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 SBE 9
Serial No. 937
Type CTD
SENSOR-Link ↪


No images available.

Contacts

Name Institution Role
Gerd Rohardt Alfred-Wegener-Institute Data Provider
Sandra Tippenhauer Alfred-Wegener-Institute Principal Investigator
Alfred Wegener Institute for Polar and Marine Research Alfred Wegener Institute, Helmholz Centre for Polar and Marine Research Owner


Components

The system consits of the CTD underwater unit (SBE9), the CTD shipboard equipment (SBE11), the watersampler carousel (SBE32) with 24 x 12 liter bottles (OTE) and the data acquisition computer with installed data acquisition software Seasave (V7.23.1) and data processing software SBE Data Processing (V7.22.5) and ManageCTD.
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 Serial Number SENSOR-
Link
Altimeter PSA-916 n/a ↪
SBE35_SN77 Deep Ocean Standards Thermometer SBE35 Deep Ocean Standards Thermometer 0077 ↪
SBE3plus temperature sensor SBE3plus n/a ↪
SBE3plus temperature sensor 5101 ↪
SBE4 conductivity sensor SBE4 n/a ↪
SBE4 conductivity sensor 3238 ↪
SBE43 oxygene sensor 4016 ↪
SBE43 oxygene sensor 4019 ↪
SBE5 pump 4317 ↪
Transmissiometer C-Star n/a ↪
Underwater Vision Profiler SN202 UVP 204 ↪
WET Labs ECO-AFL 1853 ↪


Position

No local frame definition available.

Data logging, storage and archiving

Logged parameters

Parameter Sensor Output Type Unit
altimeter distance m
transmission visibility %
oxygen oxygen ml/l
pressure pressure dbar
fluorescence fluorescence V
conductivity conductivity S/m
temperature water temperature °C

Central geographical ship's position and time standard

Time synchronising of the computers is regulated via Windows Domain affiliation. UTC time is supplied via NMEA telegram and processed by Seasave software.
Geographical position is supplied via NMEA telegram and processed by Seasave software.

Rawdata storage on board 

Mass data: The ManageCTD software produces data files in the mass storage. 



|| root directory | \\polsrv1\data01\CTD ||
|| directory name | CruiseNo \\ e.g. \\ ANT-XXVI-1 ||
|| file name | several files in the following subdirectories: \\ btl \\ conf1 \\ dsp \\ final \\ mat \\ odv \\ work ||
|| Data volume (MB per day) ca | 50 || 
|| Number of files per day ca | 10 ||

Data archiving on land 

After the cruise, the operator transfers the measurement data along with required meta data to AWI after consultaion with the data scientist and AWI Logistics. Then, the data (including meta data) can be made available on https://www.pangaea.de/ (for authorized users only).


|| 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) ||

Documentation