A Study of Coupling Parameter Estimation Implemented by 4D-Var and EnKF with a Simple Coupled System

Figure 6

Time series (20–90 TUs) of the absolute errors of (a) and (b) in the 4D-Var CPE with the observational interval and the minimization time window being 10 and 500 time steps. Here, the red and blue curves represent the results in EXP-1 and EXP-4, respectively.

(a)

(b)