The Ocean Model for E3SM Global Applications (OMEGA)

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Authors

Lead Presenter

Luke Van Roekel - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Co-Author

Mark Petersen - Los Alamos National Laboratory

Steven Brus - Argonne National Laboratory (ANL)

Xylar Asay-Davis - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Carolyn Begeman - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Philip Jones - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Brian O'Neill - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Maciej Waruszewski - Sandia National Laboratories (SNL)

Youngsung Kim - Oak Ridge National Laboratory (ORNL)

Hyun Kang - Oak Ridge National Laboratory (ORNL)

Azamat Mametjanov - Argonne National Laboratory (ANL)

Erin Thomas - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Olawale Ikuyajolu - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Alice Barthel - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Kat Smith - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

LeAnn Conlon - Fluid Dynamics and Solid Mechanics Los Alamos National Laboratory Los Alamos NM USA

Abstract

The Ocean Model For E3SM Global Applications (OMEGA) will become the new ocean and wave component of E3SM in version 4. Previous efforts to port MPAS-Ocean to GPUs with openACC pragmas has not resulted in sufficient performance gains on emerging HPC architectures and previous choices in the MPAS-Ocean framework yielded great flexibility, but diminished computational performance. Thus, OMEGA was born. OMEGA will retain the same unstructured mesh geometry and base numerical methods (e.g. Thuburn et al 2009) as the current Model for Prediction Across Scales-Ocean (MPAS-Ocean), but is being written in C++ to optimize the base performance of the model, clarify the underlying framework, and most importantly take advantage of libraries that enable improved GPU performance (Kokkos, Trott et al, 2022). In addition to the ocean model updates, the OMEGA team is working to completely rebuild the wave component of E3SM (WAVEWATCH III) as a part of OMEGA. In this effort, costly wave source terms will either be ported to C++/Kokkos, or replaced with more efficient AI versions. In this talk, progress to date will be discussed and a calendar of delivery dates for the broader ecosystem will also be discussed.

Related Meeting/Event

EESM PI Meeting 2024

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