Metadata Report for BODC Series Reference Number 387123


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 CH97/92/071
BODC Series Reference 387123
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1992-10-03 18:37
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars
 

Spatial Co-ordinates

Latitude 56.08170 N ( 56° 4.9' N )
Longitude 6.79170 W ( 6° 47.5' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 3.96 m
Maximum Sensor or Sampling Depth 49.54 m
Minimum Sensor or Sampling Height 3.46 m
Maximum Sensor or Sampling Height 49.04 m
Sea Floor Depth 53.0 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 97/92 CTD Data Documentation

Introduction

Documentation for the CTD data collected on RRS Challenger 97/92 (September - October 1992) 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 CH97
Departure Date 1992-09-25
Arrival Date 1992-10-06
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 P
CategoryOffshore route/traverse

DML Line P

Line P is a survey section between Skerryvore and Islay (off the west coast of Scotland). The line comprises seven 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 between the mid 1980s and mid 1990s.

Map of standard DML Line P CTD Stations

BODC image

Map produced using the GEBCO Digital Atlas.

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

Nominal station details

DML Line P: Skerryvore (Scotland) - Islay (Scotland)

Station Nominal latitude Nominal longitude Approx.
depth (m)
Comment
P1 56° 17.0' N 07° 05.0' W 65 Skerryvore
P2 56° 13.0' N 06° 59.0' W 75  
P3 56° 09.0' N 06° 53.0' W 55  
P4 56° 05.0' N 06° 47.0' W 50  
P5 56° 01.0' N 06° 41.0' W 55  
P6 55° 57.0' N 06° 35.0' W 50  
P7 55° 53.0' N 06° 29.0' W 25 Eil'n nam Meann (Islay)

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

Related Fixed Station activities are detailed in Appendix 1

Fixed Station Information

Station NameDML Line P Station P4
CategoryOffshore location
Latitude56° 5.00' N
Longitude6° 47.00' W
Water depth below MSL50.0 m

DML Station P4

Station P4 is one of seven fixed CTD stations between Skerryvore and Islay (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 Line P

