11:45 〜 12:00
[AAS02-05] Spectral analysis on Large Eddy Simulation of Entire Tropical Cyclone
キーワード：Tropical Cyclone, Large Eddy Simulation , Spectral Analysis, Energy Dynamics, Scale Interactions
Tropical cyclone (TC) evolution is driven by complex multiscale interactions. Using high-resolution large-eddy simulations (LES), we capture the full lifecycle of a TC from genesis through intensification, extending slightly beyond peak intensity. This unprecedented simulation results provide detailed insights into small-scale processes and their contributions to the TC’s energy dynamics.
Applying a spectral analysis, we quantify energy exchanges between the mean flow and eddies, as well as interactions among eddy components, to assess their roles in the TC energy budget. Kinetic energy (KE) in the wavenumber (WN) domain reveals distinct characteristics at different developmental stages, with larger eddies (lower WN) exhibiting greater vertical activity but varying radial extents depending on the TC’s stage, while smaller eddies (higher WN) are more significant at the boundaries between the surface and the TC, the TC and the atmosphere, and within the eyewall. To explore spatial variability, we divide the domain into radial regions, uncovering localized energy dynamics that influence intensification.
Our findings emphasize the role of small-scale structures in modulating TC evolution, particularly during the pre-rapid intensification (RI) phase. The high-resolution dataset produced in this study offers a valuable resource for investigating TC intensification mechanisms, providing a more comprehensive understanding of the multiscale processes governing these systems.
Applying a spectral analysis, we quantify energy exchanges between the mean flow and eddies, as well as interactions among eddy components, to assess their roles in the TC energy budget. Kinetic energy (KE) in the wavenumber (WN) domain reveals distinct characteristics at different developmental stages, with larger eddies (lower WN) exhibiting greater vertical activity but varying radial extents depending on the TC’s stage, while smaller eddies (higher WN) are more significant at the boundaries between the surface and the TC, the TC and the atmosphere, and within the eyewall. To explore spatial variability, we divide the domain into radial regions, uncovering localized energy dynamics that influence intensification.
Our findings emphasize the role of small-scale structures in modulating TC evolution, particularly during the pre-rapid intensification (RI) phase. The high-resolution dataset produced in this study offers a valuable resource for investigating TC intensification mechanisms, providing a more comprehensive understanding of the multiscale processes governing these systems.