Below is an overview of all marine parameters:
Interaction With Ocean Currents
Significant Wave Height  Peak Wave Period  Mean Direction Total Swell  Mean Wave Direction  Max Individual Wave Height 
Mean Direction Wind Waves  Mean Period Total Swell  Mean Period Wind Waves 
Mean Wave Direction First Swell  Mean Wave Direction Second Swell  Mean Wave Direction Third Swell  Mean Wave Period  Mean Wave Period First Moment 
Mean Wave Period First Swell  Mean Wave Period Second Moment  Mean Wave Period Second Swell  Mean Wave Period Third Swell 
Significant Height Total Swell  Significant Height Wind Waves  Significant Wave Height First Swell  Significant Wave Height Second Swell  Significant Wave Height Third Swell 
Ocean Current  Water Temperature  Salinity
Each parameter is explained in more detail below.
General Terms
The twodimensional wave spectrum describes the distribution of the wave energy as a function of frequency and propagation direction. In numerical implementation, the spectrum is discretized using 36 frequencies and 36 directions. The frequency spectrum is obtained by integrating over all directions.
The wave components in the spectrum are divided into wind sea (wind waves) and swell.
 full wave spectrum: wind waves + total swell
 wind sea: wind sea is defined as those wave components that are still growing or being sustained by the wind. In contrast to swell, these waves propagate mainly in the direction of the wind.
 swell: the remaining part of the spectrum is termed swell. Swell consists of a series of mechanical waves that propagate along the interface between water and air (surface gravity waves)
 total swell: if the full remaining part of the spectrum is considered as one entity (full spectrum excluding wind waves).
 first/second/third swell: when the remaining part of the spectrum is split into the 3 most energetic systems (descending in the respective wave heights).
 moments for periods:
 first: reciprocal of mean frequency
 second: reciprocal of the variance of the frequency spectrum
 significant height: the average height of the highest third of the waves
 peak period: defined for the full wave spectrum, reciprocal of the peak frequency (period of the most energetic frequency)
 wave direction: according to meteorological convention  0° means from northern direction
 stokes drift: stokes drift caused by full wave spectrum
Interaction With Ocean Currents
Ocean current models do not consider the stokes drift in the calculation of current speeds and directions. The stokes drift can overshoot the surface ocean current in stormy conditions, but rapidly decreases with depth. In order to get a complete picture of the surface drift however, the ocean current and the stokes drift can be overlaid.
Significant Wave Height
The significant wave height is traditionally defined as the mean wave height (trough to crest) of the highest third of the waves. Nowadays, it is usually defined as four times the standard deviation of the surface elevation or equivalently as four times the square root of the zerothorder moment (area) of the full wave spectrum. ^{1}
significant_wave_height:m
Examples
 MetX chart showing the significant wave height along with the mean sea level pressure.
Current situation:
https://api.meteomatics.com/__replace__0Z/significant_wave_height:m/world:0.5,0.5/html_map  Show a time series of the significant wave height. The queried location lies to the south of Nagasaki in the Philippine Sea.
https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/significant_wave_height:m/27.852903,130.116770/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/__replace__0Z/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/__replace__0T00:00:00ZP3D:PT1H/peak_wave_period:s/27.852903,130.116770/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/peak_wave_period:s/27.852903,130.116770/csv
validdate;peak_wave_period:s 20170802T00:00:00Z;12.9 20170802T01:00:00Z;12.9 20170802T02:00:00Z;12.9 20170802T03:00:00Z;13 20170802T04:00:00Z;13 20170802T05:00:00Z;13 20170802T06:00:00Z;13 20170802T07:00:00Z;13 20170802T08:00:00Z;13
Mean Direction Total Swell
Spectral mean direction in degrees over all frequencies and directions of the total swell spectrum.
The total swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_direction_total_swell:d
Examples
Mean Wave Direction
Spectral mean direction in degrees over all frequencies and directions of the twodimensional wave spectrum.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_wave_direction:d
Examples
 Create a time series of the mean wave direction. The queried location lies to the south of Nagasaki in the Philippine Sea.https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/mean_wave_direction:d/27.852903,130.116770/html
 Create a time series of the mean wave direction. The queried location lies to the south of Nagasaki in the Philippine Sea.https://api.meteomatics.com/__replace__0T00:00:00ZPT12H:PT1H/max_individual_wave_height:m/27.852903,130.116770/json
{"version":"3.0","user":"apitest","dateGenerated":"20180214T16:32:30Z","status":"OK","data": [{"parameter":"max_individual_wave_height:m","coordinates":[{"lat":27.8529,"lon":130.117,"dates": [{"date":"20170802T00:00:00Z","value":4.8},{"date":"20170802T01:00:00Z","value":4.8}, {"date":"20170802T02:00:00Z","value":4.9},{"date":"20170802T03:00:00Z","value":4.9}, {"date":"20170802T04:00:00Z","value":5},{"date":"20170802T05:00:00Z","value":5}, {"date":"20170802T06:00:00Z","value":5},{"date":"20170802T07:00:00Z","value":5.1}, {"date":"20170802T08:00:00Z","value":5.1},{"date":"20170802T09:00:00Z","value":5.2}, {"date":"20170802T10:00:00Z","value":5.2},{"date":"20170802T11:00:00Z","value":5.2}, {"date":"20170802T12:00:00Z","value":5.3}]}]}]}
 https://api.meteomatics.com/__replace__0T00:00:00Z/mean_wave_direction:d/90,180_90,180:1000x600/html
Maximum Individual Wave Height
From a theory of wave height distribution that includes nonlinear effects, the estimation value of the largest single wave height in a record of 20 minutes is derived.
