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Metadata Report for BODC Series Reference Number 549431

Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
Bissett-Bermann 9040 CTD system  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country United Kingdom
Originator -
Originating Organization Institute of Oceanographic Sciences Bidston Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -

Data Identifiers

Originator's Identifier CH8/78/058
BODC Series Reference 549431

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1978-05-19 18:43
End Time (yyyy-mm-dd hh:mm) 1978-05-19 18:48
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 51.19480 N ( 51° 11.7' N )
Longitude 6.71800 W ( 6° 43.1' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 5.3 m
Maximum Sensor or Sampling Depth 77.8 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
PSALPR011DimensionlessPractical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
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

Salinity noise up to 0.02 PSU.

Data Access Policy

Open Data supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."

Narrative Documents

Bissett-Bermann 9040 Conductivity Temperature and Depth

The basic configuration of the B-B 9040 CTD incorporates pressure, temperature and conductivity sensors which could be logged digitally. This system also made it possible to derive other parameters, such as salinity, depth and sound velocity.

The instrument was versatile and it was possible to attach a dissolved oxygen sensor or to change the CTD housing, allowing it to obtain data from deeper layers in the water column. The accuracy for salinity is ±0.02 ppt , and ±0.02°C for temperature.

This instrument was also known as the Plessey 9040.

RRS Challenger 8/78 CTD Data Documentation


Documentation for the CTD data collected on RRS Challenger Cruise 8/78 (12-24 May 1978) by the Institute of Oceanographic Sciences, Bidston (now POL)

Port of Departure Barry
Port of Return Barry
Area Celtic Sea


Some of the salinity data collected on this cruise are noisy (±0.02 psu)

Data Processing

The raw data were previously manually edited, resequenced and archived in 2 files. 0ne file contained temperature, salinity and depth frequencies and time elapsed and the other contained decca positional infomation.

These data were reprocessed in Febuary 2001.


The following constants (obtained from printouts of the data) were used to convert to real units and calibrate.

Part 1

Temperature Constant 2128.2
Salinity Constant 5001.6
Depth Constant 9718.0

Part 2

Temperature Constant 2127.7
Salinity Constant 5001.4
Depth Constant 9718.0

The downcasts had a temperature correction applied to lessen salinity spiking.

REALT = TC(2) + ((TC(3)-TC(1))/2.0) * TIC


TC(1-3) = Three successive readings of temperature (in °C)
TIC = Timing constant of the instrument = 0.35

Project Information

No Project Information held for the Series

Data Activity or Cruise Information


Cruise Name CH8/78
Departure Date 1978-05-12
Arrival Date 1978-05-24
Principal Scientist(s)Alan J Harrison (Institute of Oceanographic Sciences Bidston Laboratory)
Ship RRS Challenger

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