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Metadata Report for BODC Series Reference Number 90072


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Bissett-Bermann 9006 STD 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 C775/031
BODC Series Reference 90072
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1975-05-05 21:00
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 57.00000 N ( 57° 0.0' N )
Longitude 9.05000 W ( 9° 3.0' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 30.71 m
Maximum Sensor or Sampling Depth 126.88 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
SSALPR011Parts per thousandSalinity of the water body by conductivity cell
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

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."


Narrative Documents

Bissett-Berman 9060 Salinity Temperature and Depth

The B-B 9060 STD measured salinity, temperature and depth and whose analogue output was in graphical form. The plots created were of salinity and temperature versus depth which had to be manually digitised.

RRS Challenger 7/75 STD Data Documentation

Introduction

Documentation for the STD data collected on RRS Challenger Cruise 7/75 (May 1975) by the Scottish Marine Biological Association, Oban, Argyll, Scotland, UK, under the direction of D. J. Ellett.

Note that SMBA commented that for cast C775/027 (BODC Series Reference 90035) that the salinity from bottle sample was doubtful.

Instrumentation

The instrument used was a Bissett Berman STD system and the data were logged on a Hewlett Packard 9820. Instrument lowering and raising speeds between 0.5 m/s and 1 m/s. An acoustic pinger was placed above the STD to give an accurate depth measurement, this could then be used to check the STD pressure calibration. An NIO bottle with reversing thermometers was placed above the pinger, within 2m of the STD 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 STD 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 physical units using the equation below:

Temperature (°C) = (106 /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(STD) + c

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

Salinity

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

Salinity (ppt) = (106 /Ps - 4995)/290.6 + 30
where Ps is the salinity period in microseconds

These values were then plotted against the STD salinity and a regression line fitted to the data such that:

Salinity(WB) = m x Salinity(STD) + c + (m1 x Pressure + c1)/1000

Then the regression coefficients were applied to correct the STD salinity data. The data showed a salinity - pressure dependency, this was corrected by plotting delta-S (i.e. calibrated salinity - calculated salinity) against pressure to determine the slope (m1) and intercept (c1). These were then incorporated into the equation as shown above. The regression coefficients 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 = (106 /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(STD) + c

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

Variable Slope (m) Intercept (c) Standard
Deviation
Temperature (°C) 0.9993 0.0561 0.009
Salinity (ppt) 0.8674 4.6819 0.013
Pressure (dbar) 0.5031 -4.0269 2.792
Delta-S -0.0042 11.8581 10.043

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 salinity. These were then applied to the uncalibrated data 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.

Reference

Sharples, F. (1987).
A new data bank of SMBA STD/CTD observations in the Rockall Trough 1975-84. SMBA Marine Physics Group Report No. 36.

Graham, J.M., Sharples, F., Meldrum, D.T. and Edwards, A. (1987).
STD observations in the Rockall Trough 1975-77. SMBA Marine Physics Group Report No. 39.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name CH7A/75
Departure Date 1975-05-01
Arrival Date 1975-05-06
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 Shelf Edge Line L Station L8
CategoryOffshore location
Latitude56° 58.50' N
Longitude9° 4.00' W
Water depth below MSL145.0 m

DML Shelf Edge Station L8

Shelf edge station L8 is one of 11 fixed STD/CTD stations striding the shelf edge to the south east of the Anton Dohrn Seamount. The station was established by scientists at Dunstaffnage Marine Laboratory (DML).

Related Fixed Station activities are detailed in Appendix 1

Fixed Station Information

Station NameDML Shelf Edge Line L
CategoryOffshore route/traverse

DML Shelf Edge Line L

Shelf Edge Line L is a north east - south west orientated survey section striding the shelf edge to the west of Scotland. The section comprises fixed STD/CTD stations, which were surveyed by Dunstaffnage Marine Laboratory (DML), predominantly during 1993 and 1994.

Map of standard DML Shelf Edge Line L STD/CTD Stations

BODC image

Map produced using the GEBCO Digital Atlas.

