Metadata Report for BODC Series Reference Number 384322


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Sea-Bird SBE 911 CTD  CTD; water temperature sensor; salinity sensor
Sea-Bird SBE 13 Dissolved Oxygen Sensor  dissolved gas sensors
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Mr Anton Edwards
Originating Organization Dunstaffnage Marine Laboratory (now Scottish Association for Marine Science)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier CH86/91/014
BODC Series Reference 384322
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1991-11-29 00:19
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars
 

Spatial Co-ordinates

Latitude 55.63170 N ( 55° 37.9' N )
Longitude 5.94670 W ( 5° 56.8' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 2.97 m
Maximum Sensor or Sampling Depth 102.04 m
Minimum Sensor or Sampling Height 7.95 m
Maximum Sensor or Sampling Height 107.03 m
Sea Floor Depth 110.0 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
 

Parameters

BODC CODERankUnitsTitle
DOXYPR011Micromoles per litreConcentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ Beckmann probe
PRESPR011DecibarsPressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected 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

The oxygen data collected on this cruise have not been calibrated against sample data and should be used with great caution.


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

Sea Bird Electronics SBE13 Dissolved Oxygen Sensor

The SBE 13 was designed as an auxiliary sensor for Sea Bird SBE 9plus, but can fitted in custom instrumentation applications. When used with the SBE 9 Underwater Unit, a flow-through plenum improves the data quality, as the pumping water over the sensor membrane reduces the errors caused by oxygen depletion during the periods of slow or intermittent flushing and also reduces exposure to biofouling.

The output voltage is proportional to membrane current (oxygen current) and to the sensor element's membrane temperature (oxygen temperature), which is used for internal temperature compensation.

Two versions of the SBE 13 are available: the SBE 13Y uses a YSI polarographic element with replaceable membranes to provide in situ measurements up to 2000 m depth and the SBE 13B uses a Beckman polarographic element to provide in situ measurements up to 10500 m depth, depending on the sensor casing. This sensor includes a replaceable sealed electrolyte membrane cartridge.

The SBE 13 instrument has been out of production since 2001 and has been superseded by the SBE 43.

Specifications

Measurement range 0 to 15 mL L-1
Accuracy 0.1 mL L-1
Time response

2 s at 25°C

5 s at 0°C

Depth range

2000 m (SBE 13Y- housing in anodized aluminum)

6800 m (SBE 13B- housing in anodized aluminum)

105000 m (SBE 13B- housing in titanium)

Further details can be found in the manufacturer's specification sheet.

Sea-Bird Electronics SBE 911 and SBE 917 series CTD profilers

The SBE 911 and SBE 917 series of conductivity-temperature-depth (CTD) units are used to collect hydrographic profiles, including temperature, conductivity and pressure as standard. Each profiler consists of an underwater unit and deck unit or SEARAM. Auxiliary sensors, such as fluorometers, dissolved oxygen sensors and transmissometers, and carousel water samplers are commonly added to the underwater unit.

Underwater unit

The CTD underwater unit (SBE 9 or SBE 9 plus) comprises a protective cage (usually with a carousel water sampler), including a main pressure housing containing power supplies, acquisition electronics, telemetry circuitry, and a suite of modular sensors. The original SBE 9 incorporated Sea-Bird's standard modular SBE 3 temperature sensor and SBE 4 conductivity sensor, and a Paroscientific Digiquartz pressure sensor. The conductivity cell was connected to a pump-fed plastic tubing circuit that could include auxiliary sensors. Each SBE 9 unit was custom built to individual specification. The SBE 9 was replaced in 1997 by an off-the-shelf version, termed the SBE 9 plus, that incorporated the SBE 3 plus (or SBE 3P) temperature sensor, SBE 4C conductivity sensor and a Paroscientific Digiquartz pressure sensor. Sensors could be connected to a pump-fed plastic tubing circuit or stand-alone.

Temperature, conductivity and pressure sensors

The conductivity, temperature, and pressure sensors supplied with Sea-Bird CTD systems have outputs in the form of variable frequencies, which are measured using high-speed parallel counters. The resulting count totals are converted to numeric representations of the original frequencies, which bear a direct relationship to temperature, conductivity or pressure. Sampling frequencies for these sensors are typically set at 24 Hz.

