Metadata Report for BODC Series Reference Number 616186

Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
Sea-Bird SBE 13 Dissolved Oxygen Sensor  dissolved gas sensors
Sea-Bird SBE 911plus CTD  CTD; water temperature sensor; salinity sensor
SeaTech S131 fluorometer  fluorometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Bill Turrell
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Project(s) -

Data Identifiers

Originator's Identifier CZ02/02/29
BODC Series Reference 616186

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-05-18 22:27
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars

Spatial Co-ordinates

Latitude 61.81770 N ( 61° 49.1' N )
Longitude 5.34550 W ( 5° 20.7' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 0.99 m
Maximum Sensor Depth 156.43 m
Minimum Sensor Height 26.56 m
Maximum Sensor Height 182.01 m
Sea Floor Depth 183.0 m
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor 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


BODC CODE Rank Units Short Title Title
CNDCST01 1 Siemens per metre CTDCond Electrical conductivity of the water body by CTD
CPHLPR01 1 Milligrams per cubic metre chl-a_water_ISfluor Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by in-situ chlorophyll fluorometer
DOXYPR01 1 Micromoles per litre WC_dissO2_Beck Concentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ Beckmann probe
FVLTWS01 1 Volts WsVolt Voltage of instrument output by linear-response chlorophyll fluorometer
PRESPR01 1 Decibars Pres_Z Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALST01 1 Dimensionless P_sal_CTD Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
SIGTEQ01 1 Kilograms per cubic metre SigmaTheta Sigma-theta of the water body by computation from salinity and potential temperature using UNESCO algorithm
TEMPST01 1 Degrees Celsius WC_temp_CTD Temperature 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

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 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.


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 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 .

SeaTech fluorometer S131

This fluorometer is designed to measure in situ chlorophyll- a fluorescence and provide high resolution data for assessment of phytoplankton biomass and monitoring of primary productivity in fresh or marine waters. It's versatility allows the instrument to be deployed on a mooring or in profiling mode. It is not sensitive to ambient light, permitting laboratory calibration with normal room lighting, and field measurements to be made at the water surface.


Nominal Chl- a ranges 3, 10, 30, 100, 300 and 1000 µg L -1
Time constant 0.1, 1.0, 3.0 and 10 s
Maximum depth 3000 m
Excitation filter

425 nm peak

200 nm FWHM *

Emission filter

685 nm peak

30 nm FWHM

*FWHM- Full-Width Half-Maximum

Further details can be found in the manufacturer's manual .

RV Cirolana 23/2002 CTD Data Documentation


The instrument used for casts 1-19, 24-30 and 35-66 was a Sea-Bird SBE911 plus.

Details of the sensors on the CTD are -

Manufacturer Sensor Serial No. Manufacturer Cal. Date Sensor Units
Sea-Bird Pressure 64240 26 Oct 2000 Decibars
Sea-Bird Temperature 2041 19 Oct 2000 Centigrade
Sea-Bird Conductivity 1615 19 Oct 2000 Siemens/meter
Sea-Bird Oxygen 130411 28 Feb 1996 cm 3 /dm 3
Sea-Tech Fluorometer 131S 01 Apr 1998 Volts
Sea-Tech Transmissometer 238D 02 Aug 1996 Volts

The instrument used for casts 20-23 and 31-34 was a Sea-Bird SBE25 Sealogger.

Details of the sensors on the CTD are -

Manufacturer Sensor Serial No. Manufacturer Cal. Date Sensor Units
Sea-Bird Pressure 051128 13 May 2000 Decibars
Sea-Bird Temperature 1696 13 May 2000 Centigrade
Sea-Bird Conductivity 1454 13 May 2000 Siemens/meter
Sea-Tech Fluorometer 131S 01 Apr 1998 Volts
Sea-Tech Transmissometer 238D 02 Aug 1996 Volts


The calibrations for casts 1-19, 24-30 and 35-66 were as follows:

Parameter Value of m (y=mx+c) Value of c (y=mx+c) Equation
Pressure 1.000000 0.000000 P(cal) = P(obs)
Temperature 1.000000 0.000000 T(cal) = T(obs)
Conductivity 1.000169 -0.002970 C(cal) = 1.000169C(obs) + -0.002970
Oxygen 1.000000 0.000000 O(cal) = O(obs)
Oxygen Saturation 1.000000 0.000000 OS(cal) = Os(obs)
Fluorescence 0.000244 0.065469 Chlor.(cal)(ug/l) = 0.000244F(obs)(V) + 0.065469
Beam Attenuation 1.000000 0.000000 B(cal) = B(obs)

The calibrations for casts 20-23 and 31-34 were as follows:

Parameter Value of m (y=mx+c) Value of c (y=mx+c) Equation
Pressure 1.000000 0.000000 P(cal) = P(obs)
Temperature 1.000000 0.000000 T(cal) = T(obs)
Conductivity 0.999239 0.035327 C(cal) = 0.999239C(obs) + 0.035327
Fluorescence 0.000244 0.065469 Chlor.(cal)(ug/l) = 0.000244F(obs)(V) + 0.065469
Beam Attenuation 1.000000 0.000000 B(cal) = B(obs)

Data Quality Information

These data appear to be good.

