Performance and validation of the YHGSM global spectral model coupled with the WAM model

In this article, we describe an implementation of two-way coupling between the Yin-He Global Spectral Model (YHGSM) and the Wave Model (WAM). The YHGSM atmosphere model gives the surface air water density and 10-m wind for the WAM model, while the WAM model provides the Charnock coefficient as a response. The effects on the meteorological aptitude of the two-way coupled system are assessed statistically. The coupled model exhibits a 75% significant positive impact on both the northern (NthH) and the southern hemisphere (SthH) for all metrics at almost all pressure levels. Typhoon track assessments of the coupled model will be implemented later. The results show that the coupling of the WAM model benefits typhoon landfall prediction. Finally, we make a comprehensive comparison of the significant wave height (SWH) between the YHGSM-WAM coupled model and the European Centre for Medium-Range Weather Forecasts (ECMWF) model with buoy data from the Chinese Ocean Monitoring Network. The comparison shows that the YHGSM-WAM coupled model exhibits more accuracy and predictive stability of SWH forecasts against buoy observations than the ECMWF forecasts. The above results indicate that the YHGSM-WAM coupled model possesses superior performance to uncoupled models.

Automated summary

In this article, the implementation of two-way coupling between the Yin-He Global Spectral Model (YHGSM) and the Wave Model (WAM) is described. The effects of the coupled system on meteorological aptitude are assessed statistically, showing a significant positive impact on both the northern (NthH) and southern hemisphere (SthH). The coupling of the WAM model benefits typhoon landfall prediction and exhibits more accuracy and stability in significant wave height (SWH) forecasts compared to the ECMWF model.