# Concept

## Sea surface wave mean period from variance spectral density first frequency moment

URI | http://vocab.nerc.ac.uk/standard_name/sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment/ | ||
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Within Vocab | Climate and Forecast Standard Names | ||

Definition | The 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 has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. 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). | ||

Date | None | ||

Note | accepted | ||

modified | 2008-04-15 14:00:00.0 | ||

Broad Match | `P04:G976` |
EARTH SCIENCE > Oceans > Ocean Waves > Wave Period | |

`P64:G976` |
EARTH SCIENCE > Oceans > Ocean Waves > Wave Period | ||

`P02:WVST` |
Wave height and period statistics | ||

Exact Match | http://mmisw.org/ont/cf/parameter/sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment | ||

http://vocab.nerc.ac.uk/standard_name/sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment/ | |||

`P07:CFV8N73` |
sea_surface_wave_mean_period_from_variance_spectral_density_first_frequency_moment | ||

Related | `P06:UTBB` |
Seconds |

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