著者
ISHIDA Junichi ARANAMI Kohei KAWANO Kohei MATSUBAYASHI Kengo KITAMURA Yuji MUROI Chiashi
出版者
公益社団法人 日本気象学会
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
pp.2022-043, (Released:2022-07-07)

The non-hydrostatic numerical weather prediction (NWP) model ASUCA developed by the Japan Meteorological Agency (JMA) was launched into operation as 2 and 5 km-resolution regional models in 2015 and 2017, respectively. This paper outlines specifications of ASUCA with focus on the dynamical core and its configuration/accuracy as an operational model. ASUCA is designed for high computational stability and efficiency, mass conservation and forecast accuracy. High computational stability is achieved via a time-split integration scheme to compute acoustic terms and an advection scheme with a flux-limiter function to avoid numerical oscillation. In addition, vertical advection and sedimentation are calculated together with another exclusive time-splitting technique. ASUCA adopts hybrid parallelization using Message Passing Interface (MPI) and Open Multi Processing (OpenMP) for high computational efficiency on massive parallel scalar computers. The three-dimensional arrays are allocated such that the vertical direction is the stride-one innermost dimension to make effective use of cache and multi-thread parallelization. This is particularly advantageous for physical processes evaluated in a vertical column. To ensure mass conservation, density rather than pressure is integrated as a prognostic variable in flux-form fully compressible governing equations. ASUCA exhibited better performance than the previous operational model in idealized and NWP tests.

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New Online Release of JMSJ Vol. 100, No.5 (October 2022): Ishida, J., K. Aranami, K. Kawano, K. Matsubayashi, Y. Kitamura and C. Muroi, 2022: ASUCA: the JMA operational non-hydrostatic model. J. Meteor. Soc. Japan, 100, 825-846. https://t.co/tPqxuFzcaj https://t.co/xJykA8FDNO https://t.co/dflkFMCvy7
New Graphical Abstract now available online. 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. https://t.co/tPqxuFzcaj https://t.co/iAj3FE2Wkw

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