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The Thermosalinograph or TSG is an measuring instrument mounted near the water intake of ships to continuously measure sea surface temperature and conductivity while the ship is in motion.[1] Various programs have been developed to assist in the collection and analysis of data from a TSG. The data can be used to calculate salinity, density, sound velocity within the water, and other parameters. There are various types of thermosalinographs available on the market today.
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NOAA fleet
Ship of Opportunity Program (SOOP)
Global Ocean Observing System (GOOS)
GOSUD Global Ocean Surface Underway Data (http://www.gosud.org)
The thermosalinograph uses a conductivity cell to measure conductivity, which can then be translated into a value of salinity. Also a thermistor cell measures the temperature of the surface water, which when combined with the conductivity can be used calculate the density of the water and the sound velocity within it.
| Model | Applications |
|---|---|
| SBE 21 SeaCAT Thermosalinograph | real-time sea surface temperature and conductivity |
| SBE 45 MicroTSG (Thermosalinograph) | shipboard determination of sea surface (pumped-water) conductivity, temperature, salinity, and sound velocity |
Water is measured in the engine room, which can cause biases from heat in the room.[2]
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