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Metadata Report for BODC Series Reference Number 343722

Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
Neil Brown Smart CTD  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country United Kingdom
Originator -
Originating Organization Scottish Marine Biological Association (now Scottish Association for Marine Science)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) NANSEN

Data Identifiers

Originator's Identifier G1/88/005
BODC Series Reference 343722

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1988-11-02 01:26
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 60.30000 N ( 60° 18.0' N )
Longitude 8.58330 W ( 8° 35.0' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 1.29 m
Maximum Sensor or Sampling Depth 590.6 m
Minimum Sensor or Sampling Height 10.4 m
Maximum Sensor or Sampling Height 599.71 m
Sea Floor Depth 601.0 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
PRESPR011DecibarsPressure (spatial coordinate) exerted by the water body by profiling pressure sensor and correction to read zero at sea level
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

No Problem Report Found in the Database

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

Neil Brown Smart Conductivity, Temperature and Depth profiler

The Smart CTD was developed by WHOI, Neil Brown Instrument Systems and MIT and consists of an internally recording CTD which can be programmable to accommodate various sampling schemes. The data retrieval is done via connectors to a computer, where it is digitally logged.

This instrument was designed to be used with minimal technical expertise and to be replaced if problems arise, rather than being repaired at sea.

RV Gorsethorn Cruise 1/88 CTD Data Documentation


Documentation for the CTD data collected on RV Gorsethorn 1/88 (October - November 1988) by the Scottish Marine Biological Association, Oban, Argyll, Scotland, UK, under the direction of D. J. Ellett.


The instrument used was a Neil Brown CTD system. Instrument lowering and raising speeds were between 0.5m/s and 1m/s. An acoustic pinger was placed above the CTD to give an accurate depth measurement, this could then be used to check the CTD pressure calibration. An NIO bottle with reversing thermometers was placed above the pinger, within 2m of the CTD system. A bottle sample was taken at the bottom of the cast providing the temperature and salinity are uniform at that point. If large temperature or salinity gradients were present then the bottle sample was triggered at a suitable site on the upcast. A surface salinity sample was also taken at the start of the dip.

Calibration and Data Quality

The CTD was not calibrated in the laboratory. The manufacturer's calibration was used.

Data Processing

Obvious wild points were edited out of the data and the manufacturer's calibration was applied. Conductivities were converted to conductivity ratios and then converted to salinities using UNESCO recommended routines and sigma-t was calculated. The data values were then sieved to ensure a minimum separation between pressure values of 1 dbar. The data were then visually inspected and major spikes flagged.


Fofonoff, N.P. and Millard Jr., R.C. (1983).
Algorithms for the computation of fundamental properties of sea water. UNESCO Technical Paper on Marine Science 44.

Project Information

North Atlantic Norwegian Sea Exchange (NANSEN)

The North Atlantic Norwegian Sea Exchange (NANSEN) Project was conceived by the ICES Oceanic Hydrography Working Group, and arose from discussions centred around the oceanography of the southeast of Iceland and of the Faroese channels. NANSEN was not a closely coordinated one time survey, but rather provided a framework through which work in these areas could be encouraged.

Several UK cruises were undertaken in support of NANSEN, collecting both moored current meter and CTD data.

Data Activity or Cruise Information


Cruise Name GTH1/88
Departure Date 1988-10-23
Arrival Date 1988-11-06
Principal Scientist(s)David J Ellett (Scottish Marine Biological Association)
Ship MV Gorsethorn

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