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Marc Bocquet

source inversion of the European Tracer Experiment (ETEX). This European Joint Researcher Centre 1994 campaign ( Girardi et al. 1998 ) consisted of a pointwise 12-h-long release into the atmosphere of an inert tracer at continental scale. In the papers mentioned earlier, several three-dimensional inversions of the source were attempted successfully on either the synthetic or the real concentration measurements from the campaign. However, these inversions were based on a regular discretization of the

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Hong Li, Eugenia Kalnay, Takemasa Miyoshi, and Christopher M. Danforth

generating good samples of model errors is a challenge to the LDM+. It is not clear whether the model error samples generated from the NNR fields are good enough to represent the true model errors. In practice, we could use a more advanced reanalysis, like the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40; Uppala et al. 2005 ) or the Japanese 25-yr Re-Analysis (JRA-25; Onogi et al. 2007 ) to replace the NNR. We could also verify the analysis against a more

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Gérald Desroziers, Loïk Berre, Vincent Chabot, and Bernard Chapnik

observations. This is likely due to the fact that the European Centre for Medium-Range Weather Forecasts (ECMWF) analysis relies on a larger number of satellite data. The comparison of the DFS with the corresponding numbers of observations shows that the DFS is not simply a question of number, since the weight of Radiosounding observations is proportionally larger than the weight of Brightness temperature observations. This can be interpreted as a lower confidence accorded to the last type of measurements

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