The temperature sensing element is a glass-coated thermistor bead, pressure-protected inside a stainless steel tube, while the conductivity sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Thermistor resistance or conductivity cell resistance, respectively, is the controlling element in an optimized Wien Bridge oscillator circuit, which produces a frequency output that can be converted to a temperature or conductivity reading. These sensors are available with depth ratings of 6800 m (aluminium housing) or 10500 m (titanium housing). The Paroscientific Digiquartz pressure sensor comprises a quartz crystal resonator that responds to pressure-induced stress, and temperature is measured for thermal compensation of the calculated pressure.

Additional sensors

Optional sensors for dissolved oxygen, pH, light transmission, fluorescence and others do not require the very high levels of resolution needed in the primary CTD channels, nor do these sensors generally offer variable frequency outputs. Accordingly, signals from the auxiliary sensors are acquired using a conventional voltage-input multiplexed A/D converter (optional). Some Sea-Bird CTDs use a strain gauge pressure sensor (Senso-Metrics) in which case their pressure output data is in the same form as that from the auxiliary sensors as described above.

Deck unit or SEARAM

Each underwater unit is connected to a power supply and data logging system: the SBE 11 (or SBE 11 plus) deck unit allows real-time interfacing between the deck and the underwater unit via a conductive wire, while the submersible SBE 17 (or SBE 17 plus) SEARAM plugs directly into the underwater unit and data are downloaded on recovery of the CTD. The combination of SBE 9 and SBE 17 or SBE 11 are termed SBE 917 or SBE 911, respectively, while the combinations of SBE 9 plus and SBE 17 plus or SBE 11 plus are termed SBE 917 plus or SBE 911 plus.

Specifications

Specifications for the SBE 9 plus underwater unit are listed below:

Parameter Range Initial accuracy Resolution at 24 Hz Response time
Temperature -5 to 35°C 0.001°C 0.0002°C 0.065 sec
Conductivity 0 to 7 S m-1 0.0003 S m-1 0.00004 S m-1 0.065 sec (pumped)
Pressure 0 to full scale (1400, 2000, 4200, 6800 or 10500 m) 0.015% of full scale 0.001% of full scale 0.015 sec

Further details can be found in the manufacturer's specification sheet.

RRS Challenger Cruise 86/91 CTD Data Documentation

Introduction

Documentation for the CTD data collected on RRS Challenger 86/91 (November - December 1991) by the Dunstaffnage Marine Laboratory, Oban, Argyll, Scotland, UK, under the direction of D. J. Ellett.

Instrumentation and Processing

The instrument used was a Seabird 9/11 CTD, and the data were processed using the Seabird software. The manufacturer's calibrations were used. Data have been averaged to 1 decibar values.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name CH86B
Departure Date 1991-11-23
Arrival Date 1991-12-02
Principal Scientist(s)Anton Edwards (Dunstaffnage Marine Laboratory)
Ship RRS Challenger

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameDML Line B
CategoryOffshore route/traverse

DML Line B

Line B is a survey section between Islay and Kintyre on the west coast of Scotland. The line comprises five fixed CTD stations, which were established as part of routine monitoring work on the Scottish continental shelf by Dunstaffnage Marine Laboratory (DML). The line was occupied during the 1980s.

Map of standard DML Line B CTD Stations

BODC image

Map produced using the GEBCO Digital Atlas.

The white triangles indicate the nominal positions of each standard station on Line B.

Nominal station details

DML Line B: Glenacardoch Point (Kintyre, Scotland) - Ardmore Island (Islay, Scotland)

Station Nominal latitude Nominal longitude Approx.
depth (m)
Comment
1B 55° 35.0' N 05° 45.0' W 20 Glenacardoch Point
2B 55° 36.0' N 05° 49.0' W 50  
3B 55° 37.0' N 05° 53.0' W 105  
4B 55° 38.0' N 05° 57.0' W 110  
5B 55° 39.0' N 06° 01.0' W 20 Ardmore Island

In addition to Line B, there are other DML repeated survey transects which converge at Islay. These are Line C, Line D, and Line P.

Related Fixed Station activities are detailed in Appendix 1

Fixed Station Information

Station NameDML Line B Station 4B
CategoryOffshore location
Latitude55° 38.00' N
Longitude5° 57.00' W
Water depth below MSL110.0 m

DML Station 4B

Station 4B is one of five fixed CTD stations between Islay and Kintyre on the west coast of Scotland, established by scientists at Dunstaffnage Marine Laboratory (DML).

