You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 38 Next »

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. A fluorometer, an oxygen sensor and a transmissiometer are attached to the CTD as well. The system is operational up to 2000m water depth.


ManufacturerSeabird
ModelSBE911plus mit SBE32
Serial No.SBE11P S/N: 11P52063-0792
TypeCTD
SENSOR-Link




Contacts

NameInstitutionRole
Gerd RohardtAlfred Wegener Institute, Helmholtz Centre for Polar and Marine ResearchData Scientist
Sandra TippenhauerAlfred Wegener Institute, Helmholtz Centre for Polar and Marine ResearchEngineer In Charge

Components

The CTD system consists of the underwater unit SBE 9plus, the deck unit SBE 11plus V2 and the carousel water sampler SBE32 which is equipped with free flow water samplers manufactured by Hydro-Bios. The CTD is outfitted with a double set of temperature (SBE 3plus) and conductivity (SBE 4C) sensors that are calibrated regularly. Additionally, an altimeter, a transmissometer, an oxygen sensor and a fluorometer may be attached to the CTD unit and operated to water depths of 6000m.

On the CTD data aquisition PC in the Messraum following software is installed: aquisition software Seasave (Version V7_19), SBE Data processing software, ManageCTD software packet for cleansing and conversion of the data and Ocean Data View (ODV) for visualization.

Under the table in the Messraum a frame with four backup bottles is installed.


NameModelSerial NumberSENSOR-
Link
SBE32 water samplerSBE32n/a
SBE3plus temperature sensor
4918
SBE3plus temperature sensor
5110
SBE4 conductivity sensor
3810
SBE4 conductivity sensor
3827
SBE5 pump
4297
SBE5 pump
5228
Transmissiometer Wetlabs C-Star
435

Position

InfoThe CTD unit is usually stored on the main deck. Electronics and the computer for operation are installed in the Mess- und Registrierraum.

Data logging, storage and archiving

Logged parameters

ParameterSensor Output TypeUnit
conductivityconductivityS/m
water temperaturewater temperature°C
oxygen contentoxygenml/l
pressurepressuredbar
fluorescencefluorescenceV
distance to sea floordistancem
transmissiontransmission%

Central geographical ship's position and time standard

The GPS position of the Trimble GPS receiver antenna is stored in the data files. Time synchronisation is achieved via NTP


Rawdata storage on board

Rawdata are stored on the PC on board by the responsible scientist.


Data archiving on land

After quality checks and consultation with the data scientist CTD data including meta data may be transferred to PANGAEA (https://www.pangaea.de/).


Documentation

  • No labels