max_individual_wave_height:m
Examples
 Create a time series of the maximal individual wave height. The queried location lies to the south of Nagasaki in the Philippine Sea.https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/max_individual_wave_height:m/27.852903,130.116770/html
 https://api.meteomatics.com/__replace__0T00:00:00Z/max_individual_wave_height:m/90,180_90,180:1000x600/html
Mean Direction Wind Waves
Spectral mean direction over all frequencies and direction of the wind waves spectrum.
The wind waves spectrum is obtained by only considering the components of the twodimensional wave spectrum that are still under the influence of the local wind.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_direction_wind_waves:d
Examples
 https://api.meteomatics.com/__replace__0T00:00:00Z/mean_direction_wind_waves:d/90,180_90,180:1000x600/html
 Obtain the values directly in csv format.https://api.meteomatics.com/__replace__0T00:00:00ZP1D:PT2H/mean_direction_wind_waves:d/27.852903,130.116770/csv
validdate;mean_direction_wind_waves:d 20170825T00:00:00Z;193.3 20170825T02:00:00Z;200.5 20170825T04:00:00Z;202 20170825T06:00:00Z;197.9 20170825T08:00:00Z;183.3 20170825T10:00:00Z;171.9 20170825T12:00:00Z;163.6 20170825T14:00:00Z;170.5 20170825T16:00:00Z;176.2 20170825T18:00:00Z;180.7 20170825T20:00:00Z;183.5 20170825T22:00:00Z;204.1 20170826T00:00:00Z;242.2
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 twodimensional 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/__replace__0T00:00:00ZP3D:PT1H/mean_period_total_swell:s/27.852903,130.116770/html
 https://api.meteomatics.com/__replace__0T00:00:00Z/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 twodimensional 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
Mean Wave Direction First Swell
Spectral mean wave direction computed using the firstmost energetic partition of the swell spectrum The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_wave_direction_first_swell:d
Examples
Mean Wave Direction Second Swell
Spectral mean wave direction computed using the secondmost energetic partition of the swell spectrum The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_wave_direction_second_swell:d
Examples
Mean Wave Direction Third Swell
Spectral mean wave direction computed using the thirdmost energetic partition of the swell spectrum. The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
Please note that we are using the meteorological convention to define directions (Read more here).
mean_wave_direction_third_swell:d
Examples
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 twodimensional 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/__replace__0T00:00:00ZP3D:PT1H/mean_wave_period:s/27.852903,130.116770/html
 A part of the corresponding csvfile.https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/mean_wave_period:s/27.852903,130.116770/csv
validdate;mean_wave_period:s 20170803T03:00:00Z;10 20170803T04:00:00Z;9.9 20170803T05:00:00Z;9.9 20170803T06:00:00Z;9.9 20170803T07:00:00Z;9.9 20170803T08:00:00Z;10 20170803T09:00:00Z;10.1 20170803T10:00:00Z;10.2 20170803T11:00:00Z;10.3
 https://api.meteomatics.com/__replace__0T00:00:00Z/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 twodimensional wave spectrum over all directions.
mean_wave_period_first_moment:s
Examples
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 twodimensional 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
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 twodimensional wave spectrum over all directions.
mean_wave_period_second_moment:s
Examples
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 twodimensional 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
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 twodimensional wave spectrum that are not under the influence of the local wind (full spectrum without wind sea).
mean_wave_period_third_swell:s
Examples
Significant Height Total Swell
4 times the square root of the integral over all directions and all frequencies of the total swell spectrum. The total swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
significant_height_total_swell:m
Examples
Significant Height Wind Waves
4 times the square root of the integral over all directions and all frequencies of the windsea wave spectrum. The wind waves spectrum is obtained by only considering the components of the twodimensional wave spectrum that are under the influence of the local wind (wind sea).
