Abstract: In Wahba et al. it was shown how the randomized trace method could be used to adaptively tune numerical weather prediction models via generalized cross validation (GCV) and related methods. In this paper a ?toy? four-dimensional ...

Abstract: In variational data assimilation, optimal ingestion of the observational data, and optimal use of prior physical and statistical information involve the choice of numerous weighting, smoothing, and tuning parameters that ...