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- W4383342070 abstract "Global reanalyses are routinely used to assess the state of the climate and to evaluate the ongoing climate change. The ERA5 global reanalysis has been compared against a high-resolution regional reanalysis (COSMO-REA6) by means of scale-separation diagnostics based on 2d Haar discrete wavelet transforms. Validation and inter-comparison of reanalysis products lead to a better understanding of their strengths and weaknesses, for a more robust interpretation of climate studies. The presented method builds upon existing methods and enables the assessment of bias, error and skill for individual spatial scales, separately.  The energy scale-separation verification diagnostics (square-root energy, energy percentages, and their normalized bias) enable to assess the bias across the scales and differences in the scale structure of the reanalysis products. A new skill score (evaluated against random chance) and the Symmetric Bounded Efficiency are introduced. These are compared to the Nash-Sutcliffe and the Kling-Gupta Efficiencies, evaluated on different scales, and the benefits of symmetric statistics are illustrated. We illustrate the enhanced diagnostic capabilities of the introduced scale-separation diagnostics while comparing ERA5 control and ensemble members to COSMO-REA6 precipitation reanalyses. Furthermore, the Symmetric Bounded Efficiency enables the comparison of gridded datasets with different resolutions, without penalizing the -more noisy- finer resolution products. As expected, the wavelet statistics show that the coarser resolution ERA5 products underestimate small-to-medium scale precipitation compared to COSMO-REA6. The newly introduced skill score shows that the ERA5 control member, despite its higher variability, exhibits better skill in representing small-to-medium scales with respect to the smoother ensemble members. The Symmetric Bounded Efficiency is suitable for the inter-comparison of reanalyses, since it is invariant with respect to the order of comparison." @default.
- W4383342070 created "2023-07-07" @default.
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- W4383342070 date "2023-07-06" @default.
- W4383342070 modified "2023-10-03" @default.
- W4383342070 title "Scale separation diagnostics and the Symmetric Bounded Efficiency for the inter-comparison of precipitation reanalyses" @default.
- W4383342070 doi "https://doi.org/10.5194/ems2023-68" @default.
- W4383342070 hasPublicationYear "2023" @default.
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