Wave Period Parameters

Mean Period Total Swell

Spectral mean wave period obtained using the reciprocal frequency moment of the total swell spectrum. The total swell spectrum is obtained by only considering the components of the two-dimensional wave spectrum that are not under the influence of the local wind.

mean_period_total_swell:s

Examples

Create a time series showing the mean period of the total swell. The queried location lies in the Philippine Sea south of Nagasaki.https://api.meteomatics.com/2024-04-19T00:00:00ZP3D:PT1H/mean_period_total_swell:s/27.852903,130.116770/html
https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_period_total_swell:s/90,-180_-90,180:1000x600/html

Mean Period Wind Waves

Spectral mean wave period obtained using the reciprocal integral moment of the wind waves spectrum. The wind waves spectrum is obtained by only considering the components of the two-dimensional wave spectrum that are under the influence of the local wind. The integration is performed to infinitely high frequencies.

mean_period_wind_waves:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_period_wind_waves:s/90,-180_-90,180:1000x600/html

Mean Wave Period

Spectral mean wave period obtained using the reciprocal frequency moment of the full wave spectrum. The integration is performed over all theoretical frequencies up to infinity. Again, the frequency wave spectrum is obtained by integrating the two-dimensional wave spectrum over all directions.

mean_wave_period:s

Examples

Show a time series depicting the mean wave period. The queried location lies in the Philippine Sea south of Nagasaki.https://api.meteomatics.com/2024-04-19T00:00:00ZP3D:PT1H/mean_wave_period:s/27.852903,130.116770/html

A part of the corresponding csv-file.https://api.meteomatics.com/2024-04-19T00:00:00ZP3D:PT1H/mean_wave_period:s/27.852903,130.116770/csv

validdate;mean_wave_period:s
2017-08-03T03:00:00Z;10
2017-08-03T04:00:00Z;9.9
2017-08-03T05:00:00Z;9.9
2017-08-03T06:00:00Z;9.9
2017-08-03T07:00:00Z;9.9
2017-08-03T08:00:00Z;10
2017-08-03T09:00:00Z;10.1
2017-08-03T10:00:00Z;10.2
2017-08-03T11:00:00Z;10.3

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period:s/90,-180_-90,180:1000x600/html

Mean Wave Period First Moment

Spectral mean wave period obtained using the first frequency moment of the total swell spectrum. The integration is performed over all theoretical frequencies up to infinity. The frequency wave spectrum is obtained by integrating the two-dimensional wave spectrum over all directions.

mean_wave_period_first_moment:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period_first_moment:s/90,-180_-90,180:1000x600/html

Mean Wave Period First Swell

Spectral mean wave period obtained using the first integral moment of the total swell frequency spectrum. The integration is performed over all theoretical frequencies up to infinity. The total swell frequency spectrum is obtained by integrating the two-dimensional wave spectrum over all directions for all wave components that are no longer under the influence of the local wind (full spectrum without wind sea).

mean_wave_period_first_swell:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period_first_swell:s/90,-180_-90,180:1000x600/html

Mean Wave Period Second Moment

Spectral mean wave period obtained using the second integral moment of the frequency wave spectrum. The integration is performed over all theoretical frequencies up to infinity. The frequency wave spectrum is obtained by integrating the two-dimensional wave spectrum over all directions.

mean_wave_period_second_moment:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period_second_moment:s/90,-180_-90,180:1000x600/html

Mean Wave Period Second Swell

Spectral mean wave period obtained using the second integral moment of the total swell frequency spectrum. The integration is performed over all theoretical frequencies up to infinity. The total swell frequency spectrum is obtained by integrating the two-dimensional wave spectrum over all directions for all wave components that are not under the influence of the local wind (full spectrum without wind sea).

mean_wave_period_second_swell:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period_second_swell:s/90,-180_-90,180:1000x600/html

Mean Wave Period Third Swell

Mean wave period computed using the reciprocal frequency moment of the third most energetic partition of the swell spectrum.
The swell spectrum is obtained by only considering the components of the two-dimensional wave spectrum that are not under the influence of the local wind (full spectrum without wind sea).

mean_wave_period_third_swell:s

Examples

https://api.meteomatics.com/2024-04-19T00:00:00Z/mean_wave_period_third_swell:s/90,-180_-90,180:1000x600/html

Peak Wave Period

The peak wave period is defined as the wave period associated with the most energetic waves in the total wave spectrum at a specific point. Wave regimes that are dominated by wind waves tend to have smaller peak wave periods, and regimes that are dominated by swell tend to have larger peak wave periods. ²

peak_wave_period:s

Examples

MetX chart of the peak wave period and the mean sea level pressure. Current:
https://api.meteomatics.com/2024-04-19Z/peak_wave_period:s/world:0.5,0.5/html_map
Show a time series of the peak wave period. The queried location lies to the south of Nagasaki in the Philippine Sea.https://api.meteomatics.com/2024-04-19T00:00:00ZP3D:PT1H/peak_wave_period:s/27.852903,130.116770/html

https://api.meteomatics.com/2024-04-19T00:00:00ZP3D:PT1H/peak_wave_period:s/27.852903,130.116770/csv

validdate;peak_wave_period:s
2017-08-02T00:00:00Z;12.9
2017-08-02T01:00:00Z;12.9
2017-08-02T02:00:00Z;12.9
2017-08-02T03:00:00Z;13
2017-08-02T04:00:00Z;13
2017-08-02T05:00:00Z;13
2017-08-02T06:00:00Z;13
2017-08-02T07:00:00Z;13
2017-08-02T08:00:00Z;13