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• W2038408857 abstract "This study describes a new global non-hydrostatic dynamical core (ICON-IAP: Icosahedral Nonhydrostatic model at the Institute for Atmospheric Physics) on a hexagonal C-grid which is designed to conserve mass and energy. Energy conservation is achieved by discretizing the antisymmetric Poisson bracket which mimics correct energy conversions between the different kinds of energy (kinetic, potential, internal). Because of the bracket structure this is even possible in a complicated numerical environment with (i) the occurrence of terrain-following coordinates with all the metric terms in it, (ii) the horizontal C-grid staggering on the Voronoi mesh and the complications induced by the need for an acceptable stationary geostrophic mode, and (iii) the necessity for avoiding Hollingsworth instability. The model is equipped with a Smagorinsky-type nonlinear horizontal diffusion. The associated dissipative heating is accounted for by the application of the discrete product rule for derivatives. The time integration scheme is explicit in the horizontal and implicit in the vertical. In order to ensure energy conservation, the Exner pressure has to be off-centred in the vertical velocity equation and extrapolated in the horizontal velocity equation. Test simulations are performed for small-scale and global-scale flows. A test simulation of linear non-hydrostatic flow over a rough mountain range shows the theoretically expected gravity wave propagation. The baroclinic wave test is extended to 40 days in order to check the Lorenz energy cycle. The model exhibits excellent energy conservation properties even in this strongly nonlinear and dissipative case. The Held–Suarez test confirms the reliability of the model over even longer time-scales. Copyright © 2012 Royal Meteorological Society" @default.
• W2038408857 created "2016-06-24" @default.
• W2038408857 creator A5065424440 @default.
• W2038408857 date "2012-06-11" @default.
• W2038408857 modified "2023-10-11" @default.
• W2038408857 title "A global hexagonal C-grid non-hydrostatic dynamical core (ICON-IAP) designed for energetic consistency" @default.
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• W2038408857 doi "https://doi.org/10.1002/qj.1960" @default.
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