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

Figure 13

(a) RMSE of temperature versus 24-hour forecast time at 500 hPa. (b–e) RMSE of temperature versus 48 h, 72 h, 96 h, and 120 h forecast time at 500 hPa, respectively. (f) The mean RMSE.

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