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

<div>Time series of the RMSEs for zonal wind (ms<sup>−1</sup>) at the fourth model level (∼510 hPa) with different ensemble sizes. (a) Ensemble size = 75. (b) Ensemble size = 100. (c) Ensemble size = 125. (d) Ensemble size = 200. Here, 14600 assimilation steps correspond to 10 years from 0000 UTC 1 January 1982 to 0000 UTC 1 January 1992.</div>

Advances in Meteorology

fig5

Figure 5

Figure 5: Modifying Covariance Localization to Mitigate Sampling Errors from the Ensemble Data Assimilation 