Thermosalinograph
The Thermosalinograph or TSG is an 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 TSG data. The data can be used to calculate salinity, density, sound velocity, and other parameters. There are various types of thermosalinographs available on the market today.
Programs collecting TSG data
NOAA fleet
Ship of Opportunity Program (SOOP)
Global Ocean Observing System (GOOS)
Measurement devices
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 tell you the density of the water as well as its sound velocity.
Types
| 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 |
Sources of error
- Water is measured in the engine room which causes biases from heat in the room [2]
References
- ↑ http://www.aoml.noaa.gov/phod/tsg/about.php
- ↑ Saur, J. F. T., 1963: A study of the quality of sea water temperatures reported in logs of ships weather observations. J. Appl. Meteor., 2, 417–425