International Journal of High Performance Computing Applications

 

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International Journal of High Performance Computing Applications, Vol. 19, No. 3, 309-327 (2005)
DOI: 10.1177/1094342005056117

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

Anthony P. Craig

Climate and Global Dynamics Division National Center for Atmospheric Research Boulder, CO 80305, USA

Robert Jacob

Mathematics and Computer Science Division Argonne National Laboratory Argonne, IL 60439, USA, jacob{at}mcs.anl.gov

Brian Kauffman

Climate and Global Dynamics Division National Center for Atmospheric Research Boulder, CO 80305, USA

Tom Bettge

Scientific Computing Division National Center for Atmospheric Research Boulder, CO, 80305, USA

Jay Larson

Mathematics and Computer Science Division Argonne National Laboratory Argonne, IL 60439, USA

Everest Ong

Mathematics and Computer Science Division Argonne National Laboratory Argonne, IL 60439, USA

Chris Ding

Computational Research Division Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA

Yun He

Computational Research Division Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA

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.

Key Words: Parallel coupler • CCSM • climate modeling • coupled models


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