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

Abstract

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.

A Fast Forward Modelling Method for Simulating Satellite Observations Using Observing Path Tracking

“…In view of the method of simulating satellite observations along the observing path tracking of Bormann et al [15], which only considers the observing path tracking integral of the atmospheric upgoing radiation, in this paper, a new method has been developed to simulate the upgoing and downgoing radiation synchronously, using the observing path tracking method. The global forecast variables of YHGSM with a resolution of 15 km [20] and CMA-GFS in 25 km grids [21] are used to establish the traditional atmospheric profile segmentally in a vertical column atmosphere above the cross-section, and the profile of the observing path tracking method both in the upgoing path and the downgoing path. The FY-3D MWHS-II data are used to conduct a comparative analysis of the simulations, comparing them to the upgoing radiation, downgoing radiation, and observed radiation.…”