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The Use of Rank Histograms and MVL Diagrams to Characterize Ensemble Evolution in Weather Forecasting
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The Use of Rank Histograms and MVL Diagrams to Characterize Ensemble Evolution in Weather Forecasting
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Journal Article
The Use of Rank Histograms and MVL Diagrams to Characterize Ensemble Evolution in Weather Forecasting
2010
Overview
Rank Histograms are suitable tools to assess the quality of ensembles within an ensemble prediction system or framework. By counting the rank of a given variable in the ensemble, we are basically making a sample analysis, which does not allow us to distinguish if the origin of its variability is external noise or comes from chaotic sources. The recently introduced Mean to Variance Logarithmic （MVL） Diagram accounts for the spatial variability, being very sensitive to the spatial localization produced by infinitesimal perturbations of spatiotemporal chaotic systems. By using as a benchmark a simple model subject to noise, we show the distinct information given by Rank Histograms and MVL Diagrams. Hence, the main effects of the external noise can be visualized in a graphic. From the MVL diagram we clearly observe a reduction of the amplitude growth rate and of the spatial localization （chaos suppression）, while from the Rank Histogram we observe changes in the reliability of the ensemble. We conclude that in a complex framework including spatiotemporal chaos and noise, both provide a more complete forecasting picture.
Publisher
SP Science Press,Springer Nature B.V
Subject
