#Standard Name,Definition,Units
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time,Time coordinate of observation based on number of seconds since the defined reference time (for Seacoos this is 'sec since 1970-1-1 00:00:00-00').,second
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latitude,Y-coordinate of dependent observation in geographic coordinate. North is positive.  Alternate definition: The angular distance north and south of the equator with the equator being 0 degrees and the poles 90 degrees.,degrees_north
longitude,X-coordinate of dependent observation in geographic coordinate. East is positive. Alternate definition: The angular distance east and west of the prime meridian (0 degrees longitude) that runs through Greenwich England.,degrees_east
depth,Z-coordinate of dependent observation in vertical distance below reference. Down is positive.,meter
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water_temperature,In situ water temperature,degree_Celsius
sea_surface_temperature,In situ temperature of the ocean near the sea surface.,degree_Celsius
sea_bottom_temperature,In situ temperature of the ocean near the sea floor.,degree_Celsius
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wind_speed,Magnitude of wind velocity.,m s-1
wind_from_direction,Direction from which wind is blowing.  Meteorological Convention.,degrees_true
wind_gust,Maximum instantaneous wind speed (usually no more than but not limited to 10 seconds) within a sample averaging interval.,m s-1
eastward_wind,East/West component of wind vector. Eastward wind is positive.,m s-1
northward_wind,North/South component of wind vector. Northward wind is positive.,m s-1
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significant_wave_height,Average height of the highest one-third of the waves.,meter
dominant_wave_period,Dominant or peak wave period (Tp) is the period corresponding to the frequency band with the maximum value of spectral density in the nondirectional wave spectrum. It is the reciprocal of the peak frequency fp:  Tp = 1/fp  Dominant period is representative of the higher waves encountered during the wave sampling period.  Definition provided by NDBC.,second
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chl_concentration,concentration of chloropyll-a in a defined volume of water,ug L-1
sea_surface_chl_concentration,Concentration of chloropyll-a in a defined volume of water near the sea surface.,ug L-1
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salinity,Measure of salt content of a seawater sample follows UNESCO standards; approximately parts per thousand.,PPT
sea_surface_salinity,Measure of salt content of a seawater sample follows UNESCO standards; approximately parts per thousand near the sea surface.,PPT
sea_bottom_salinity,Measure of salt content of a seawater sample follows UNESCO standards; approximately parts per thousand near the sea floor.,PPT
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air_temperature,In situ temperature of air.,degree_Celsius
air_pressure,Pressure exerted by overlying air.,bar
relative_humidity,Amount of moisture in the air as vapor relative to how much it can possibly hold at the same temperature.,percent
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solar_radiation,sunlight measured in watts per meter squared(watt/meter2),watt/meter2
visibility,Greatest distance an object can be seen and identified. Usually refering to visibility in air but could be other medium.,nautical_mile
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current_speed,Magnitude of velocity of ocean current.,cm s-1
sea_surface_current_speed,Magnitude of velocity of ocean current near the sea surface.,cm s-1
sea_bottom_current_speed,Magnitude of velocity of ocean current near the sea floor.,cm s-1
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current_to_direction,Direction towards which ocean current is going.,degrees_true
sea_surface_current_to_direction,Direction towards which ocean current is going near the sea surface.,degrees_true
sea_bottom_current_to_direction,Direction towards which ocean current is going near the sea floor.,degrees_true
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eastward_current,East/West component of ocean current. Eastward is positive.,cm s-1
sea_surface_eastward_current,East/West component of ocean current near the sea surface. Eastward is positive.,cm s-1
sea_bottom_eastward_current,East/West component of ocean current near the sea floor. Eastward is positive.,cm s-1
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northward_current,North/South component of ocean current. Northward is positive.,cm s-1
sea_surface_northward_current,North/South component of ocean current near the sea surface. Northward is positive.,cm s-1
sea_bottom_northward_current,North/South component of ocean current near the sea floor. Northward is positive.,cm s-1