Related Fixed Station activities are detailed in Appendix 2


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

Appendix 1: DML Line B

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Series IdentifierData CategoryStart date/timeStart positionCruise
193231CTD or STD cast1983-05-22 16:17:0055.6 N, 5.7516 WRRS Challenger CH7A/83
193243CTD or STD cast1983-05-22 16:42:0055.6 N, 5.8166 WRRS Challenger CH7A/83
193255CTD or STD cast1983-05-22 17:10:0055.6183 N, 5.8866 WRRS Challenger CH7A/83
193267CTD or STD cast1983-05-22 17:52:0055.6333 N, 5.95 WRRS Challenger CH7A/83
193279CTD or STD cast1983-05-22 18:22:0055.65 N, 6.015 WRRS Challenger CH7A/83
96485CTD or STD cast1983-08-11 06:56:0055.6416 N, 6.015 WRRS Challenger CH11/83
96497CTD or STD cast1983-08-11 07:59:0055.6416 N, 5.95 WRRS Challenger CH11/83
193833CTD or STD cast1983-08-11 08:19:0055.6166 N, 5.8833 WRRS Challenger CH11/83
96504CTD or STD cast1983-08-11 09:55:0055.6066 N, 5.815 WRRS Challenger CH11/83
96516CTD or STD cast1983-08-11 16:31:0055.58 N, 5.7483 WRRS Challenger CH11/83
97648CTD or STD cast1984-06-25 06:01:0055.5833 N, 5.75 WRRS Challenger CH2/84
97661CTD or STD cast1984-06-25 06:45:0055.6083 N, 5.8833 WRRS Challenger CH2/84
97673CTD or STD cast1984-06-25 07:39:0055.6166 N, 5.8833 WRRS Challenger CH2/84
97685CTD or STD cast1984-06-25 08:51:0055.6416 N, 5.95 WRRS Challenger CH2/84
97697CTD or STD cast1984-06-25 09:31:0055.65 N, 6.0166 WRRS Challenger CH2/84
258001CTD or STD cast1984-12-04 10:38:0055.6416 N, 5.9483 WRRS Challenger CH10/84
258013CTD or STD cast1984-12-04 11:22:0055.6166 N, 5.8833 WRRS Challenger CH10/84
258025CTD or STD cast1984-12-04 12:00:0055.6083 N, 5.815 WRRS Challenger CH10/84
258037CTD or STD cast1984-12-04 12:49:0055.5833 N, 5.75 WRRS Challenger CH10/84
258781CTD or STD cast1985-01-30 07:56:0055.65 N, 6.0166 WRRS Challenger CH1/85
258793CTD or STD cast1985-01-30 08:28:0055.6416 N, 5.9483 WRRS Challenger CH1/85
258800CTD or STD cast1985-01-30 09:04:0055.6166 N, 5.885 WRRS Challenger CH1/85
258812CTD or STD cast1985-01-30 09:40:0055.6083 N, 5.8166 WRRS Challenger CH1/85
258824CTD or STD cast1985-01-30 13:30:0055.5833 N, 5.75 WRRS Challenger CH1/85
253008CTD or STD cast1985-05-03 03:50:0055.5833 N, 5.75 WRRS Challenger CH4/85
253021CTD or STD cast1985-05-03 04:27:0055.6066 N, 5.8166 WRRS Challenger CH4/85
253033CTD or STD cast1985-05-03 05:03:0055.6166 N, 5.8833 WRRS Challenger CH4/85
253045CTD or STD cast1985-05-03 05:50:0055.6416 N, 5.95 WRRS Challenger CH4/85
253057CTD or STD cast1985-05-03 06:26:0055.6533 N, 6.0166 WRRS Challenger CH4/85
254859CTD or STD cast1985-05-14 21:45:0055.6166 N, 5.8816 WRRS Challenger CH4/85
260773CTD or STD cast1985-08-17 07:33:0055.5833 N, 5.7516 WRRS Challenger CH8/85
260785CTD or STD cast1985-08-17 08:11:0055.6066 N, 5.8183 WRRS Challenger CH8/85
260797CTD or STD cast1985-08-17 08:44:0055.6166 N, 5.8866 WRRS Challenger CH8/85
260804CTD or STD cast1985-08-17 09:33:0055.6416 N, 5.9516 WRRS Challenger CH8/85
260816CTD or STD cast1985-08-17 10:15:0055.6483 N, 6.0166 WRRS Challenger CH8/85
255421CTD or STD cast1985-12-10 21:37:0055.5866 N, 5.7583 WRRS Frederick Russell FR13/85
255433CTD or STD cast1985-12-10 22:14:0055.5916 N, 5.8083 WRRS Frederick Russell FR13/85
255445CTD or STD cast1985-12-10 22:53:0055.6166 N, 5.8866 WRRS Frederick Russell FR13/85
255457CTD or STD cast1985-12-10 23:50:0055.6416 N, 5.9566 WRRS Frederick Russell FR13/85
255469CTD or STD cast1985-12-11 00:27:0055.6516 N, 6.0166 WRRS Frederick Russell FR13/85
251192CTD or STD cast1987-05-05 11:12:0055.6516 N, 6.015 WRRS Challenger CH14
251211CTD or STD cast1987-05-05 11:45:0055.6416 N, 5.95 WRRS Challenger CH14
251223CTD or STD cast1987-05-05 12:28:0055.6166 N, 5.8833 WRRS Challenger CH14
251235CTD or STD cast1987-05-05 13:08:0055.61 N, 5.815 WRRS Challenger CH14
251247CTD or STD cast1987-05-05 13:42:0055.585 N, 5.7483 WRRS Challenger CH14
266418CTD or STD cast1989-05-09 20:50:0055.65 N, 6.0166 WRV Lough Foyle LF1/89
266431CTD or STD cast1989-05-09 21:19:0055.6333 N, 5.95 WRV Lough Foyle LF1/89
266443CTD or STD cast1989-05-09 21:45:0055.6166 N, 5.8833 WRV Lough Foyle LF1/89
266455CTD or STD cast1989-05-09 22:11:0055.6 N, 5.8166 WRV Lough Foyle LF1/89
266467CTD or STD cast1989-05-09 22:40:0055.5833 N, 5.75 WRV Lough Foyle LF1/89
318325CTD or STD cast1989-08-09 04:47:0055.585 N, 5.75 WRV Lough Foyle LF2/89
318337CTD or STD cast1989-08-09 05:05:0055.6 N, 5.8167 WRV Lough Foyle LF2/89
318349CTD or STD cast1989-08-09 05:28:0055.6183 N, 5.8833 WRV Lough Foyle LF2/89
318350CTD or STD cast1989-08-09 05:54:0055.635 N, 5.95 WRV Lough Foyle LF2/89
318362CTD or STD cast1989-08-09 06:20:0055.6517 N, 6.0167 WRV Lough Foyle LF2/89
384334CTD or STD cast1991-11-29 00:58:0055.615 N, 5.8833 WRRS Challenger CH86B
384346CTD or STD cast1991-11-29 01:40:0055.6017 N, 5.8217 WRRS Challenger CH86B

