Impact of Kinematic Effects on Simulated Near-Surface Wind Field of Landfall Typhoons

Abstract:

A WRF (weather research and forecasting model) / CALMET (California meteorological model) coupled system was used to simulate the near-surface wind field of super typhoon Meranti in 2016. An improved scheme of kinematic effects of terrain for typhoons (KETT) was proposed. The results show that the systematic error of simulated wind fields near the typhoon center can be successfully eliminated by using the KETT scheme. Compared with the original kenematic effects, the root mean squared errors (RMSEs) of 10-m wind speed and wind direction can be reduced by 10.8% and 5.4%, respectively. Besides, both RMSEs of 10-m wind speed and wind direction with the KETT scheme can be reduced by over 12% than those without the kinematic scheme at Shishe Mountain, indicating that the impact of local terrain on the fine-scale typhoon wind structure near the surface can be better expressed by the KETT scheme.

Key words:typhoon;kinematic effect;wind fields;complex terrain;Meranti