CTD Profiler

A conductivity-temperature-depth profiler is an instrument lowered into the sea from a ship and used to measure the characteristics of the ocean and collect water samples. Around the outside of the cylindrical frame are a series of bottles which can be triggered closed at various depths to capture a small volume of seawater.

The collected water is then measured on the ship or ashore using very precise machines which can record carbon uptake or nutrients in the sample. In the centre of the frame is the electronic device used to measure conductivity, which is a measure of the saltiness of seawater, and temperature.