Research Article
The Impact of Length-Scale Variation When Diagnosing the Standard Deviations of Background Error in a 4D-Var System and Filtering Method Investigation
Figure 7
The vorticity standard deviation field at 1000 hPa estimated from (a) 1000 samples, (b) 50 samples, (c) filtered 50 samples with , and (d) spatially averaged 50 samples with the averaging length L = 500 km.
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