A Scalable and Adaptable Solution Framework within Components of the Community Climate System Model

Abstract. A framework for a fully implicit solution method is implemented into (1) the High Order Methods Modeling Environment (HOMME), which is a spectral element dynamical core option in the Community Atmosphere Model (CAM), and (2) the Parallel Ocean Program (POP) model of the global ocean. Both of these models are components of the Community Climate System Model (CCSM). HOMME is a development version of CAM and provides a scalable alternative when run with an explicit time integrator. However, it suffers the typical time step size limit to maintain stability. POP uses a time-split semi-implicit time integrator that allows larger time steps but less accuracy when used with scale interacting physics. A fully implicit solution framework allows larger time step sizes and additional climate analysis capability such as model steady state and spin-up efficiency gains without a loss in scalability. This framework is implemented into HOMME and POP using a new Fortran interface to the Trili...

• Type: Conference
• Year: 2009
• Where: ICCS
• Authors: Katherine J. Evans, Damian W. I. Rouson, Andrew G. Salinger, Mark A. Taylor, Wilbert Weijer, James B. White
• Keywords: Applied Computing, ICCS 2009, Larger Time Step, Time Step, Time Step Sizes