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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.

ManufacturerSeabird
ModelSBE911plus mit SBE32
Serial No.n/a
TypeCTD



Contacts

NameInstitutionRole
Gerd RohardtAlfred-Wegener-InstituteData Provider

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

NameModelType
AltimeterPSA-916altimeter
Lowered Acoustic Doppler Current ProfilerWHM300-I-UG500acoustic doppler velocimeter
SBE32 water samplerSBE32remote water sampler
SBE3plus temperature sensorSBE3plustemperature sensor
SBE4 conductivity sensorSBE4conductivity meter
SBE43 oxygene sensorSBE43oxygen sensor
TransmissiometerC-Startransmissometer

Position

Origin Description:no xyz-position given, device stored on deck E and deployed when needed

Data logging, storage and archiving

Logged parameters

ParameterSensor Output TypeUnit
conductivityconductivityS/m
temperaturewater temperature°C
altimeterdistancem
transmissionvisibility%
oxygenoxygenml/l
pressurepressuredbar
fluorescencefluorescenceV

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





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