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Metadata Report for BODC Series Reference Number 79955

Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
Bissett-Bermann 9006 STD system  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country United Kingdom
Originator -
Originating Organization University of Liverpool Department of Oceanography (now University of Liverpool Department of Earth, Ocean and Ecological Sciences)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -

Data Identifiers

Originator's Identifier 6937
BODC Series Reference 79955

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1969-04-16 09:45
End Time (yyyy-mm-dd hh:mm) 1969-04-16 10:16
Nominal Cycle Interval 3.0 metres

Spatial Co-ordinates

Latitude 18.17000 N ( 18° 10.2' N )
Longitude 16.41670 W ( 16° 25.0' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 0.0 m
Maximum Sensor or Sampling Depth 75.0 m
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
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 -


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

Public domain data

These data have no specific confidentiality restrictions for 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 the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."

Narrative Documents

Bissett-Berman 9060 Salinity Temperature and Depth

The B-B 9060 STD measured salinity, temperature and depth and whose analogue output was in graphical form. The plots created were of salinity and temperature versus depth which had to be manually digitised.

RRS Discovery Cruise 26 STD Data Documentation


Documentation for STD data collected on RRS Discovery Cruise 26 (April - May 1969) by the Department of Oceanography, University of Liverpool, Liverpool, U.K., under the direction of P. Hughes.


The instrument used was the University of Liverpool Bissett Berman Salinity-Temperature-Depth system type 9006.

Sampling and Data Processing

The data output from each STD lowering and raising was automatically recorded in analogue form as plots of salinity and temperature against depth.In the near surface layers spiking due to the differing response times of the temperature and conductivity sensors created a problem in interpreting the salinity profiles. The salinity profiles recorded by the STD system were subject to spiking errors towards low salinity during lowering and towards high salinity during raising. A satisfactory method of eliminating the salinity errors was obtained by superimposing the analogue traces recorded during the lowering and the raising of the STD probe and manually bisecting the resulting envelopes of salinity and temperature. The derived profiles were then digitized at depth intervals of 3m down to a depth of 300m. Below 300m digitisation was on the basis of 2 values every 15m (i.e. 307m, 315m, 322m, 330m, 337m, etc.). Exceptions to this scheme are given below:

RRS Discovery Station No. Digitisation scheme
6896 every 3m to 600m, every 15m thereafter
6898 2m, 5m, 7m, 10m, 12m, 15m, etc.
6905 every 15m to 600m, every 30m thereafter
6908 - 6912, 6962 - 6966 every 1m
6917, 6983, 6984, 6997 every 3m to 300m, every 15m thereafter
6930, 6947, 6958 every 6m to 600m, every 30m thereafter
6967 every 1m to 100m, every 3m from 100m to 300m, then 307m, 315m, 322m 330m 337m, etc.
6969, 6971, 6982, 6998 every 3m to 300m, then 307m, 315m, 322m, 330m, 337m, etc. until 750m, every 15m thereafter
6981 7m, 15m, 22m, 30m, 37m, etc.

The STD casts were usually to a depth of 500m - 750m, but stations 6905, 6917, 6930 and 6947 went to a depth of 1500m - 2000m. A Dahn buoy was laid at station 6970, in 746m of water, and the STD was lowered to 300m every 30 minutes over a period of 2 days whilst the ship maintained its position. Only the first downcast is included in this dataset. A similar exercise was carried out at station 6985, with lowerings to within 5m of the sea bed, but these data have not been included. The absolute accuracies of the temperature and salinity measurements were checked by comparison with a series of temperature measurements and salinity samples obtained with reversing thermometers and Niskin bottles over the course of the cruise.


RRS Discovery Cruise 26, 3 April - 9 May 1969.
Physical and chemical study of the upwelling area off north-west Africa. National Institute of Oceanography Cruise Report No. 26. 6pp.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information


Cruise Name D26_1
Departure Date 1969-04-03
Arrival Date 1969-04-19
Principal Scientist(s)Kenneth F Bowden (University of Liverpool Department of Oceanography)
Ship RRS Discovery

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
Q value below limit of quantification