General Data Screening carried out by BODC

BODC screen both the series header qualifying information and the parameter values in the data cycles themselves.

Header information is inspected for:

Documents are written by BODC highlighting irregularities which cannot be resolved.

Data cycles are inspected using time or depth series plots of all parameters. Currents are additionally inspected using vector scatter plots and time series plots of North and East velocity components. These presentations undergo intrinsic and extrinsic screening to detect infeasible values within the data cycles themselves and inconsistencies as seen when comparing characteristics of adjacent data sets displaced with respect to depth, position or time. Values suspected of being of non-oceanographic origin may be tagged with the BODC flag denoting suspect value; the data values will not be altered.

The following types of irregularity, each relying on visual detection in the plot, are amongst those which may be flagged as suspect:

If a large percentage of the data is affected by irregularities then a Problem Report will be written rather than flagging the individual suspect values. Problem Reports are also used to highlight irregularities seen in the graphical data presentations.

Inconsistencies between the characteristics of the data set and those of its neighbours are sought and, where necessary, documented. This covers inconsistencies such as the following:

This intrinsic and extrinsic screening of the parameter values seeks to confirm the qualifying information and the source laboratory's comments on the series. In screening and collating information, every care is taken to ensure that errors of BODC making are not introduced.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information


Cruise Name 2302H (CIR2Y/02)
Departure Date 2002-05-15
Arrival Date 2002-05-28
Principal Scientist(s)Bill Turrell (Fisheries Research Services Aberdeen Marine Laboratory)
Ship RV Cirolana

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameNolso - Flugga Line
CategoryOffshore route/traverse

Nolso-Flugga - Faroe-Shetland Channel section

Long term monitoring carried out by the Marine Laboratory Aberdeen began in the early 1890's by the forerunner of the laboratory, the Fishery Board of Scotland (est. 1882). The first water bottle casts were carried out during 1893 and conducted by Dr H N Dickson on board HMS Jackal. Four of these stations were to become part of the now standard Nolso-Flugga Faroe-Shetland Channel section. In addition, at positions further south, he sampled at three stations and these were to become part of the standard Fair Isle-Munken section. A full set of stations (12) were first sampled along the Nolso-Flugga line in 1903, and since then have more or less been sampled annually or more except for the war years. Since then extra stations have been added to both sections.

Map of standard stations

BODC image

Nolso-Flugga stations

Listed below are details of the standard hydrographic stations that form the Nolso-Flugga line.

Station number Station name Latitude Longitude Depth Spacing
01 NOL-01 60° 56.00' N 01° 00.00' W 110 m -
02 SEFOS 60° 58.70'N 01° 17.70' W 125 m 9.00 nm
03 SEFOS 61° 01.40' N 01° 35.40' W 155 m 8.98 nm
04 NOL-02 61° 04.00' N 01° 53.00' W 270 m 8.90 nm
05 SEFOS 61° 06.00' N 02° 01.50' W 440 m 4.56 nm
06 NOL-03 61° 08.00' N 02° 10.00' W 550 m 4.56 nm
07 SEFOS 61° 09.30' N 02° 17.50' W 630 m 3.84 nm
08 NOL-3a 61° 11.00' N 02° 25.00' W 730 m 3.99 nm
09 NOL-04 61° 14.00' N 02° 40.00' W 1080 m 7.81 nm
10 NOL-05 61° 21.00' N 03° 10.00' W 1370 m 16.00 nm
11 NOL-06 61° 28.00' N 03° 42.00' W 1235 m 16.82 nm
12 NOL-07 61° 35.00' N 04° 15.00' W 990 m 17.20 nm
13 NOL-08 61° 42.00' N 04° 51.00' W 235 m 18.45 nm
14 NOL-09 61° 49.00' N 05° 21.00' W 180 m 15.81 nm
15 NOL-10 61° 54.00' N 05° 45.00' W 290 m 12.36 nm
16 NOL-11 62° 00.00' N 06° 12.00' W 125 m 14.02 nm

Standard depths of water bottles:

5, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200. If all 12 bottles used drop 50m, 200m and 400m depths in this order

Other Series linked to this Fixed Station for this cruise - 616162 616174 616198 616205 616217 616229 616230 616242 616254 616266 616278

Other Cruises linked to this Fixed Station (with the number of series) - 0195S (9) 0512S (16) 0700S (16) 0703S (16) 0705S_1 (16) 0706S (16) 0709S (16) 1309S (16) 1312S (19) 1395S (13) 1402S (16) 1403S (16) 1405S (16) 1506S (16) 1609S (12) 1695S (10) 1712S (16) 1802S (16) 1803S (11) 1805S (7) 1906S (14)

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