Held-Suarez simulations with the Community Atmosphere Model Spectral Element (CAM-SE) dynamical core: a global axial angular momentum analysis using Eulerian and floating Lagrangian vertical coordinates
Résumé
In this paper, an analysis of the global AAM conservation properties of NCAR’s Community
Atmosphere Model Spectral Element (CAM-SE) dynamical core under Held-Suarez forcing is presented. It is
shown that the spurious sources/sinks of AAM in CAM-SE are 3 orders of magnitude smaller than the parameterized
(physical) sources/sinks. The effect on AAM conservation by changing various numerical aspects
of the dynamical core (e.g., different vertical coordinates, reduced formal order of accuracy, increased dissipation,
and decreased divergence damping) is investigated. In particular, it is noted that changing from
Eulerian (hybrid-sigma) to floating Lagrangian vertical coordinates does not alter the global AAM conservation
properties of CAM-SE.
Domaines
Planétologie
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Lauritzen_et_al-2014-Journal_of_Advances_in_Modeling_Earth_Systems.pdf (1.7 Mo)
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