著者
DUEBEN Peter D. WEDI Nils SAARINEN Sami ZEMAN Christian
出版者
Meteorological Society of Japan
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
pp.2020-016, (Released:2020-03-17)

Global simulations with 1.45 km grid-spacing are presented that were performed with the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts (ECMWF). Simulations are uncoupled (without ocean, sea-ice or wave model), using 62 or 137 vertical levels and the full complexity of weather forecast simulations including recent date initial conditions, real-world topography, and state-of-the-art physical parametrizations and diabatic forcing including shallow convection, turbulent diffusion, radiation and five categories for the water substance (vapour, liquid, ice, rain, snow). Simulations are evaluated with regard to computational efficiency and model fidelity. Scaling results are presented that were performed on the fastest supercomputer in Europe - Piz Daint (Top 500, Nov 2018). Important choices for the model configuration at this unprecedented resolution for the IFS are discussed such as the use of hydrostatic and non-hydrostatic equations or the time resolution of physical phenomena which is defined by the length of the time step. Our simulations indicate that the IFS model — based on spectral transforms with a semi-implicit, semi-Lagrangian time-stepping scheme in contrast to more local discretisation techniques — can provide a meaningful baseline reference for O(1) km global simulations.

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Interested whether global storm-resolving weather predictions will soon be possible and whether they will really make a difference? Have a look at our latest paper on IFS simulations with 1.45 km grid spacing. https://t.co/igKeoIwthx
New Graphical Abstract! https://t.co/8erFr2waAr Dueben, P. D., N. Wedi, S. Saarinen, and C. Zeman, 2020: Global simulations of the atmosphere at 1.45 km grid-spacing with the Integrated Forecasting System. JMSJ, 98, Special Edition on DYAMOND, https://t.co/9BgW8ODSzE. https://t.co/vfL8Pu5Bmm

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