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Scale (km). 1800. 180. 18. 1.8. 0.18. 0.018. Van de Hoven. 100 m. Operational model Grid-size. Can current boundary layer turbulence parameterization schemes realistically represent the turbulent transport in high hurricane wind conditions? How can we predict the HBL organized

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1800

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  1. Scale (km) 1800 180 18 1.8 0.18 0.018 Van de Hoven 100 m Operational model Grid-size • Can current boundary layer turbulence parameterization schemes realistically represent the turbulent transport in high hurricane wind conditions? • How can we predict the HBL organized structures and the associated damaging winds for hurricane wind damage Mitigation? clouds turbulence Parameterization Large eddy simulation

  2. Classic Large eddy simulation (LES) • Simulation domain cannot be very large, typically about tens of kilometers. • Initialized with idealized vertical profiles and forced with uniform surface conditions and horizontal homogeneous large-scale atmospheric forcings. • Hurricane vortex is a moving target. • Swirling hurricane wind changes the speed and direction continuously. Classic LES cannot be used to study HBL

  3. WRF large-eddy simulation (WRF-LES) Hurricane Ivan Portable Wind Tower (PWT)

  4. The problem can be solved by increasing model resolution so that small scale processes, such as large turbulent eddies and clouds, are explicitly resolved. • LES can be executed in a weather forecasting mode by nesting an LES domain in mesoscale models (Zhu 2007). • Such multi-scale simulations open the door to simulate background flow, hurricane vortex, and down to turbulent eddies in a unified system. PROPOSAL : Developmen of a multi-scale modeling system from Weather Forecast & Research (WRF) model including an online LES domain to explicitly simulate large turbulent eddies in a weather forecasting mode.

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