Attention:
Please note that operations of the CTD (Conductivity-Temperature-Depth) watersampler requires experienced scientific staff on board. The system is not operated by the ship's crew. Announce operations with the CTD Watersampler to AWI-Logistics prior to the cruise and clarify the data transfer after the cruise.
Summary
The CTD probe measures conductivity and temperature along a vertical transect through the water body. The measured parameter are used to calculate the salinity of the water. Additionally, up to 24 water samples can be taken in different water depths during the CTD measurements.
Manufacturer | Seabird |
---|---|
Model | SBE911plus mit SBE32 |
Serial No. | n/a |
Type | CTD |
Contacts
Name | Institution | Role |
---|---|---|
Gerd Rohardt | Alfred-Wegener-Institute | Data Provider |
Sandra Tippenhauer | Alfred-Wegener-Institute | Editor |
Alfred Wegener Institute for Polar and Marine Research | Alfred Wegener Institute, Helmholz Centre for Polar and Marine Research | Owner |
polarstern dship | Alfred-Wegener-Institute | dship connector |
Components
The CTD underwater unit is equipped with 2 temperature (SBE3plus) and 2 conductivity (SBE4C) sensors by default, which are calibrated on a regular basis. Several external sensors are available, which can be used in water depth up to 6000m: altimeter (Benthos PSA-916D), Fluorometer (Dr. Haardt or Wetlabs EcoFLR), Oxygen sensor (SBE43), Transmissiometer (Weblabs CStar 25cm), mechanical bottom detector.
Subdevices
Name | Model | Type |
---|---|---|
Altimeter | PSA-916 | altimeter |
Lowered Acoustic Doppler Current Profiler | WHM300-I-UG500 | acoustic doppler velocimeter |
SBE32 water sampler | SBE32 | remote water sampler |
SBE3plus temperature sensor | SBE3plus | temperature sensor |
SBE4 conductivity sensor | SBE4 | conductivity meter |
SBE43 oxygene sensor | SBE43 | oxygen sensor |
Transmissiometer | C-Star | transmissometer |
Position
Origin Description: | no xyz-position given, device stored on deck E and deployed when needed |
Data logging, storage and archiving
Logged parameters
Parameter | Sensor Output Type | Unit |
---|---|---|
conductivity | conductivity | S/m |
temperature | water temperature | °C |
altimeter | distance | m |
transmission | visibility | % |
oxygen | oxygen | ml/l |
pressure | pressure | dbar |
fluorescence | fluorescence | V |
Central geographical ship's position and time standard
Geographical position is supplied via NMEA telegram and processed by Seasave software.
Rawdata storage on board
root directory |
\\polsrv1\data01\CTD |
---|---|
directory name |
CruiseNo |
file name |
several files in the following subdirectories: |
Data volume (MB per day) ca |
50 |
Number of files per day ca |
10 |
Data archiving on land
File format(s) |
raw data: *.hex, *.bl, *.hdr, *.xmlcon; processed data: *.txt |
---|---|
Calibration certificates |
YES |
Location of certificates |
PI (calibration data is stored in *.xmlcon file) |