303 / 2026-03-12 16:17:27

A Horizontal Turbulent Diffusion-Controlled Lower Bound of Tropical Cyclone Radius of Maximum Wind

Tropical Cyclone,Horizontal Turbulent Diffusion,Radius of Maximum Wind

主题1 天气、气候、全球变化、行星大气 > 专题1.26 台风观测、机理与预报

The radius of maximum wind (RMW) of a tropical cyclone (TC) plays a critical role in shaping the wind field and associated hazards. Observations report RMW values as small as 5 km,

yet the existence and magnitude of a physical lower bound remain unclear. Using an axisymmetric boundary-layer diagnostic model, we examine how small the RMW can become before the inner core becomes unstable and undergoes rapid expansion. A nondimensional parameter defined as the horizontal mixing length normalized by the RMW,