significant_height_wind_waves:m
Examples
Significant Wave Height First Swell
Significant wave height for the first most energetic partition of the swell spectrum, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies of the first partition of the swell spectrum. The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
significant_wave_height_first_swell:m
Examples
 https://api.meteomatics.com/__replace__0T00:00:00Z/significant_wave_height_first_swell:m/90,180_90,180:1000x600/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/significant_wave_height_first_swell:m/27.852903,130.116770/html
Significant Wave Height Second Swell
Significant wave height for the second most energetic partition of the swell spectrum, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies of the second partition of the swell spectrum. The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
significant_wave_height_second_swell:m
Examples
 https://api.meteomatics.com/__replace__0T00:00:00Z/significant_wave_height_second_swell:m/90,180_90,180:1000x600/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/significant_wave_height_second_swell:m/27.852903,130.116770/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/significant_wave_height_second_swell:m/27.852903,130.116770/csv
validdate;significant_wave_height_second_swell:m 20180301T07:00:00Z;0.7 20180301T08:00:00Z;0.9 20180301T09:00:00Z;1.1 20180301T10:00:00Z;1.3 20180301T11:00:00Z;1.5 20180301T12:00:00Z;1.7 20180301T13:00:00Z;1.6 20180301T14:00:00Z;1.5 20180301T15:00:00Z;1.4 20180301T16:00:00Z;1.3
Significant Wave Height Third Swell
Significant wave height for the third most energetic partition of the swell spectrum, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies of the third partition of the swell spectrum. The swell spectrum is obtained by only considering the components of the twodimensional wave spectrum that are not under the influence of the local wind.
significant_wave_height_third_swell:m
Examples
 https://api.meteomatics.com/__replace__0T00:00:00Z/significant_wave_height_third_swell:m/90,180_90,180:1000x600/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/significant_wave_height_third_swell:m/27.852903,130.116770/html
Stokes Drift
For a pure wave motion in fluid dynamics, the Stokes drift velocity is the average velocity of a specific fluid parcel as it travels with the fluid flow. For instance, a particle floating at the free surface of water waves experiences a net Stokes drift velocity in the direction of wave propagation. Along with effects such as Ekman drift and geostrophic currents, the Stokes drift is one of the most relevant processes in the transport of marine debris.
Please note that we are using the meteorological convention to define directions (Read more here).
Speed and direction:
stokes_drift_speed:<speed_unit>
stokes_drift_dir:d
Components (u is positive for a west to east flow, v is positive for a south to north flow ):
stokes_drift_speed_u:<speed_unit>
stokes_drift_speed_v:<speed_unit>
Available speed units: ms, kmh, kn
Examples
 https://api.meteomatics.com/__replace__0T00:00:00Z/stokes_drift_speed_u:ms/90,180_90,180:1000x600/html
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/stokes_drift_speed_u:ms/27.852903,130.116770/html
 https://api.meteomatics.com/__replace__0T00:00:00Z/stokes_drift_speed_v:ms/90,180_90,180:1000x600/html (upper right)
 https://api.meteomatics.com/__replace__0T00:00:00ZP3D:PT1H/stokes_drift_speed_v:ms/27.852903,130.116770/html (lower right)
Ocean Current
These parameters describe the velocity of the ocean currents.
Please note that we are using the meteorological convention to define directions (Read more here).
Speed and direction (surface level):
ocean_current_speed:<speed_unit>
ocean_current_direction:d
Components (surface level, u is positive for a west to east flow, v is positive for a south to north flow):
ocean_current_u:<speed_unit>
ocean_current_v:<speed_unit>
Speed and direction (submarine levels):
ocean_current_speed_<level>:<speed_unit>
ocean_current_direction_<level>:d
Components (submarine levels, u is positive for a west to east flow, v is positive for a south to north flow):
ocean_current_u_<level>:<speed_unit>
ocean_current_v_<level>:<speed_unit>
Available levels: 2m, 4m, 6m, 8m, 10m, 12m, 15m, 20m, 50m, 100m 1000m
(below mean sea level)
Available speed units: ms, kmh, kn
 Global water current speed in a depth of 2 m: Current situation: https://api.meteomatics.com/__replace__0T00:00:00Z/ocean_current_speed_2m:ms/80,180_80,180:1000x600/html_map
Water Temperature
Gives the temperature of the sea surface.
t_sea_sfc:<unit>
Available units: C, K, F
 Global sea surface temperatures: Current situation: https://api.meteomatics.com/__replace__0T00:00:00Z/t_sea_sfc:C/80,180_80,180:1000x600/html_map

Time series for sea temperature at a single coordinate:
validdate;t_sea_sfc:C 20210125T00:00:00Z;21.7 20210125T01:00:00Z;21.7 20210125T02:00:00Z;21.7 20210125T03:00:00Z;21.7 20210125T04:00:00Z;21.7 20210125T05:00:00Z;21.7 20210125T06:00:00Z;21.7 20210125T07:00:00Z;21.7 20210125T08:00:00Z;21.7 20210125T09:00:00Z;21.7 20210125T10:00:00Z;21.7 20210125T11:00:00Z;21.7 20210125T12:00:00Z;21.7 20210125T13:00:00Z;21.8 20210125T14:00:00Z;21.8
Current situation: https://api.meteomatics.com/__replace__0T00:00:00Z__replace__3T00:00:00Z:PT1H/t_sea_sfc:C/29.6,38.6/csv
Salinity
The amount of salt within the water.
Surface salinity:
salinity:psu
Example
 Wikipedia Page of Significant Wave Height: http://en.wikipedia.org/wiki/Significant_wave_height
 National Hurricane Center: http://www.nhc.noaa.gov/pdf/TAFB_wave_period.pdf