An implementation of single‐precision fast spherical harmonic transform in Yin–He global spectral model
Fukang Yin, Junqiang Song, Jianping Wu, Weimin Zhang
Abstract
Abstract In this article, we describe an implementation of single‐precision fast spherical harmonic transform (SHT) in the Yin–He global spectral model (YHGSM). The potential of single‐precision arithmetic is explored for accelerating fast SHT. In particular, we assess the impact of using single‐precision fast SHT on the meteorological skill of YHGSM. Compared to double‐precision SHT, single‐precision fast SHT against is accelerated by about 59.83%, whereas the run‐time reduction achieved 25.28% in model integration for T L 2047L137. The simulation results indicate that single‐precision fast SHT can improve computational efficiency without a noticeable impact on the forecast skill.
Topics & Concepts
Accuracy and precisionHarmonicComputer scienceAlgorithmReduction (mathematics)Double-precision floating-point formatMathematicsPhysicsAcousticsStatisticsFloating pointGeometryMeteorological Phenomena and SimulationsClimate variability and modelsHydrology and Drought Analysis