It is found that the RI of Vicente consisted of two Stages: (I) asymmetric Stage (i.e. RI onset), represented by relatively slow intensification associated with a distinct eyewall contraction; (II) axisymmetric Stage with slight eyewall contraction but efficient storm intensification. Results from a system-scale tangential momentum budget indicate that the primary spinup mechanism during Stage I is the radial eddy momentum transport, which is beneficial to accelerate primary circulation within radius of maximum wind (RMW) and eyewall contraction. In contrast，the principal spinup mechanism during Stage II is mainly ascribed to the forced secondary circulation in the response of diabatic heating within eyewall and boundary layer friction, which efficiently advected the absolute angular momentum radially inward and vertically upward to increase the primary circulation around the eyewall region throughout the troposphere. Further budget diagnosis based on scale separation reveals that the interaction between large-scale environmental circulation and vortex-scale vorticity anomalies has dominated the role of primary spinup mechanism during Stage I.
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