The triangles indicate the nominal positions of each standard L station on Shelf Edge Line L. The square is the nominal position of Ellett Line station R, which is incorporated into Shelf Edge Line L.

Nominal station details

DML Shelf Edge Line L Stations

Station Nominal latitude Nominal longitude Approx.
depth (m)
L1 56° 42.0' N 09° 48.0' W 1820
L2 * 56° 45.0' N 09° 40.0' W  
L3 56° 48.0' N 09° 32.0' W 1720
L4 56° 51.0' N 09° 24.0' W  
L5 56° 54.0' N 09° 16.0' W 1286
L6 56° 55.5' N 09° 12.0' W 960
L7 56° 57.0' N 09° 08.0' W 343
L8 56° 58.5' N 09° 04.0' W 145
R 57° 00.0' N 09° 00.0' W 135
L9 57° 02.5' N 08° 52.5' W 125
L10 57° 05.0' N 08° 45.0' W 123

* One off station

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
B nominal value
Q value below limit of quantification

Appendix 1: DML Shelf Edge Line L Station L8

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
385896CTD or STD cast1993-05-19 20:33:0056.975 N, 9.0633 WRRS Challenger CH103
391392CTD or STD cast1994-08-23 22:18:0056.975 N, 9.0667 WRRS Challenger CH114

Appendix 2: DML Shelf Edge Line L

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
385767CTD or STD cast1993-05-17 10:04:0057.0 N, 9.0 WRRS Challenger CH103
385847CTD or STD cast1993-05-19 06:45:0056.6967 N, 9.7983 WRRS Challenger CH103
385859CTD or STD cast1993-05-19 08:43:0056.8 N, 9.53 WRRS Challenger CH103
385860CTD or STD cast1993-05-19 16:46:0056.8967 N, 9.2433 WRRS Challenger CH103
385872CTD or STD cast1993-05-19 17:34:0056.925 N, 9.2117 WRRS Challenger CH103
385884CTD or STD cast1993-05-19 19:34:0056.9467 N, 9.125 WRRS Challenger CH103
385896CTD or STD cast1993-05-19 20:33:0056.975 N, 9.0633 WRRS Challenger CH103
385903CTD or STD cast1993-05-19 21:39:0056.9967 N, 9.0017 WRRS Challenger CH103
385915CTD or STD cast1993-05-19 22:35:0057.0433 N, 8.8733 WRRS Challenger CH103
385927CTD or STD cast1993-05-20 00:26:0057.0833 N, 8.75 WRRS Challenger CH103
390014CTD or STD cast1994-05-11 23:34:0056.8333 N, 9.4167 WRRS Challenger CH112
391275CTD or STD cast1994-08-23 08:30:0056.7 N, 9.8 WRRS Challenger CH114
391287CTD or STD cast1994-08-23 10:07:0056.75 N, 9.6667 WRRS Challenger CH114
391299CTD or STD cast1994-08-23 11:13:0056.7928 N, 9.5333 WRRS Challenger CH114
391306CTD or STD cast1994-08-23 12:20:0056.85 N, 9.3932 WRRS Challenger CH114
391331CTD or STD cast1994-08-23 19:04:0056.9 N, 9.2667 WRRS Challenger CH114
391355CTD or STD cast1994-08-23 20:06:0056.925 N, 9.2 WRRS Challenger CH114
391379CTD or STD cast1994-08-23 21:12:0056.95 N, 9.1333 WRRS Challenger CH114
391380CTD or STD cast1994-08-23 21:48:0056.9633 N, 9.1333 WRRS Challenger CH114
391392CTD or STD cast1994-08-23 22:18:0056.975 N, 9.0667 WRRS Challenger CH114
391423CTD or STD cast1994-08-23 23:18:0057.0 N, 9.0 WRRS Challenger CH114
391435CTD or STD cast1994-08-24 00:14:0057.0382 N, 8.8717 WRRS Challenger CH114
391447CTD or STD cast1994-08-24 01:12:0057.0765 N, 8.7508 WRRS Challenger CH114