High Resolution Aqua Planet Simulations With the Community Atmospheric Model (CAM) Using the HOMME Spectral Element Dynamical Core

Details High Resolution Aqua Planet Simulations With the Community Atmospheric Model (CAM) Using the HOMME Spectral Element Dynamical Core High Resolution Aqua Planet Simulations With the Community Atmospheric Model (CAM) Using the HOMME Spectral Element Dynamical Core

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.a31h..03t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #A31H-03

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0545 Modeling (4255), 1225 Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556)

Scientific paper

We will describe recent high resolution Aqua planet simulation results from CAM/HOMME, a highly scalable cubed-sphere based atmospheric model that has been integrated into the Community Climate System Model (CCSM). Aqua planet simulations have no known "correct" answer, so we evaluate the simulations using the Williamson equivalent resolution model inter-comparison methodology. Our highest resolution simulations, performed using 56,000 processors of the LLNL BG/L system at 1/8 degree horizontal result ion, show a well resolved Nastrom-Gage type transition from k-3 to k-5/3 in the kinetic energy spectra. CAM/HOMME uses a 4th order spectral element discretization for the dynamics coupled with monotone (2nd order) or sign-preserving (3rd order) advection scheme and a hyper-viscosity term for dissipation. We use a new, "compatible" formulation of the spectral element method, meaning it has discrete analogs of several key properties of the spherical div, grad and curl operators. This allows the method to locally conserve both mass and energy and (in 2D) relative vorticity. The conservation is possible even when the equations are not written in conservation form, making it the first atmospheric model in the CCSM to conserve both mass and energy. The tracer advection is consistent with the hydrostatic mass equation. Monotone or sign-preserving tracer advection is obtained with the spectral element horizontal discretization on vertically Lagrangian surfaces combined with a PPM based vertical remap.

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