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Sekiyama, T. T. and M. Kajino, 2021: Performance of a 250-m grid Eulerian dispersion simulation evaluated at two coastal monitoring stations in the vicinity of the Fukushima Daiichi Nuclear Power Plant. J. Meteor. Soc. Japan, 99, 1089-1098.
https://doi.org/10.2151/jmsj.2021-052
Graphical Abstract Published

Plain Language Summary: A super-high-resolution Eulerian dispersion model is sometimes defeated by a lower-resolution model in the vicinity of emission sources; in that case, a plume augmentation (max pooling) process is effective for the higher-resolution model to improve the statistical scores.
 

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Highlights:

• We examined the performance of Eulerian dispersion models in the vicinity of a pollutant source (3.2 and 17.5 km distant) comparing 250-m and 3-km grid simulations.
• A disadvantage of Eulerian dispersion models is expected to be the artificial numerical diffusion near emission sources, but occasionally the artificial diffusion decreases the undetected error rate.
• Plume augmentation is advantageous to super-high-resolution models to improve statistical scores, which is beneficial for environmental emergency response systems.