Estimation on the Radius of Maximum Wind Speed using RSMC Best Track Data

摘要

Typhoon simulation method is widely used to estimate sea surface wind speeds during the typhoon periods.Holland (1980) model has been regarded to provide relatively better results for observed wind data.JTWC or RSMC best track data are available for typhoon modeling,but these data show slightly different because the data generation process are different.In this paper,a Newton-Raphson method is used to solve the two nonlinear equations based on the Holland model that is formed by the two typhoon parameters,i.e.the longest radius of 25 m/s and 15 m/s wind speeds,respectively.The solution is the radius of maximum wind speed which is of importance for typhoon modeling.This method is based on the typhoon wind profile of JMA and it shows that Holland model appears to fit better the characteristics of typhoons on the temporal and spatial changes than that of the other models.In case of using RSMC best track data,the method suggested in this study shows better and more reasonable results for the estimation of radius of maximum wind speed because the consistency of the input data is assured.