Appendix 2: DML Line B Station 4B

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Series IdentifierData CategoryStart date/timeStart positionCruise
193267CTD or STD cast1983-05-22 17:52:0055.6333 N, 5.95 WRRS Challenger CH7A/83
96497CTD or STD cast1983-08-11 07:59:0055.6416 N, 5.95 WRRS Challenger CH11/83
97685CTD or STD cast1984-06-25 08:51:0055.6416 N, 5.95 WRRS Challenger CH2/84
258001CTD or STD cast1984-12-04 10:38:0055.6416 N, 5.9483 WRRS Challenger CH10/84
258793CTD or STD cast1985-01-30 08:28:0055.6416 N, 5.9483 WRRS Challenger CH1/85
253045CTD or STD cast1985-05-03 05:50:0055.6416 N, 5.95 WRRS Challenger CH4/85
260804CTD or STD cast1985-08-17 09:33:0055.6416 N, 5.9516 WRRS Challenger CH8/85
255457CTD or STD cast1985-12-10 23:50:0055.6416 N, 5.9566 WRRS Frederick Russell FR13/85
251211CTD or STD cast1987-05-05 11:45:0055.6416 N, 5.95 WRRS Challenger CH14
266431CTD or STD cast1989-05-09 21:19:0055.6333 N, 5.95 WRV Lough Foyle LF1/89
318350CTD or STD cast1989-08-09 05:54:0055.635 N, 5.95 WRV Lough Foyle LF2/89