2166568584 doi "https://doi.org/10.1002/qj.2464" @default.
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