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Metadata Report for BODC Series Reference Number 1886252


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Sea-Bird SBE 43 Dissolved Oxygen Sensor  dissolved gas sensors
Chelsea Technologies Group Aquatracka fluorometer  fluorometers
Sea-Bird SBE 911plus CTD  CTD; water temperature sensor; salinity sensor
WETLabs ECO FL fluorometer  fluorometers
WETLabs ECO-FLNTU combined fluorometer and turbidity sensor  fluorometers; optical backscatter sensors
Sea-Bird SBE 3plus (SBE 3P) temperature sensor  water temperature sensor
Sea-Bird SBE 4C conductivity sensor  salinity sensor
Paroscientific Digiquartz depth sensors  water pressure sensors
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Ms Jenny Hindson
Originating Organization Marine Scotland Aberdeen Marine Laboratory
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier SC18/15/456
BODC Series Reference 1886252
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-12-10 14:07
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars
 

Spatial Co-ordinates

Latitude 57.49517 N ( 57° 29.7' N )
Longitude 1.36433 W ( 1° 21.9' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 1.98 m
Maximum Sensor or Sampling Depth 96.08 m
Minimum Sensor or Sampling Height 11.92 m
Maximum Sensor or Sampling Height 106.02 m
Sea Floor Depth 108.0 m
Sea Floor Depth Source DATAHEAD
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 Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
ACYCAA011DimensionlessSequence number
CCOMD0011Parts per billionConcentration of coloured dissolved organic matter {CDOM Gelbstoff} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ UV Aquatracka fluorometer
CCOMD0021Parts per billionConcentration of coloured dissolved organic matter {CDOM Gelbstoff} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ WET Labs FDOM ECO fluorometer
CNDCST011Siemens per metreElectrical conductivity of the water body by CTD
CPHLPR011Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by in-situ chlorophyll fluorometer
CPHLZZXX1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase]
DOXYZZ011Micromoles per litreConcentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ sensor
OXYSSU011PercentSaturation of oxygen {O2 CAS 7782-44-7} in the water body [dissolved plus reactive particulate phase] by Sea-Bird SBE 43 sensor and computation from concentration using Benson and Krause algorithm
POTMCV011Degrees CelsiusPotential temperature of the water body by computation using UNESCO 1983 algorithm
PRESPR011DecibarsPressure (spatial coordinate) exerted by the water body by profiling pressure sensor and correction to read zero at sea level
PSALST011DimensionlessPractical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
SIGTPR011Kilograms per cubic metreSigma-theta of the water body by CTD and computation from salinity and potential temperature using UNESCO algorithm
TEMPST011Degrees CelsiusTemperature of the water body by CTD or STD
TURBXXXX1Nephelometric Turbidity UnitsTurbidity of water in the water body

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 quality report for CTD data from FRV Scotia cruises 0515S, 1315S and 1815S

During BODC quality control, data were screened using in house visualisation software. The data were screened and any obvious outliers and spikes were looked at in closer detail and flagged if necessary. The originator provided quality flags for all data and so minimal flags were added during BODC processing as data had already been through originator QC. The originator's flags were converted to 'L' flags during processing.

There were a number of profiles where CPHLZZXX and CPHLPR01 are negative for the duration of the cast and so the whole of these casts have been flagged 'M'.

CCOMD002

The first cycle of the series 1886252 has the value -95.292503 ppb which was flagged by the originator. During BODC processing this value was set to null.


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

Sea-Bird Dissolved Oxygen Sensor SBE 43 and SBE 43F

The SBE 43 is a dissolved oxygen sensor designed for marine applications. It incorporates a high-performance Clark polarographic membrane with a pump that continuously plumbs water through it, preventing algal growth and the development of anoxic conditions when the sensor is taking measurements.

Two configurations are available: SBE 43 produces a voltage output and can be incorporated with any Sea-Bird CTD that accepts input from a 0-5 volt auxiliary sensor, while the SBE 43F produces a frequency output and can be integrated with an SBE 52-MP (Moored Profiler CTD) or used for OEM applications. The specifications below are common to both.

Specifications

Housing Plastic or titanium
Membrane

0.5 mil- fast response, typical for profile applications

1 mil- slower response, typical for moored applications

Depth rating

600 m (plastic) or 7000 m (titanium)

10500 m titanium housing available on request

Measurement range 120% of surface saturation
Initial accuracy 2% of saturation
Typical stability 0.5% per 1000 h

Further details can be found in the manufacturer's specification sheet.

