UNIVERSALITY OF MESO-SCALE SPECTRUM IN SURFACE WIND

Abstract

 The wind spectrum of the atmospheric boundary layer is composed of the two well-known energy peaks. These are, the high frequency peak due to convection in the boundary layer, and the low frequency peak due to baroclinic instability. While the high-frequency peak has been well studied in many previous studies, the low-frequency peak has not been examined as often. This is because long-term data is required to investigate low-frequency phenomena, and data collection is difficult. In this study, the characteristics and formulation of the inertial range that appears from 5 to 24 hours in the wind spectrum were examined. Wind data from meteorological observation towers were used to analyze wind spectrum for up to 17 years. The results show that the interannual variation of the wind speed spectrum is linked to the interannual variation trend of the annual mean wind speed, and that the energy dissipation rate depends on the mean wind speed.