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 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 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 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 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 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 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 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 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 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 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 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 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