Impact of nested high-resolution grids on simulation landfall typhoons at the southeast coast of China
The nested high-resolution grids play a crucial role in typhoon simulations.Based on the COAWST(coupled ocean-atmosphere-wave-sediment transport)model,two sets of simulation scenarios were designed for 11 typhoons that landed in Guangdong and Hainan.One set was used nesting a 3 km resolution grid within a 9 km resolution grid,while the other set employed a single-layer 9 km resolution grid.The simulation results were then compared with the best-track data released by the Tropical Cyclone Data Center of the China Meteorological Administration to investigate whether the nested high-resolution grid can improve the accuracy of typhoon simulations.From the perspective of typhoon tracks,nesting a 3 km resolution grid within a 9 km resolution grid resulted in smaller errors in typhoon track simulations and had a lesser impact on the simulation of the subtropical high pressure.In contrast,the typhoon track errors simulated by the single-layer 9 km resolution grid were larger.Therefore,by comparing the typhoon tracks and intensities simulated by the two sets of scenarios,the simulation accuracy was further improved when using the nested high-resolution grid scheme in the simulation area.The wind fields and subtropical high pressures simulated by the two schemes were quite similar.For the single-layer grid,the typhoon tracks and intensity errors simulated by the nested high-resolution grid scheme were smaller,with a smaller typhoon eye and stronger typhoon intensity and potential vorticity.
high resolution meshtyphoon simulationCOAWST modeltyphoon tracktyphoon intensitytyphoon structure
NETL
NSTL
万方数据
维普
