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| Titel |
DYNAMICO-1.0, an icosahedral hydrostatic dynamical core designed for consistency and versatility |
| VerfasserIn |
T. Dubos, S. Dubey, M. Tort, R. Mittal, Y. Meurdesoif, F. Hourdin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 10 ; Nr. 8, no. 10 (2015-10-07), S.3131-3150 |
| Datensatznummer |
250116598
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| Publikation (Nr.) |
 copernicus.org/gmd-8-3131-2015.pdf |
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| Zusammenfassung |
The design of the icosahedral dynamical core DYNAMICO is presented. DYNAMICO
solves the multi-layer rotating shallow-water equations, a compressible
variant of the same equivalent to a discretization of the hydrostatic
primitive equations in a Lagrangian vertical coordinate, and the primitive
equations in a hybrid mass-based vertical coordinate. The common Hamiltonian
structure of these sets of equations is exploited to formulate
energy-conserving spatial discretizations in a unified way.
The horizontal mesh is a quasi-uniform icosahedral C-grid obtained by
subdivision of a regular icosahedron. Control volumes for mass, tracers and
entropy/potential temperature are the hexagonal cells of the Voronoi mesh to
avoid the fast numerical modes of the triangular C-grid. The horizontal
discretization is that of Ringler et al. (2010), whose discrete
quasi-Hamiltonian structure is identified. The prognostic variables are
arranged vertically on a Lorenz grid with all thermodynamical variables
collocated with mass. The vertical discretization is obtained from the
three-dimensional Hamiltonian formulation. Tracers are transported using a
second-order finite-volume scheme with slope limiting for positivity.
Explicit Runge–Kutta time integration is used for dynamics, and
forward-in-time integration with horizontal/vertical splitting is used for
tracers. Most of the model code is common to the three sets of equations
solved, making it easier to develop and validate each piece of the model
separately.
Representative three-dimensional test cases are run and analyzed, showing
correctness of the model. The design permits to consider several extensions
in the near future, from higher-order transport to more general dynamics,
especially deep-atmosphere and non-hydrostatic equations. |
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