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Metadata Report for BODC Series Reference Number 258873


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Bissett-Bermann 9040 CTD system  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) -
 

Data Identifiers

Originator's Identifier C185/054
BODC Series Reference 258873
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1985-01-31 03:29
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 56.13330 N ( 56° 8.0' N )
Longitude 5.93330 W ( 5° 56.0' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 4.46 m
Maximum Sensor or Sampling Depth 94.71 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 -
 

Parameters

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

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 Cruise 1/85 CTD Data Documentation

Introduction

Documentation for the CTD data collected on RRS Challenger Cruise 1/85 (Jan-Feb 1985) by the Scottish Marine Biological Association, Oban, Argyll, Scotland, UK, under the direction of D. J. Ellett.

Instrumentation

The instrument used was a Bissett Berman 9040 CTD system and the data were logged on a Hewlett Packard 9820 and stored in an integer format. 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

The CTD was not calibrated in the laboratory. The manufacturer's calibration was used and water samples taken to check the calibration and apply corrections where necessary.

Temperature

The manufacturer's calibration was used to convert the raw data to to physical units using the equation below:

Temperature (°C) = (10**6/Pt -2238.68/55.84)

where Pt is the temperature period in microseconds

These values were then plotted against the water bottle (i.e. reversing thermometer) temperatures and a regression line fitted to the data such that:

Temperature(WB) = m x Temperature(CTD) + c

Then the regression coefficients (m and c) were applied to correct the CTD temperature data - these are given in the table below.

Conductivity

The manufacturer's calibration was used to convert the raw data to to physical units using the equation below:

Conductivity (mmho/cm) = (10**6/Pc - 4995)/58.12 + 10

where Pc is the conductivity period in microseconds

The water bottle salinities and corrected CTD temperatures were used to calculate the water bottle conductivity values. These values were then plotted against the CTD conductivities and a regression line fitted to the data such that:

Conductivity(WB) = m x Conductivity(CTD) + c

Then the regression coefficients were applied to correct the CTD conductivity data - these are given in the table below.

Pressure

The depths from the acoustic pinger were noted where the bottle samples were taken and then used to check the calibration of the pressure sensor - unless calibration values were available from the reversing thermometers. The equation below was used to convert the pressure period to physical units.

Pressure = (10**6/Pd - 9712)/0.26267

where Pd is the pressure period in microseconds

A regression fit was carried out using the calibration values and the slope and intercept determined. The pressure values could then be corrected using:

Pressure (CORR) = m x Pressure(CTD) + c

The fit of the CTD data to the water bottle calibration data is given in the table below:

Variable Slope (m) Intercept (c)
Temperature (°C) 1.0031453 0.031688
Conductivity (mmho/cm) 1.0065769 -0.167336
Pressure (dbar) 1.0019709 7.660305

Data Processing

Obvious wild points were edited out of the calibration file and the calibration programs run to obtain values for the slopes and intercepts for temperature, pressure and conductivity. These were then applied to the uncalibrated data. 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.

References

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


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name CH1/85
Departure Date 1985-01-20
Arrival Date 1985-02-05
Principal Scientist(s)David J Ellett (Scottish Marine Biological Association)
Ship RRS Challenger

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameDML Line E
CategoryOffshore route/traverse

DML Line E

Line E is a survey section crossing the Firth of Lorne, between the Isles of Jura and Mull (off 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 in the 1980s.

Map of standard DML Line E 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 E.

Nominal station details

DML Line E: Firth of Lorne (Scotland)

Station Nominal latitude Nominal longitude Approx.
depth (m)
Comment
1E 56° 05.5' N 05° 53.0' W 90 Glendebadel Bay (Jura)
2E 56° 08.0' N 05° 55.8' W 75  
3E 56° 11.0' N 08° 59.0' W 90  
4E 56° 14.0' N 06° 02.2' W 80  
5E 56° 16.5' N 06° 05.0' W 95 Malcolm's Point (Mull)

Related Fixed Station activities are detailed in Appendix 1

Fixed Station Information

Station NameDML Line E Station 2E
CategoryOffshore location
Latitude56° 8.00' N
Longitude5° 55.80' W
Water depth below MSL75.0 m

