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Poster Title

An efficient and accurate model of sunlight for use in all ACME components

AuthorsMichael J Prather (UCI), Juno Hsu (Unlicensed) (UCI), Alex Veidenbaum (UCI), Alex Nicolau (UCI), Philip Cameron-Smith (Unlicensed) (LLNL)
GroupCoupled
ExperimentAll
Poster CategoryFuture Direction
Submission TypePoster or presentation
Poster Link



Abstract

An alternative module for solar heating is being developed and implemented into ACME  by UC Irvine (Earth System Science and Information & Computer Science) and LLNL.  Based on the recently published Solar-J code (Geosci.Model Dev., doi:10.5194/gmd-2017-27), it represents a high-accuracy solar heating module alternative to RRTMG-SW, providing also a photolysis module for aerosol and gas-phase chemistry.  The increased accuracy comes with increased computational costs (15x), and thus a core part of this proposal is the computer science effort to optimize the backbone code for multi-stream scattering on the new DOE HPC systems.  We have identified several opportunities for 3x to 10x speedups using GPUs and even reduced precision arithmetic.  In parallel, we are pursuing alternative radiation-science optimizations with fewer visible-infrared wavelength bins but lower fidelity (possible 5x speedup). 

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