The authors are grateful to two anonymous reviewers for their helpful comments. This study was supported through the National Basic Research Program of China (2009CB421504), and the National Natural Science Foundation of China under Grants 40775060, 41005033, 40905029, and 40921160381. G. Fu was partly supported by the Chinese Meteorological Agency under Grants GYHY200706031 and GYHY GYHY200906002, and the Chinese Government Program of Introducing Talents of Discipline to Universities (B07036). We also thank the Key Laboratory of Mesoscale Severe Weather (MOE) of Nanjing University for furnishing the Japanese Meteorology Agency Regional Spectral Model 20-km reanalysis.
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Sinclair (2004) deemed that calculations based on the method of Evans and Hart (2003) yielded fluctuating B values for the TCs whose moving directions were varying, and proposed referencing B to the area-averaged thermal wind vector. The method used in Sinclair (2004) produced smoothly varying values of B for the southwest Pacific TCs. We have also employed the method of Sinclair (2004) to calculate the B values of Typhoons Mindulle and Yagi, and found that the B values (not shown) often seemed to be larger than those calculated with the method of Evans and Hart (2003), with the exception of the WRF results for Mindulle. In addition, whether using 10 m as the B threshold is reasonable for western North Pacific TCs, still needs to be considered further if B is calculated as in Sinclair (2004). Therefore, considering the smooth motion of Mindulle and Yagi, we still used the method of Evans and Hart (2003) for the calculation of B in the current study.