DML Station 2E

Station 2E is one of five fixed CTD stations crossing the Firth of Lorne, between Jura and Mull (off the west coast of 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 E

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
191285CTD or STD cast1981-07-06 15:27:0056.1316 N, 5.9483 WRRS Challenger CH10/81
191297CTD or STD cast1981-07-06 17:05:0056.1816 N, 5.9916 WRRS Challenger CH10/81
191304CTD or STD cast1981-07-06 17:42:0056.2233 N, 6.0333 WRRS Challenger CH10/81
191316CTD or STD cast1981-07-06 18:15:0056.2516 N, 6.095 WRRS Challenger CH10/81
96424CTD or STD cast1983-08-10 22:30:0056.275 N, 6.0833 WRRS Challenger CH11/83
96436CTD or STD cast1983-08-10 23:50:0056.2333 N, 6.0333 WRRS Challenger CH11/83
96448CTD or STD cast1983-08-11 00:37:0056.1833 N, 5.9833 WRRS Challenger CH11/83
96473CTD or STD cast1983-08-11 02:10:0056.0916 N, 5.8833 WRRS Challenger CH11/83
313959CTD or STD cast1984-07-04 02:11:0056.275 N, 6.08 WRRS Challenger CH2/84
313960CTD or STD cast1984-07-04 02:55:0056.2333 N, 6.0333 WRRS Challenger CH2/84
313972CTD or STD cast1984-07-04 03:36:0056.1817 N, 5.9833 WRRS Challenger CH2/84
313984CTD or STD cast1984-07-04 04:30:0056.1333 N, 5.9333 WRRS Challenger CH2/84
313996CTD or STD cast1984-07-04 04:58:0056.1083 N, 5.9167 WRRS Challenger CH2/84
257869CTD or STD cast1984-11-26 01:06:0056.28 N, 6.0866 WRRS Challenger CH10/84
257870CTD or STD cast1984-11-26 01:44:0056.2333 N, 6.0333 WRRS Challenger CH10/84
257882CTD or STD cast1984-11-26 02:30:0056.1833 N, 5.9833 WRRS Challenger CH10/84
257894CTD or STD cast1984-11-26 03:13:0056.1333 N, 5.9333 WRRS Challenger CH10/84
257901CTD or STD cast1984-11-26 03:48:0056.0916 N, 5.8833 WRRS Challenger CH10/84
258836CTD or STD cast1985-01-31 01:27:0056.275 N, 6.0833 WRRS Challenger CH1/85
258848CTD or STD cast1985-01-31 02:08:0056.2333 N, 6.0333 WRRS Challenger CH1/85
258861CTD or STD cast1985-01-31 02:51:0056.1833 N, 5.9833 WRRS Challenger CH1/85
258885CTD or STD cast1985-01-31 04:09:0056.0916 N, 5.8833 WRRS Challenger CH1/85
252957CTD or STD cast1985-05-02 19:34:0056.275 N, 6.0866 WRRS Challenger CH4/85
252969CTD or STD cast1985-05-02 20:17:0056.235 N, 6.03 WRRS Challenger CH4/85
252970CTD or STD cast1985-05-02 21:05:0056.1833 N, 5.9816 WRRS Challenger CH4/85
252982CTD or STD cast1985-05-02 21:51:0056.135 N, 5.9316 WRRS Challenger CH4/85
252994CTD or STD cast1985-05-02 22:35:0056.0933 N, 5.8833 WRRS Challenger CH4/85
261008CTD or STD cast1985-08-18 15:08:0056.0916 N, 5.8833 WRRS Challenger CH8/85
261021CTD or STD cast1985-08-18 16:05:0056.1333 N, 5.935 WRRS Challenger CH8/85
261033CTD or STD cast1985-08-18 16:49:0056.185 N, 5.9833 WRRS Challenger CH8/85
261045CTD or STD cast1985-08-18 17:34:0056.235 N, 6.0333 WRRS Challenger CH8/85
261057CTD or STD cast1985-08-18 18:17:0056.275 N, 6.085 WRRS Challenger CH8/85
255722CTD or STD cast1985-12-14 05:43:0056.275 N, 6.0933 WRRS Frederick Russell FR13/85
255734CTD or STD cast1985-12-14 06:19:0056.23 N, 6.035 WRRS Frederick Russell FR13/85
255746CTD or STD cast1985-12-14 06:53:0056.1816 N, 5.985 WRRS Frederick Russell FR13/85
255758CTD or STD cast1985-12-14 07:26:0056.1316 N, 5.9316 WRRS Frederick Russell FR13/85
255771CTD or STD cast1985-12-14 07:56:0056.095 N, 5.885 WRRS Frederick Russell FR13/85
345937CTD or STD cast1986-06-12 23:59:0056.275 N, 6.0833 WMV Dawn Sky DSK1/86
345949CTD or STD cast1986-06-13 00:53:0056.2333 N, 6.0367 WMV Dawn Sky DSK1/86
345950CTD or STD cast1986-06-13 01:56:0056.1833 N, 5.9833 WMV Dawn Sky DSK1/86
345962CTD or STD cast1986-06-13 02:52:0056.1333 N, 5.93 WMV Dawn Sky DSK1/86
