Figure D4. Spectrum of kinetic energy at EF at 5 m (blue) and 25 m (brown) and wind stress variance at NDBC 44011 computed using hourly data for the initial 112-day winter period. The wind stress KE has been scaled up so that all spectra are of comparable magnitude. Units are cm/s for current, and N/m² for wind stress. Note the general similarity in the 5- and 25-m records, with the dominant spectral peak at the semidiurnal period.