Research Article

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

Figure 13

Time series of absolute errors of for 4D-Var CPE (blue) and EnKF CPE (red) in EXP-4. In panel (a) (panel (b)), values of the observational interval, ensemble size, and MTW are 50 (5) time steps, 100 (10) time steps, and 1000 (50) time steps.
(a)
(b)