Metadata Report for BODC Series Reference Number 559425
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Public domain 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.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
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.
RV Scotia 7/2000 CTD Data Documentation
Introduction
Documentation for data collected on R.V. Scotia cruise 7/2000 (8 May - 22 May 2000) by Fisheries Research Services, Aberdeen, UK.
Instrumentation and Protocols
The temperature and salinity data were collected using a SeaBird SBE9/11+ instrument which was calibrated using bottle samples and thermometer readings to produce the following equations:
T(cal) = T(obs)
C(cal) = 1.000276C(obs) + 0.011413
For further information, contact
George Slesser
Ocean Climate Group
FRS, Marine Laboratory Aberdeen
PO Box 101
Victoria Road
Aberdeen AB11 9DB
G.Slesser@marlab.ac.uk
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
Cruise Name | 0700S |
Departure Date | 2000-05-08 |
Arrival Date | 2000-05-22 |
Principal Scientist(s) | Bill Turrell (Fisheries Research Services Aberdeen Marine Laboratory) |
Ship | FRV Scotia |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | East of Shetland Line 1 |
Category | Offshore route/traverse |
East of Shetland Line 1
The East of Shetland Line 1 consists of a line of sample stations east of Shetland to the centre of the North Sea.
At present the Fisheries Research Services (FRS) monitors this line.
These data provide information on long term variations in key variables.
Monitoring data include: Ocean profiles of temperature, salinity and nutrients.
Related Fixed Station activities are detailed in Appendix 1
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: East of Shetland Line 1
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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
559413 | CTD or STD cast | 2000-05-21 05:32:00 | 60.165 N, 0.9933 W | FRV Scotia 0700S |
559437 | CTD or STD cast | 2000-05-21 07:02:00 | 60.1633 N, 0.665 W | FRV Scotia 0700S |
559449 | CTD or STD cast | 2000-05-21 07:46:00 | 60.165 N, 0.4983 W | FRV Scotia 0700S |
559450 | CTD or STD cast | 2000-05-21 08:42:00 | 60.165 N, 0.3283 W | FRV Scotia 0700S |
559462 | CTD or STD cast | 2000-05-21 09:20:00 | 60.1633 N, 0.1683 W | FRV Scotia 0700S |
559474 | CTD or STD cast | 2000-05-21 10:01:00 | 60.165 N, 0.0 W | FRV Scotia 0700S |
559486 | CTD or STD cast | 2000-05-21 10:43:00 | 60.165 N, 0.1683 E | FRV Scotia 0700S |
726410 | CTD or STD cast | 2006-10-08 13:53:00 | 60.00017 N, 2.0015 E | FRV Scotia 1506S |
726422 | CTD or STD cast | 2006-10-08 15:07:00 | 59.9995 N, 1.6695 E | FRV Scotia 1506S |
726434 | CTD or STD cast | 2006-10-08 16:45:00 | 59.999 N, 1.33017 E | FRV Scotia 1506S |
726446 | CTD or STD cast | 2006-10-08 17:57:00 | 59.99967 N, 1.00383 E | FRV Scotia 1506S |
726458 | CTD or STD cast | 2006-10-08 19:19:00 | 60.00017 N, 0.66983 E | FRV Scotia 1506S |
726471 | CTD or STD cast | 2006-10-08 20:35:00 | 59.99933 N, 0.3365 E | FRV Scotia 1506S |
726483 | CTD or STD cast | 2006-10-08 21:49:00 | 59.99883 N, 0.002 E | FRV Scotia 1506S |
726495 | CTD or STD cast | 2006-10-08 23:14:00 | 59.99967 N, 0.33333 W | FRV Scotia 1506S |
726502 | CTD or STD cast | 2006-10-09 00:01:00 | 59.99917 N, 0.49767 W | FRV Scotia 1506S |
726514 | CTD or STD cast | 2006-10-09 00:53:00 | 59.999 N, 0.667 W | FRV Scotia 1506S |
726526 | CTD or STD cast | 2006-10-09 01:45:00 | 59.9995 N, 0.83383 W | FRV Scotia 1506S |
726538 | CTD or STD cast | 2006-10-09 02:34:00 | 59.99967 N, 1.00017 W | FRV Scotia 1506S |
1035010 | CTD or STD cast | 2009-05-24 17:08:00 | 60.0 N, 6.7E-4 W | FRV Scotia 0709S |
1035022 | CTD or STD cast | 2009-05-24 18:28:00 | 59.99983 N, 0.3325 W | FRV Scotia 0709S |
1035034 | CTD or STD cast | 2009-05-24 19:23:00 | 60.00017 N, 0.49833 W | FRV Scotia 0709S |
1035046 | CTD or STD cast | 2009-05-24 20:14:00 | 59.99983 N, 0.66533 W | FRV Scotia 0709S |
1035058 | CTD or STD cast | 2009-05-24 21:05:00 | 60.0 N, 0.83267 W | FRV Scotia 0709S |
1035071 | CTD or STD cast | 2009-05-24 21:56:00 | 60.0 N, 0.9995 W | FRV Scotia 0709S |
1036001 | CTD or STD cast | 2009-10-03 01:25:00 | 59.99767 N, 0.99917 W | FRV Scotia 1309S |
1036013 | CTD or STD cast | 2009-10-03 02:15:00 | 59.99783 N, 0.81867 W | FRV Scotia 1309S |
1036025 | CTD or STD cast | 2009-10-03 03:04:00 | 59.99967 N, 0.66683 W | FRV Scotia 1309S |
1036037 | CTD or STD cast | 2009-10-03 03:58:00 | 59.999 N, 0.498 W | FRV Scotia 1309S |
1036049 | CTD or STD cast | 2009-10-03 04:49:00 | 59.99817 N, 0.33517 W | FRV Scotia 1309S |
1036050 | CTD or STD cast | 2009-10-03 06:07:00 | 59.997 N, 0.001 E | FRV Scotia 1309S |
1036062 | CTD or STD cast | 2009-10-03 07:23:00 | 59.99917 N, 0.33667 E | FRV Scotia 1309S |
1036074 | CTD or STD cast | 2009-10-03 08:40:00 | 59.99833 N, 0.66917 E | FRV Scotia 1309S |
1036086 | CTD or STD cast | 2009-10-03 09:58:00 | 59.998 N, 0.999 E | FRV Scotia 1309S |
1036098 | CTD or STD cast | 2009-10-03 11:16:00 | 59.998 N, 1.33417 E | FRV Scotia 1309S |
1036105 | CTD or STD cast | 2009-10-03 12:34:00 | 59.99933 N, 1.66333 E | FRV Scotia 1309S |