345974CTD or STD cast1986-06-13 03:36:0056.0917 N, 5.8833 WMV Dawn Sky DSK1/86
346560CTD or STD cast1986-08-27 12:10:0056.2583 N, 6.0917 WRRS Frederick Russell FR7B/86
346572CTD or STD cast1986-08-27 13:06:0056.235 N, 6.0367 WRRS Frederick Russell FR7B/86
346584CTD or STD cast1986-08-27 13:45:0056.1833 N, 5.9817 WRRS Frederick Russell FR7B/86
346596CTD or STD cast1986-08-27 14:39:0056.1333 N, 5.93 WRRS Frederick Russell FR7B/86
346603CTD or STD cast1986-08-27 15:16:0056.0917 N, 5.8833 WRRS Frederick Russell FR7B/86
346768CTD or STD cast1986-09-17 19:54:0056.235 N, 6.0333 WRRS Frederick Russell FR8/86
346781CTD or STD cast1986-09-17 22:26:0056.1833 N, 5.9833 WRRS Frederick Russell FR8/86
346793CTD or STD cast1986-09-17 23:38:0056.1317 N, 5.94 WRRS Frederick Russell FR8/86
346800CTD or STD cast1986-09-18 02:43:0056.09 N, 5.8683 WRRS Frederick Russell FR8/86
343802CTD or STD cast1987-01-13 17:51:0056.2733 N, 6.0833 WRRS Challenger CH9
343814CTD or STD cast1987-01-13 18:35:0056.2333 N, 6.035 WRRS Challenger CH9
343826CTD or STD cast1987-01-13 19:22:0056.1817 N, 5.9833 WRRS Challenger CH9
343838CTD or STD cast1987-01-13 20:07:0056.1367 N, 5.9333 WRRS Challenger CH9
343851CTD or STD cast1987-01-13 20:44:0056.095 N, 5.8867 WRRS Challenger CH9
343979CTD or STD cast1987-01-14 17:20:0056.2333 N, 6.0333 WRRS Challenger CH9
384045CTD or STD cast1987-03-26 13:37:0056.2333 N, 6.0333 WRRS Frederick Russell FR13/87
384057CTD or STD cast1987-03-26 15:28:0056.1833 N, 5.9833 WRRS Frederick Russell FR13/87
384069CTD or STD cast1987-03-26 16:38:0056.13 N, 5.93 WRRS Frederick Russell FR13/87
384070CTD or STD cast1987-03-26 18:15:0056.0833 N, 5.8833 WRRS Frederick Russell FR13/87
384082CTD or STD cast1987-03-26 19:52:0056.235 N, 6.03 WRRS Frederick Russell FR13/87
250705CTD or STD cast1987-05-01 16:19:0056.2716 N, 6.09 WRRS Challenger CH14
250717CTD or STD cast1987-05-01 16:52:0056.2333 N, 6.0333 WRRS Challenger CH14
251260CTD or STD cast1987-05-05 18:38:0056.1333 N, 5.9333 WRRS Challenger CH14
251272CTD or STD cast1987-05-05 19:20:0056.185 N, 5.985 WRRS Challenger CH14
251284CTD or STD cast1987-05-05 20:06:0056.2333 N, 6.0333 WRRS Challenger CH14
251296CTD or STD cast1987-05-05 20:48:0056.275 N, 6.085 WRRS Challenger CH14
343408CTD or STD cast1987-06-28 10:38:0056.2333 N, 6.0333 WRRS Frederick Russell FR14B/87
343421CTD or STD cast1987-06-28 11:54:0056.2667 N, 6.0833 WRRS Frederick Russell FR14B/87
343433CTD or STD cast1987-06-28 12:44:0056.2333 N, 6.0333 WRRS Frederick Russell FR14B/87
343445CTD or STD cast1987-06-28 13:55:0056.1833 N, 5.9833 WRRS Frederick Russell FR14B/87
343457CTD or STD cast1987-06-28 14:51:0056.1333 N, 5.9333 WRRS Frederick Russell FR14B/87
343469CTD or STD cast1987-06-28 16:27:0056.0833 N, 5.8833 WRRS Frederick Russell FR14B/87
266283CTD or STD cast1989-05-09 05:13:0056.1 N, 5.8833 WRV Lough Foyle LF1/89
266295CTD or STD cast1989-05-09 05:43:0056.1333 N, 5.9333 WRV Lough Foyle LF1/89
266302CTD or STD cast1989-05-09 06:20:0056.1833 N, 5.9833 WRV Lough Foyle LF1/89
266314CTD or STD cast1989-05-09 06:58:0056.2333 N, 6.0333 WRV Lough Foyle LF1/89
266326CTD or STD cast1989-05-09 07:38:0056.2833 N, 6.0833 WRV Lough Foyle LF1/89
318374CTD or STD cast1989-08-09 08:55:0056.0933 N, 5.8817 WRV Lough Foyle LF2/89
318386CTD or STD cast1989-08-09 09:24:0056.1333 N, 5.9283 WRV Lough Foyle LF2/89
318398CTD or STD cast1989-08-09 09:57:0056.1833 N, 5.9833 WRV Lough Foyle LF2/89
318405CTD or STD cast1989-08-09 10:28:0056.2333 N, 6.035 WRV Lough Foyle LF2/89
318417CTD or STD cast1989-08-09 10:57:0056.275 N, 6.0833 WRV Lough Foyle LF2/89

