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Home > Data Products > Data Product Descriptions |  |
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| Product Descriptions |
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| Conductivity The conductivity (Siemens/meter: S/m) sensor is accurate to +/- 0.005 S/m range from 0-9 S/m. Temperature Temperature (degrees Centigrade: °C) is used here to denote the in situ sea water temperature determined using the ITS-90 algorithm. The sensor has an accuracy of +/- 0.005 °C and values range from -5 to 35 °C. Pressure Pressure (decibars: db; a pressure change of 1 decibar equals about 1 meter of seawater) is measured by a strain gauge sensor with an accuracy of +/- 0.02 m. The mounted pressure sensor records the distance between the sensor and the surface of the water in decibars. The sensors are mounted near-surface. Transmittance Transmittance (percentage: %) is the percent of light which is not attenuated within a given pathlength. Transmittance is calculated from the voltage readings from the transmissometer. |
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Salinity Salinity (dimensionless) is calculated from the conductivity measurement using the UNESCO (1981) algorithm. Salinity quantifies the total amount of dissolved solids in seawater. A salinity of 33 means that each kilogram of seawater contains 33 grams of total dissolved solids, mostly sodium chloride. Sigma-t Sigma-t (dimensionless), defined as st=(r(s,t,o) - 1000), where r is in (kg m-3), includes the effect of salinity and temperature on density without the effect of pressure. This allows for a better estimate of density differences when two dissimilar water masses are at the same level. Fluorescence: Fluorescence (volts: V).Values range between 0-5 volts and the accuracy varies with the type of sensor. Chlorophyll Chlorophyll (milligrams per cubic meter: mg m-3) is an estimate of the concentration of in situ chlorophyll from in vivo fluorescence. |
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