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Metadata Report for BODC Series Reference Number 85230

Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
Howaldtswerke-Deutsche Werft Bathysonde CTD profiler  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country Germany
Originator -
Originating Organization Institute of Marine Sciences, Kiel (now GEOMAR Helmholtz Centre for Ocean Research, Kiel (West Shore Campus))
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -

Data Identifiers

Originator's Identifier 3676/ 0
BODC Series Reference 85230

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1975-02-12 17:49
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 2.0 metres

Spatial Co-ordinates

Latitude 21.93430 N ( 21° 56.1' N )
Longitude 17.60800 W ( 17° 36.5' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 4.0 m
Maximum Sensor or Sampling Depth 798.0 m
Minimum Sensor or Sampling Height 482.0 m
Maximum Sensor or Sampling Height 1276.0 m
Sea Floor Depth 1280.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


BODC CODERankUnitsTitle
DEPHPR011MetresDepth (spatial coordinate) relative to water surface in the water body by profiling pressure sensor and conversion to seawater depth using UNESCO algorithm
SSALPR011Parts per thousandSalinity of the water body by conductivity cell
TEMPST011Degrees CelsiusTemperature of the water body by CTD or STD

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database

Data Access Policy

Academic domain data

These data have no specific confidentiality restrictions for academic users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

The recommended acknowledgment is:

"This study uses data from data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."

Narrative Documents

Howaldtswerke-Deutsche Werft Bathysonde CTD profiler

A self-contained conductivity-temperature-pressure profiler developed in the 1970s. The unit could be equipped with a remotely controlled Nansen bottle and thermometer frame to provide water samples and independent temperature measurements. Data were digitised in the underwater unit by means of a set of mechanical relays, thereby limiting the sampling frequency to <2 Hz. Pressure and conductivity were sampled simultaneously, while temperature was subject to a 60 ms delay in order to correct for the sensor time constant.


  Pressure Temperature Conductivity
Range 800 or 6000 dbar unknown 0 to 80 mmho cm-1
Precision ± 0.25% of total range ± 0.01 °C ± 1.5 ‰
Resolution 1 dbar or better 0.01 °C 0.01 mmho cm-1

FS Meteor Cruise 36 STD Data Documentation


Documentation for STD data collected on FS Meteor 36 (January - February 1975) by the Institute fur Meereskunde, Kiel, Federal Republic of Germany.

This was a cruise in conjunction with scientists on board the UK research ship RRS Discovery (Cruise 69). It was organised jointly by the Institute of Oceanographic Sciences and the University of Liverpool, Department of Oceanography in the UK and the Institute fur Meereskunde, Kiel, Germany.


The instrument used was a Bathysonde Salinity-Temperature-Depth system.

Calibration and Data Processing

The calibrations curves for the Bathysonde were determined to be:

  • T(true) = 1.00875 * T(obs) - 0.0534 °C
  • C(true) = 1.00514 * C(obs) - 0.2185 mmho/cm

These were based on a few water bottle casts only, performed for the purpose of calibration. After calibration against the water bottle observations the STD data were despiked, smoothed and interpolated to 2m depth intervals.


Stations were identified by their 4 digit station number.


For the following 3 stations the water depth given was less than the maximum depth of the instrument by more then 10 per cent. The water depths has been set null in the series header, but their values are noted below:

Station Water depth Maximum Instrument Depth
3663 49m 56m
3664 34m 44m
3683 85m 94m


Brockmann, C., Hughes, P. and Tomczak, M. (1977).
Data report on currents, winds and stratification in the North-west African upwelling region during early 1975. Berichte aus dem Institute fur Meereskunde No. 32.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information


Cruise Name MT36
Departure Date 1975-01-14
Arrival Date 1975-03-03
Principal Scientist(s)
Ship FS Meteor

Complete Cruise Metadata Report is available here

Fixed Station Information

No Fixed Station Information held for the Series

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
Blank Unqualified
< Below detection limit
> In excess of quoted value
A Taxonomic flag for affinis (aff.)
B Beginning of CTD Down/Up Cast
C Taxonomic flag for confer (cf.)
D Thermometric depth
E End of CTD Down/Up Cast
G Non-taxonomic biological characteristic uncertainty
H Extrapolated value
I Taxonomic flag for single species (sp.)
K Improbable value - unknown quality control source
L Improbable value - originator's quality control
M Improbable value - BODC quality control
N Null value
O Improbable value - user quality control
P Trace/calm
Q Indeterminate
R Replacement value
S Estimated value
T Interpolated value
U Uncalibrated
W Control value
X Excessive difference

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
0 no quality control
1 good value
2 probably good value
3 probably bad value
4 bad value
5 changed value
6 value below detection
7 value in excess
8 interpolated value
9 missing value
A value phenomenon uncertain
B nominal value
Q value below limit of quantification