Appendix 2: DML Line E Station 2E

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
191285CTD or STD cast1981-07-06 15:27:0056.1316 N, 5.9483 WRRS Challenger CH10/81
313984CTD or STD cast1984-07-04 04:30:0056.1333 N, 5.9333 WRRS Challenger CH2/84
257894CTD or STD cast1984-11-26 03:13:0056.1333 N, 5.9333 WRRS Challenger CH10/84
252982CTD or STD cast1985-05-02 21:51:0056.135 N, 5.9316 WRRS Challenger CH4/85
261021CTD or STD cast1985-08-18 16:05:0056.1333 N, 5.935 WRRS Challenger CH8/85
255758CTD or STD cast1985-12-14 07:26:0056.1316 N, 5.9316 WRRS Frederick Russell FR13/85
345962CTD or STD cast1986-06-13 02:52:0056.1333 N, 5.93 WMV Dawn Sky DSK1/86
346596CTD or STD cast1986-08-27 14:39:0056.1333 N, 5.93 WRRS Frederick Russell FR7B/86
346793CTD or STD cast1986-09-17 23:38:0056.1317 N, 5.94 WRRS Frederick Russell FR8/86
343838CTD or STD cast1987-01-13 20:07:0056.1367 N, 5.9333 WRRS Challenger CH9
384069CTD or STD cast1987-03-26 16:38:0056.13 N, 5.93 WRRS Frederick Russell FR13/87
251260CTD or STD cast1987-05-05 18:38:0056.1333 N, 5.9333 WRRS Challenger CH14
343457CTD or STD cast1987-06-28 14:51:0056.1333 N, 5.9333 WRRS Frederick Russell FR14B/87
266295CTD or STD cast1989-05-09 05:43:0056.1333 N, 5.9333 WRV Lough Foyle LF1/89
318386CTD or STD cast1989-08-09 09:24:0056.1333 N, 5.9283 WRV Lough Foyle LF2/89