An implementation of single-precision fast spherical harmonic transform in Yin-He global spectral model

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.

Automated summary

This article presents an implementation of single-precision fast spherical harmonic transform (SHT) in the YHGSM, exploring the potential of using single-precision arithmetic to accelerate fast SHT. Results show that single-precision fast SHT can improve computational efficiency without impacting forecast skill.