We thank Dr. John Knaff for providing data for plotting the composited intensity traces for AHs and Atlantic storms, and Dr. Hung-Chi Kuo for providing us the full list of concentric eyewall cases in the WNP from 1997 to 2009. We thank Drs. J. Song and S. Shu for the discussions and improvement of this manuscript and Ms. Lei Wu assistance with the calculation of the environmental conditions. The authors are also appreciated for the constructive and helpful comments from Dr. John Knaff and the other two anonymous reviewers. This research is sponsored by the National Natural Science Foundation of China under Grants 41130964, 41275055, 41275059, and 41105034. The SST data (NOAA_OI_SST_V2) are provided by the NOAA/OAR/ESRL/PSD, Boulder, Colorado.
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