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
254767CTD or STD cast1985-05-14 08:34:0056.285 N, 7.0866 WRRS Challenger CH4/85
254779CTD or STD cast1985-05-14 09:30:0056.2166 N, 6.9833 WRRS Challenger CH4/85
254780CTD or STD cast1985-05-14 10:26:0056.15 N, 6.8866 WRRS Challenger CH4/85
254792CTD or STD cast1985-05-14 11:27:0056.0833 N, 6.7816 WRRS Challenger CH4/85
254811CTD or STD cast1985-05-14 12:24:0056.0183 N, 6.6816 WRRS Challenger CH4/85
254823CTD or STD cast1985-05-14 13:22:0055.95 N, 6.5833 WRRS Challenger CH4/85
255642CTD or STD cast1985-12-13 20:20:0055.8833 N, 6.4833 WRRS Frederick Russell FR13/85
255654CTD or STD cast1985-12-13 21:15:0055.95 N, 6.5833 WRRS Frederick Russell FR13/85
255666CTD or STD cast1985-12-13 22:14:0056.0166 N, 6.6833 WRRS Frederick Russell FR13/85
255678CTD or STD cast1985-12-13 23:12:0056.0833 N, 6.7833 WRRS Frederick Russell FR13/85
255691CTD or STD cast1985-12-14 00:15:0056.1516 N, 6.8866 WRRS Frederick Russell FR13/85
255709CTD or STD cast1985-12-14 01:07:0056.2166 N, 6.9833 WRRS Frederick Russell FR13/85
255710CTD or STD cast1985-12-14 01:58:0056.2833 N, 7.0833 WRRS Frederick Russell FR13/85
343875CTD or STD cast1987-01-14 00:06:0055.9483 N, 6.5833 WRRS Challenger CH9
343887CTD or STD cast1987-01-14 01:00:0056.0183 N, 6.6867 WRRS Challenger CH9
343899CTD or STD cast1987-01-14 01:53:0056.085 N, 6.7867 WRRS Challenger CH9
343906CTD or STD cast1987-01-14 02:45:0056.1483 N, 6.885 WRRS Challenger CH9
343918CTD or STD cast1987-01-14 03:42:0056.215 N, 6.9817 WRRS Challenger CH9
343931CTD or STD cast1987-01-14 04:40:0056.2833 N, 7.0833 WRRS Challenger CH9
251118CTD or STD cast1987-05-05 02:46:0056.2833 N, 7.0833 WRRS Challenger CH14
251143CTD or STD cast1987-05-05 04:28:0056.1466 N, 6.8816 WRRS Challenger CH14
251155CTD or STD cast1987-05-05 05:17:0056.0816 N, 6.7733 WRRS Challenger CH14
251167CTD or STD cast1987-05-05 06:05:0056.0166 N, 6.6716 WRRS Challenger CH14
251179CTD or STD cast1987-05-05 06:56:0055.9516 N, 6.5783 WRRS Challenger CH14
251180CTD or STD cast1987-05-05 07:47:0055.8833 N, 6.4833 WRRS Challenger CH14
251813CTD or STD cast1987-11-28 23:04:0055.8833 N, 6.4816 WRRS Challenger CH22
251825CTD or STD cast1987-11-28 23:57:0055.95 N, 6.5816 WRRS Challenger CH22
251837CTD or STD cast1987-11-29 00:49:0056.0166 N, 6.68 WRRS Challenger CH22
251849CTD or STD cast1987-11-29 01:42:0056.0833 N, 6.7816 WRRS Challenger CH22
251850CTD or STD cast1987-11-29 02:33:0056.15 N, 6.8833 WRRS Challenger CH22
251862CTD or STD cast1987-11-29 03:22:0056.2166 N, 6.985 WRRS Challenger CH22
251874CTD or STD cast1987-11-29 04:14:0056.2816 N, 7.085 WRRS Challenger CH22
266209CTD or STD cast1989-05-08 19:30:0055.8833 N, 6.4833 WRV Lough Foyle LF1/89
266210CTD or STD cast1989-05-08 20:10:0055.95 N, 6.5833 WRV Lough Foyle LF1/89
266222CTD or STD cast1989-05-08 20:54:0056.0166 N, 6.6833 WRV Lough Foyle LF1/89
266234CTD or STD cast1989-05-08 21:44:0056.0833 N, 6.7833 WRV Lough Foyle LF1/89
266246CTD or STD cast1989-05-08 22:39:0056.15 N, 6.8833 WRV Lough Foyle LF1/89
266258CTD or STD cast1989-05-08 23:38:0056.2166 N, 6.9833 WRV Lough Foyle LF1/89
266271CTD or STD cast1989-05-09 00:32:0056.2833 N, 7.0833 WRV Lough Foyle LF1/89
318429CTD or STD cast1989-08-09 13:36:0055.8833 N, 6.4833 WRV Lough Foyle LF2/89
318430CTD or STD cast1989-08-09 14:09:0055.95 N, 6.5833 WRV Lough Foyle LF2/89
318442CTD or STD cast1989-08-09 14:50:0056.0167 N, 6.6833 WRV Lough Foyle LF2/89
318454CTD or STD cast1989-08-09 15:34:0056.0833 N, 6.7867 WRV Lough Foyle LF2/89
318466CTD or STD cast1989-08-09 16:19:0056.15 N, 6.8833 WRV Lough Foyle LF2/89
318478CTD or STD cast1989-08-09 17:12:0056.2183 N, 6.985 WRV Lough Foyle LF2/89
318491CTD or STD cast1989-08-09 17:51:0056.2833 N, 7.0833 WRV Lough Foyle LF2/89
386709CTD or STD cast1992-09-30 23:07:0056.28 N, 7.0833 WRRS Challenger CH97
386710CTD or STD cast1992-09-30 23:57:0056.2167 N, 6.9867 WRRS Challenger CH97
386722CTD or STD cast1992-10-01 00:50:0056.15 N, 6.8833 WRRS Challenger CH97
386734CTD or STD cast1992-10-01 01:36:0056.0833 N, 6.785 WRRS Challenger CH97
386746CTD or STD cast1992-10-01 02:22:0056.015 N, 6.6833 WRRS Challenger CH97
386758CTD or STD cast1992-10-01 03:10:0055.9517 N, 6.585 WRRS Challenger CH97
386771CTD or STD cast1992-10-01 03:57:0055.89 N, 6.4833 WRRS Challenger CH97
387080CTD or STD cast1992-10-03 16:03:0056.2783 N, 7.095 WRRS Challenger CH97
387092CTD or STD cast1992-10-03 16:50:0056.2183 N, 6.9833 WRRS Challenger CH97
387111CTD or STD cast1992-10-03 17:43:0056.1517 N, 6.8817 WRRS Challenger CH97
387135CTD or STD cast1992-10-03 19:25:0056.0183 N, 6.6833 WRRS Challenger CH97
387147CTD or STD cast1992-10-03 20:15:0055.95 N, 6.58 WRRS Challenger CH97
387159CTD or STD cast1992-10-03 21:04:0055.8867 N, 6.4817 WRRS Challenger CH97
389640CTD or STD cast1994-05-09 16:30:0056.2833 N, 7.0833 WRRS Challenger CH112
389652CTD or STD cast1994-05-09 17:17:0056.2167 N, 6.9848 WRRS Challenger CH112
389664CTD or STD cast1994-05-09 18:03:0056.15 N, 6.8833 WRRS Challenger CH112
389676CTD or STD cast1994-05-09 18:44:0056.0833 N, 6.7833 WRRS Challenger CH112
389688CTD or STD cast1994-05-09 19:27:0056.0167 N, 6.6833 WRRS Challenger CH112
389707CTD or STD cast1994-05-09 20:12:0055.95 N, 6.5833 WRRS Challenger CH112
389719CTD or STD cast1994-05-09 20:59:0055.8833 N, 6.4833 WRRS Challenger CH112

Appendix 2: DML Line P Station P4

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
254792CTD or STD cast1985-05-14 11:27:0056.0833 N, 6.7816 WRRS Challenger CH4/85
255678CTD or STD cast1985-12-13 23:12:0056.0833 N, 6.7833 WRRS Frederick Russell FR13/85
343899CTD or STD cast1987-01-14 01:53:0056.085 N, 6.7867 WRRS Challenger CH9
251155CTD or STD cast1987-05-05 05:17:0056.0816 N, 6.7733 WRRS Challenger CH14
251849CTD or STD cast1987-11-29 01:42:0056.0833 N, 6.7816 WRRS Challenger CH22
266234CTD or STD cast1989-05-08 21:44:0056.0833 N, 6.7833 WRV Lough Foyle LF1/89
318454CTD or STD cast1989-08-09 15:34:0056.0833 N, 6.7867 WRV Lough Foyle LF2/89
386734CTD or STD cast1992-10-01 01:36:0056.0833 N, 6.785 WRRS Challenger CH97
389676CTD or STD cast1994-05-09 18:44:0056.0833 N, 6.7833 WRRS Challenger CH112