The Impact of Length-Scale Variation When Diagnosing the Standard Deviations of Background Error in a 4D-Var System and Filtering Method Investigation

<div>The noise of the vorticity standard deviation field at 1000 hPa calculated from 50 samples and the corresponding energy spectrum (first row), 100 samples (second row), and 200 samples (third row).</div>

Advances in Meteorology

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Figure 2

Figure 2: The Impact of Length-Scale Variation When Diagnosing the Standard Deviations of Background Error in a 4D-Var System and Filtering Method Investigation 

Figure 2 | The Impact of Length-Scale Variation When Diagnosing the Standard Deviations of Background Error in a 4D-Var System and Filtering Method Investigation 