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S. Mahadevan
Poster TitleImproving climate model coupling through a complete mesh representation
Authors

Vijay

M, Iulian Grindeanu, Robert Jacob, Jason Sarich (Unlicensed)

First AuthorVijay M
Session TypeE3SM Session
Session IDE7
Submission Typeposter
GroupCoupled Infrastructure/Coupler (CMDV)
Experiment
Poster Link




Abstract

The typical climate computational workflow involves evaluation and serialization of the remapping weights during the pre-processing step (using ESMF, SCRIP or TempestRemap), which is then consumed by the coupled driver infrastructure (MCT) during simulation to compute coupled solution field projections. However, such decoupled processes present a two step process presents several hurdles in terms of the scientific workflow, and impede impedes research productivity. In order to overcome these limitations, we present a fully integrated infrastructure within E3SM, based on the Mesh Oriented datABase (MOAB) library, which allows for a complete description of the component numerical grids, and solution data used in each submodel. The Fortran compatible interfaces in MOAB, coupled linked with TempestRemap , are is used in E3SM to enable scalable online remapping strategies without a need for an a separate offline step. We demonstrate the computational efficiency of these remapping algorithms in comparison with other state-of-science tools, and present strong scaling results on large-scale machines for computing projection weights between the spectral-element atmosphere (HOMME) and finite-volume discretizations on the polygonal ocean grids (MPAS).

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