Record Label : sea_surface_wind_wave_mean_period_from_variance_spectral_density_first_frequency_moment
Record Title : Sea Surface Wind Wave Mean Period from Variance Spectral Density First Frequency Moment
CF Standard Name : sea_surface_wind_wave_mean_period_from_variance_spectral_density_first_frequency_moment
Record Description : The wind wave directional spectrum can be written as a five dimensional function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), f is frequency and theta is direction. S can be integrated over direction to give S1= integral(S dtheta) . Frequency moments, M(n) of S1 can then be calculated as follows: M(n) = integral(S1 f^n df), where f^n is f to the power of n. The first wave period, T(m1) is calculated as the ratio M(0)/M(1).
Canonical Units : s