Modifying Covariance Localization to Mitigate Sampling Errors from the Ensemble Data Assimilation

Figure 7

The spatial distributions of the time-mean analysis spread instead of analysis RMSEs for zonal wind from 0000UTC 1 March 1982 to 0000 UTC 1 April 1982 with different ensemble sizes, and (a), (b) ensemble size = 75; (c), (d) ensemble size = 100; (e), (f) ensemble size = 125; (g), (h) ensemble size = 200. (a), (c), (e), and (g) refer to the analysis result from the CL, and (b), (d), (f), and (h) refer to the analysis result from the CL-MC.