Recovery of a DF 1000 sidescan sonar towfish.

Sondes measure a number of variables in the water column. This data was recorded by a sonde attached to a submersible. Moving from top to bottom in the readout above, the sonde measured changes in temperature, salinity, dissolved oxygen, depth, pH, turbidity, and chlorophyll concentration over the course of the submersible's dive.

Related Links

Observation Tools: Sonde and CTD

NOAA Ocean Explorer: Technology