The paper “Comparison of Traditional and Hybrid Forms of Optimal Localisation for Mitigation of Sampling Error in Ensemble Kalman Filters“, co-authored by Rebecca Atkinson, (former PhD student at Surrey) Jonathan Flowerdew (UK Met Office), Sue Hughes (Engineering, Surrey), and Ian Roulstone, has been published in Tellus. The paper is published open access and freely available (link here). The screenshot below shows Figure 1 from the paper.