[A-CG34] Projection and detection of global environmental change

[ACG34-02] E3SM Ocean and Wave Modeling at Exascale

★Invited Papers

*Luke P Van Roekel¹, Steven Brus², Mark Petersen¹, Phil Jones¹, Erin Thomas¹, Olawale Ikuyajolu¹ (1.Los Alamos National Laboratory, 2.Argonne National Laboratory)

Keywords:ocean, waves, exascale, earth system modeling

The primary goal of the Energy Exascale Earth System Model (E3SM) project is to create a model that runs efficiently on emerging exascale resources to enable high resolution modeling for U.S. Department of Energy (DoE) mission questions. Pushing the resolution frontier requires a radical reevaluation of traditional climate modeling approaches. In this presentation we discuss recent advances in the ocean (the Model for Prediction Across Scales - Ocean; MPAS-Ocean) and wave (WAVEWATCH III) components of E3SM. Our efforts span computational and physical modeling approaches. In the ocean component, we have begun a complete redesign of the model to better leverage hybrid architectures using C++ and performance portability programming models. We are also pursuing several advances to the underlying physics, including a new energetically consistent vertical mixing closure. In the wave component efforts are underway to develop a wave model amenable for climate scale integrations through high performance computing and machine learning parameterization of computationally expensive wave source terms. Sea state dependent fluxes and wave-sea ice interactions have also recently been implemented. We close with a brief discussion of some future directions for E3SM.