Metadata Report for BODC Series Reference Number 384740


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 CH86/91/052
BODC Series Reference 384740
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1991-12-01 12:17
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars
 

Spatial Co-ordinates

Latitude 55.35670 N ( 55° 21.4' N )
Longitude 5.37170 W ( 5° 22.3' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 0.99 m
Maximum Sensor or Sampling Depth 43.6 m
Minimum Sensor or Sampling Height 4.4 m
Maximum Sensor or Sampling Height 47.01 m
Sea Floor Depth 48.0 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 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

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 Clyde Stations
CategoryOffshore area
Latitude55° 32.50' N
Longitude5° 12.50' W
Water depth below MSL

DML Clyde Stations

The Clyde Stations are a group of survey stations circling the Isle of Arran in the Firth of Clyde (Scotland). The group comprises 14 fixed CTD stations, which were established as part of routine monitoring work on the Scottish continental shelf by Dunstaffnage Marine Laboratory (DML). The Clyde Stations were occupied during the 1980s and 1990s.

Map of standard DML Clyde CTD Stations

BODC image

Map produced using the GEBCO Digital Atlas.

The white triangles indicate the nominal positions of each standard DML Clyde Station.

Nominal station details

DML Clyde Stations: Firth of Clyde

Station Nominal latitude Nominal longitude Approx.
depth (m)
Comment
CL1 55° 17.0' N 05° 17.0' W 44 Great Plateau
CL2 55° 21.0' N 05° 22.0' W 45  
CL3 55° 26.0' N 05° 26.0' W 30  
CL4 55° 31.0' N 05° 26.0' W 72  
CL5 55° 35.0' N 05° 25.0' W 115 Off Carradale
CL6 55° 39.0' N 05° 26.0' W 150  
CL7 55° 43.0' N 05° 19.5' W 120  
CL8 55° 48.0' N 05° 15.0' W 150 West of Inchmarnock
CL9 55° 44.0' N 05° 11.0' W 150  
CL10 55° 40.0' N 05° 04.0' W 162  
CL11 55° 36.0' N 04° 59.0' W 130  
CL12 55° 31.0' N 04° 59.5' W 110 Off Holy Island
CL13 55° 26.0' N 05° 02.0' W 124  
CL14 55° 21.0' N 05° 04.0' W 52  

Related Fixed Station activities are detailed in Appendix 1

Fixed Station Information

Station NameDML Clyde Station CL2
CategoryOffshore location
Latitude55° 21.00' N
Longitude5° 22.00' W
Water depth below MSL45.0 m

DML Clyde Station CL2

DML Clyde Station CL2 is one of 14 fixed CTD stations circling the Isle of Arran in the Firth of Clyde, Scotland. The station was 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 Clyde Stations

