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Frontiers | Fine-Scale Structures in the Mid-Level Eyewall of Super Typhoon Rammasun (2014) Simulated With the WRF-LES Framework

It has been numerically demonstrated that the turbulence above the boundary is important to tropical cyclone intensification and rapid intensification, but the three-dimensional structures of the sub-grid-scale (SGS) eddy have not been revealed due to the lack of observational data. In this study, two numerical simulations of Super Typhoon Rammasun (2014) were conducted with the Advanced Weather Research and Forecast (WRF) model by incorporating the large-eddy simulation (LES) technique, in which the enhanced eyewall convection and the process of rapid intensification are captured. Consistent with previous observational studies, the strong turbulent kinetic energy (TKE) is found throughout the whole eyewall inside of the radius of maximum wind in both experiments. The simulations indicate that the strong TKE is associated with horizontal rolls with the horizontal extent of 2-4 km, which are aligned azimuthally in the intense eyewall convection. It is indicated that the three-dimensiona ....

United States , Hainan Island , South China Sea , Brunei General , Typhoon Warning Center , Scientific Research Program Of Shanghai Municipal Science , National Natural Science Foundation Of China , European Planetary Science Congress , Yonsei University , Weather Research , Hurricane Weather Research , European Centre For Weather Forecasting , Technology Commission , China Meteorological Administration , Advanced Weather Research , Typhoon Rammasun , Joint Typhoon Warning Center , Super Typhoon Rammasun , Rapid Radiative Transfer Model , Qizhou Island , European Centre , Medium Range Weather Forecasting , Associated Mid Level Fine , Hurricanes Isabel , National Natural Science Foundation , Scientific Research Program ,