air_pressure Pressure exerted by overlying air. air_temperature Temperature of air, in situ. bottom_chlorophyll Bottom Water Chlorophyll bottom_water_salinity Bottom Water Salinity chl_concentration concentration of cholorophyll-a in a defined volume of water current_speed Water Current Magnitude current_to_direction Direction toward which current is flowing dominant_wave_period Dominant Wave period drifter_direction direction which drifter is moving in degrees from North drifter_speed drifter speed eastward_current East/West component of water current, Eastward is positive northward_current North/South component of water current, Northward is positive oxygen_concentration concentration of oxygen in a defined volume of water ph (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter precipitation measured precipitation or rainfall precipitation_accumulated_daily measured precipitation or rainfall daily accumulation precipitation_accumulated_storm measured precipitation or rainfall storm accumulation relative_humidity Relative humidity salinity salinity sea_bottom_temperature Bottom Water temperature sea_surface_eastward_current East/West component of ocean current near the sea surface, Eastward is positive sea_surface_northward_current North/South component of ocean current near the sea surface, Northward is positive sea_surface_temperature Surface Water temperature significant_wave_height Significant wave height significant_wave_to_direction Significant Wave Direction solar_radiation measured solar radiation or sunlight surface_chlorophyll Bottom Water Chlorophyll surface_water_salinity Surface Water Salinity turbidity Measure of light scattering due to suspended material in water. visibility Greatest distance an object can be seen and identified. Usually refering to visibility in air water_conductivity Ability of a specific volume (1 cubic centimeter) of water to pass an electrical current water_level water_level water_pressure Water Pressure water_salinity Water Salinity water_temperature Water temperature wind_from_direction Direction from which wind is blowing. Meteorological Convention. wind_gust Maximum instantaneous wind speed (usually no more than but not limited to 10 seconds) within a sample averaging interval wind_speed Wind speed