CPL6: The New Extensible, High Performance Parallel Coupler for the Community Climate System Model

Coupled climate models are large, multiphysics applications designed to simulate the Earth’s climate and predict the response of the climate to any changes in the forcing or boundary conditions. The Community Climate System Model (CCSM) is a widely used state-of-the-art climate model that has released several versions to the climate community over the past ten years. Like many climate models, CCSM employs a coupler, a functional unit that coordinates the exchange of data between parts of the climate system such as the atmosphere and ocean. In this paper we describe the new coupler, cpl6, contained in the latest version of CCSM, CCSM3. Cpl6 introduces distributed-memory parallelism to the coupler, a class library for important coupler functions, and a standardized interface for component models. Cpl6 is implemented entirely in Fortran90 and uses the Model Coupling Toolkit as the base for most of its classes. Cpl6 gives improved performance over previous versions and scales well on multiple platforms.

[1]  Jay Walter Larson,et al.  The Model Coupling Toolkit: A New Fortran90 Toolkit for Building Multiphysics Parallel Coupled Models , 2005, Int. J. High Perform. Comput. Appl..

[2]  James Demmel,et al.  A Data Broker for Distributed Computing Environments , 2001, International Conference on Computational Science.

[3]  J. Larson,et al.  M × N Communication and Parallel Interpolation in CCSM 3 Using the Model Coupling Toolkit , 2005 .

[4]  G. Kauffman,et al.  The NCAR CSM Flux Coupler , 1996 .

[5]  W. Collins,et al.  The Community Climate System Model: CCSM3 , 2004 .

[6]  Jay Walter Larson,et al.  M × N Communication and Parallel Interpolation in Community Climate System Model Version 3 Using the Model Coupling Toolkit , 2005, Int. J. High Perform. Comput. Appl..

[7]  Philip W. Jones.  First- and Second-Order Conservative Remapping Schemes for Grids in Spherical Coordinates , 1999 .

[8]  P. Gent,et al.  The NCAR Climate System Model, Version One* , 1998 .

[9]  G. Danabasoglu,et al.  The Community Climate System Model Version 4 , 2004 .

[10]  Anthony P. Craig,et al.  The DOE Parallel Climate Model (PCM): The Computational Highway and Backroads , 2001, International Conference on Computational Science.

[11]  John Anderson,et al.  Computational Design and Performance of the Fast Ocean Atmosphere Model, Version One , 2001, International Conference on Computational Science.

[12]  Cecelia DeLuca,et al.  The architecture of the Earth System Modeling Framework , 2003, Computing in Science & Engineering.

[13]  Chris H. Q. Ding,et al.  Coupling Multicomponent Models with MPH on Distributed Memory Computer Architectures , 2005, Int. J. High Perform. Comput. Appl..

[14]  W. G. Strand,et al.  Parallel climate model (PCM) control and transient simulations , 2000 .

[15]  K. Taylor,et al.  The Community Climate System Model , 2001 .