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
257292CTD or STD cast1984-11-18 23:06:0055.4333 N, 5.0333 WRRS Challenger CH10/84
257311CTD or STD cast1984-11-19 01:57:0055.6 N, 4.9833 WRRS Challenger CH10/84
258246CTD or STD cast1984-12-06 02:19:0055.5833 N, 5.4166 WRRS Challenger CH10/84
259458CTD or STD cast1985-02-04 19:09:0055.5766 N, 5.4133 WRRS Challenger CH1/85
253125CTD or STD cast1985-05-04 02:12:0055.5783 N, 5.4116 WRRS Challenger CH4/85
260423CTD or STD cast1985-08-15 05:38:0055.5766 N, 5.41 WRRS Challenger CH8/85
262208CTD or STD cast1985-12-06 19:43:0055.575 N, 5.4083 WRRS Frederick Russell FR13/85
345126CTD or STD cast1986-06-07 03:38:0055.2667 N, 5.3 WMV Dawn Sky DSK1/86
345138CTD or STD cast1986-06-07 04:02:0055.2833 N, 5.2667 WMV Dawn Sky DSK1/86
345292CTD or STD cast1986-06-08 05:39:0055.65 N, 5.4333 WMV Dawn Sky DSK1/86
345311CTD or STD cast1986-06-08 06:27:0055.7 N, 5.35 WMV Dawn Sky DSK1/86
347667CTD or STD cast1986-09-23 17:01:0055.7 N, 5.35 WRRS Frederick Russell FR8/86
347679CTD or STD cast1986-09-23 18:33:0055.65 N, 5.4333 WRRS Frederick Russell FR8/86
344577CTD or STD cast1987-01-21 23:16:0055.65 N, 5.43 WRRS Challenger CH9
382991CTD or STD cast1987-03-20 00:45:0055.65 N, 5.4317 WRRS Frederick Russell FR13/87
383226CTD or STD cast1987-03-21 11:12:0055.6 N, 4.9783 WRRS Frederick Russell FR13/87
249790CTD or STD cast1987-04-24 19:13:0055.435 N, 5.0266 WRRS Challenger CH14
249986CTD or STD cast1987-04-25 18:19:0055.6516 N, 5.435 WRRS Challenger CH14
349895CTD or STD cast1987-06-21 19:13:0055.7 N, 5.35 WRRS Frederick Russell FR14B/87
384752CTD or STD cast1991-12-01 13:08:0055.435 N, 5.4283 WRRS Challenger CH86B
384764CTD or STD cast1991-12-01 13:54:0055.5167 N, 5.4383 WRRS Challenger CH86B
384776CTD or STD cast1991-12-01 14:39:0055.585 N, 5.4183 WRRS Challenger CH86B
384788CTD or STD cast1991-12-01 15:23:0055.6567 N, 5.43 WRRS Challenger CH86B
384807CTD or STD cast1991-12-01 16:16:0055.725 N, 5.3183 WRRS Challenger CH86B
384819CTD or STD cast1991-12-01 17:05:0055.8033 N, 5.255 WRRS Challenger CH86B
384820CTD or STD cast1991-12-01 18:06:0055.73 N, 5.1833 WRRS Challenger CH86B
384832CTD or STD cast1991-12-01 19:00:0055.675 N, 5.0683 WRRS Challenger CH86B
384844CTD or STD cast1991-12-01 19:53:0055.6 N, 4.9833 WRRS Challenger CH86B
384856CTD or STD cast1991-12-01 20:46:0055.52 N, 4.99 WRRS Challenger CH86B
384868CTD or STD cast1991-12-01 21:31:0055.4417 N, 5.0333 WRRS Challenger CH86B
384881CTD or STD cast1991-12-01 22:17:0055.3583 N, 5.0733 WRRS Challenger CH86B
384900CTD or STD cast1991-12-02 00:35:0055.44 N, 5.0383 WRRS Challenger CH86B
384924CTD or STD cast1991-12-02 03:04:0055.44 N, 5.0333 WRRS Challenger CH86B
384948CTD or STD cast1991-12-02 05:32:0055.4383 N, 5.04 WRRS Challenger CH86B
387412CTD or STD cast1992-10-04 22:48:0055.35 N, 5.0667 WRRS Challenger CH97
387424CTD or STD cast1992-10-04 23:35:0055.4333 N, 5.0333 WRRS Challenger CH97
387436CTD or STD cast1992-10-05 00:31:0055.515 N, 4.9817 WRRS Challenger CH97
387448CTD or STD cast1992-10-05 01:23:0055.6017 N, 4.9833 WRRS Challenger CH97
387461CTD or STD cast1992-10-05 02:16:0055.6667 N, 5.0667 WRRS Challenger CH97
387473CTD or STD cast1992-10-05 03:10:0055.7317 N, 5.1817 WRRS Challenger CH97
387485CTD or STD cast1992-10-05 03:59:0055.7967 N, 5.2483 WRRS Challenger CH97
387497CTD or STD cast1992-10-05 04:51:0055.72 N, 5.325 WRRS Challenger CH97
387516CTD or STD cast1992-10-05 06:27:0055.585 N, 5.4183 WRRS Challenger CH97
387528CTD or STD cast1992-10-05 07:10:0055.5133 N, 5.4333 WRRS Challenger CH97
387541CTD or STD cast1992-10-05 07:54:0055.4317 N, 5.435 WRRS Challenger CH97
