Graphical Abstract

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Oizumi, T., K. Saito, J. Ito, T. Kuroda, and L. Duc, 2018: Ultra-high-resolution numerical weather prediction with a large domain using the K Computer: A case study of the Izu Oshima heavy rainfall event on October 15-16, 2013. J. Meteor. Soc. Japan, 96, 25-54.
https://doi.org/10.2151/jmsj.2018-006   Graphical Abstract with highlights

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Highlights:

• In experiments with a large domain, the experiments with the Deardorff scheme (Exps_DD: grid spacings of 2 km, 500 m, and 250 m) showed better reproducibility of the rainband position than the ones with the Mellor–Yamada–Nakanishi–Niino scheme (Exps_MYNN: grid spacings of 5 km, 2 km, and 500 m).
• Exps_DD simulated distinct convective-scale up/downdraft pairs on the southeast/northwest sides of the front, whereas Exps_MYNN were not clear. Exps_DD yielded stronger cold pools near the surface than did Exps_MYNN. These differences in the boundary layer structures likely had a large impact on the position of the front and the associated rainband.
• An experiment with a small domain exhibited a very different appearance of the rainband to that with the large domain. However, with one-way nesting procedure, the experiment with the small domain could reproduce similar rainfall distribution to those with the large domain.