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Ishida, J., K. Aranami, K. Kawano, K. Matsubayashi, Y. Kitamura, C. Muroi, 2022: ASUCA: the JMA operational non-hydrostatic model. J. Meteor. Soc. Japan, 100, 825-846.
https://doi.org/10.2151/jmsj.2022-043
Graphical Abstract

Plain Language Summary: Japan Meteorological Agency (JMA) developed the non-hydrostatic numerical weather prediction (NWP) model named ASUCA. This paper outlines specifications of ASUCA with focus on the dynamical core and its configuration/accuracy as an operational model. ASUCA exhibited better performance than the previous operational model in idealized and NWP tests.

Highlights:

• ASUCA employs the third-order advection scheme with the flux-limiter function to preserve monotonicity and time-splitting techniques for the acoustic terms to achieve high computational stability.
• The dynamical core of ASUCA satisfies total mass conservation due to employing the flux-form total density equation with finite volume method.
• ASUCA is optimized for massive parallel scalar computers and designed so that computation, communication and disk-I/O are overlapped as much as possible.