387553CTD or STD cast1992-10-05 08:40:0055.3517 N, 5.3667 WRRS Challenger CH97
387565CTD or STD cast1992-10-05 09:22:0055.2817 N, 5.2833 WRRS Challenger CH97
385398CTD or STD cast1993-03-17 18:30:0055.2783 N, 5.2783 WRRS Challenger CH101B
385405CTD or STD cast1993-03-17 20:21:0055.3517 N, 5.365 WRRS Challenger CH101B
385417CTD or STD cast1993-03-17 21:40:0055.4317 N, 5.44 WRRS Challenger CH101B
385429CTD or STD cast1993-03-17 22:32:0055.5167 N, 5.435 WRRS Challenger CH101B
385430CTD or STD cast1993-03-18 00:16:0055.58 N, 5.4133 WRRS Challenger CH101B
385442CTD or STD cast1993-03-18 01:09:0055.6517 N, 5.4333 WRRS Challenger CH101B
385454CTD or STD cast1993-03-18 02:52:0055.7183 N, 5.3167 WRRS Challenger CH101B
385466CTD or STD cast1993-03-18 03:58:0055.8 N, 5.25 WRRS Challenger CH101B
385478CTD or STD cast1993-03-18 05:29:0055.7367 N, 5.1783 WRRS Challenger CH101B
385491CTD or STD cast1993-03-18 06:29:0055.6633 N, 5.0683 WRRS Challenger CH101B
385509CTD or STD cast1993-03-18 08:23:0055.6 N, 5.0 WRRS Challenger CH101B
385510CTD or STD cast1993-03-18 09:11:0055.515 N, 4.985 WRRS Challenger CH101B
385522CTD or STD cast1993-03-18 10:53:0055.4267 N, 5.0483 WRRS Challenger CH101B
385534CTD or STD cast1993-03-18 11:45:0055.3483 N, 5.0667 WRRS Challenger CH101B
386107CTD or STD cast1993-05-21 21:07:0055.285 N, 5.2833 WRRS Challenger CH103
386120CTD or STD cast1993-05-21 23:16:0055.36 N, 5.0633 WRRS Challenger CH103
386297CTD or STD cast1993-05-23 05:03:0055.5733 N, 5.4233 WRRS Challenger CH103
386304CTD or STD cast1993-05-23 05:44:0055.5017 N, 5.4383 WRRS Challenger CH103
388440CTD or STD cast1993-09-15 03:09:0055.3657 N, 5.0785 WRRS Challenger CH105
388532CTD or STD cast1993-09-15 15:13:0055.7108 N, 5.332 WRRS Challenger CH105
388556CTD or STD cast1993-09-15 17:23:0055.574 N, 5.423 WRRS Challenger CH105
388568CTD or STD cast1993-09-15 18:27:0055.5027 N, 5.4418 WRRS Challenger CH105
388697CTD or STD cast1994-03-10 18:58:0055.5017 N, 5.4383 WRRS Challenger CH110
388704CTD or STD cast1994-03-10 19:44:0055.5733 N, 5.4233 WRRS Challenger CH110
388882CTD or STD cast1994-03-11 22:30:0055.3585 N, 5.072 WRRS Challenger CH110
433741CTD or STD cast1996-01-10 10:16:0055.2833 N, 5.2833 WRRS Challenger CH124
433753CTD or STD cast1996-01-10 11:22:0055.35 N, 5.3667 WRRS Challenger CH124
433765CTD or STD cast1996-01-10 12:42:0055.4333 N, 5.4333 WRRS Challenger CH124
433777CTD or STD cast1996-01-10 13:32:0055.5167 N, 5.4333 WRRS Challenger CH124
433789CTD or STD cast1996-01-10 14:22:0055.5833 N, 5.4167 WRRS Challenger CH124
433790CTD or STD cast1996-01-10 15:21:0055.65 N, 5.4333 WRRS Challenger CH124
433808CTD or STD cast1996-01-10 16:26:0055.7167 N, 5.325 WRRS Challenger CH124
433821CTD or STD cast1996-01-10 17:32:0055.8 N, 5.25 WRRS Challenger CH124
433833CTD or STD cast1996-01-10 18:28:0055.7333 N, 5.1833 WRRS Challenger CH124
433845CTD or STD cast1996-01-10 19:35:0055.6667 N, 5.0667 WRRS Challenger CH124
433857CTD or STD cast1996-01-10 20:32:0055.6 N, 4.9833 WRRS Challenger CH124
433869CTD or STD cast1996-01-10 21:39:0055.5167 N, 4.9917 WRRS Challenger CH124
433870CTD or STD cast1996-01-10 22:58:0055.4333 N, 5.0333 WRRS Challenger CH124
433882CTD or STD cast1996-01-10 23:54:0055.35 N, 5.0667 WRRS Challenger CH124

Appendix 2: DML Clyde Station CL2

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
387553CTD or STD cast1992-10-05 08:40:0055.3517 N, 5.3667 WRRS Challenger CH97
385405CTD or STD cast1993-03-17 20:21:0055.3517 N, 5.365 WRRS Challenger CH101B
433753CTD or STD cast1996-01-10 11:22:0055.35 N, 5.3667 WRRS Challenger CH124