CTD
CTD stands for Conductivity, Temperature, Depth. These three parameters are among the most fundamental sets of observations in ocean science because they are used to calculate salinity and density of the water, and identify bodies of water from known oceans or areas. Measuring temperature and conductivity allows calculation of salinity, and then from salinity and temperature it is possible to calculate density.
OceanLab has several CTD instruments (click here for equipment overview). They are installed on the profiling frame at the Munkholmen site, and at Ingdalen there is a CTD in the inside of the buoy (ca. 1m depth) and several attached at different depths on the mooring line (at 10m, 25m, 50m, 100m, 250m and 500m depths). The instruments on the mooring line at Ingdalen are battery powered, and communicate their data to the surface through the mooring line using an inductive modem.
Instrument locations and types
| Site | Placement | Instrument | Aux. parameters | Data |
|---|---|---|---|---|
| Munkholmen | Profiling frame (from 0.5m to 80m depths) | SeaCAT Plus V2 profiler pumped conductivity, temperature depth recorder | pH, Oxygen, Chlorophyll, Turbidity CDOM PAR | Coming soon |
| Ingdalen | Inside moonpool (surface ca. 1m depth) | HydroCAT-EP V2 conductivity, temperature pH recorder | pH, Oxygen, Chlorophyll, Turbidity CDOM | Environmental Data: Ingdalen |
| Ingdalen | Mooring cable at depths: 10m, 25m, 50m, 100m, 250m, 500m | SBE 37-IMP MicroCAT | Oxygen | Environmental Data: Ingdalen |
| SINTEF SeaLab | Mobile profiling frame (for boatwork) | SeaCAT Plus V2 profiler pumped conductivity, temperature depth recorder | pH, Oxygen, Chlorophyll, Turbidity CDOM PAR | n/a |
surface water temperature
Images
Munkholmen profiling frame.
2022-03-18
Ingdalen CTD mount before deployment.
2022-05-25
Ingdalen inductive modem connection before deployment.
2022-05-25
Ingdalen MicroCAT CTD on the mooring cable before deployment.
2021-09-07
External links
CTD (instrument)Thermocline
Halocline
Pycnocline
Water mass
The oceanic mixed layer
NOAA Ocean Facts