CTD data from FRV Scotia cruises 0215S, 0315S, 0515S, 0815S, 1015S, 1115S, 1315S, 1415S, 1715S and 1815S: Instrumentation

Cruise Manufacturer Model Sensor Serial Number
0215S, 0315S, 0815S Sea-Bird SBE 19plus V2 SEACAT CTD 6028
WETLabs ECO-FLNTU Combined fluorometer and turbidity sensor 0942
1015S, 1115S, 1415S, 1715S Sea-Bird SBE 19plus V2 SEACAT CTD 6029
WETLabs ECO-FLNTU Combined fluorometer and turbidity sensor 0947
0515S, 1315S, 1815S Sea-Bird SBE 911plus CTD
Paroscientific Digiquartz Depth sensors Pressure 64240
Sea-Bird SBE 3plus Temperature 2041
Sea-Bird SBE 4C Conductivity 1615
Sea-Bird SBE 43 Dissolved Oxygen 0504
WETLabs ECO-FLNTU Combined fluorometer and turbidity sensor 2542
Chelsea Technologies Group UV Aquatracka Fluorometer 9644
WETLabs ECO FL Fluorometer 3700

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.

Aquatracka fluorometer

The Chelsea Instruments Aquatracka is a logarithmic response fluorometer. It uses a pulsed (5.5 Hz) xenon light source discharging between 320 and 800 nm through a blue filter with a peak transmission of 420 nm and a bandwidth at half maximum of 100 nm. A red filter with sharp cut off, 10% transmission at 664 nm and 678 nm, is used to pass chlorophyll-a fluorescence to the sample photodiode.

The instrument may be deployed either in a through-flow tank, on a CTD frame or moored with a data logging package.

Further details can be found in the manufacturer's specification sheet.

WETLabs ECO FLNTU fluorescence and turbidity sensor

The Environmental Characterization Optics (ECO) Fluorometer and Turbidity (FLNTU) sensor is a dual wavelength, single-angle instrument that simultaneously determines chlorophyll fluorescence and turbidity. It is easily integrated in CTD packages and provides a reliable turbidity measurement that is not affected by Colored Dissolved Organic Matter (CDOM) concentration.

The FLNTU can operate continuously or periodically and has two different types of connectors to output the data. There are 5 other models that operate the same way as this instrument but have slight differences, as stated below:

  • FLNTU(RT) - has an analog an RS-232 serial output and operates continuously, when power is supplied
  • FLNTU(RT)D - similar to the FLNTU(RT) but has a depth rating of 6000 m
  • FLNTUB - has internal batteries for autonomous operation
  • FLNTUS - has an integrated anti-fouling bio-wiper
  • FLNTUSB - has the same characteristics as the FLNTUS but with internal batteries for autonomous operation

Specifications

Temperature range 0 to 30°C
Depth rating

600 m (standard)

6000 m (deep)

Turbidity
Wavelength 700 nm
Sensitivity 0.01 NTU
Typical range 0.01 to 25 NTU
Fluorescence
Wavelength 470 nm (excitation), 695 nm (emission)
Sensitivity 0.01 µg L-1
Typical range 0.01 to 50 µg L-1
Linearity 99% R2

Further details can be found in the manufacturer's specification sheet.

WETLabs ECO-FL Fluorometer

The Environmental Characterization Optics series of single channel fluorometers are designed to measure concentrations of natural and synthetic substances in water, and are therefore useful for biological monitoring and dye trace studies. Selected excitation and emission filters allow detection of the following substances: chlorophyll-a, coloured dissolved organic matter (CDOM), uranine (fluorescein), rhodamine, phycoerythrin and phycocyanin.

The ECO-FL can operate continuously or periodically and has two different types of connectors to output the data (analogue and RS-232 serial output). The potted optics block results in long term stability of the instrument and the optional anti-biofouling technology delivers truly long term field measurements.

In addition to the standard model, five variants are available, and the differences between these and the basic ECO-FL are listed below:

  • FL(RT): similar to the FL but operates continuously when power is supplied
  • FL(RT)D: similar model to the (RT) but has a depth rating of 6000 m
  • FLB: includes internal batteries for autonomous operation and periodic sampling
  • FLS: similar to FLB but has an integrated anti-fouling bio-wiper
  • FLSB: similar to the FLS, but includes internal batteries for autonomous operation

Specifications

Temperature range 0 to 30°C
Depth rating

600 m (standard)

6000 m (deep)

Linearity 99 % R2
Chlorophyll-a
Wavelength (excitation/emission) 470/695 nm
Sensitivity 0.01 µg L-1
Typical range 0.01 to 125 µg L-1
CDOM
Wavelength (excitation/emission) 370/460 nm
Sensitivity 0.01 ppb
Typical range 0.09 to 500 ppb
Uranine
Wavelength (excitation/emission) 470/530 nm
Sensitivity 0.07 ppb
Typical range 0.12 to 230 ppb
Rhodamine
Wavelength (excitation/emission) 540/570 nm
Sensitivity 0.01 ppb
Typical range 0.01 to 230 ppb
Phycoerythrin
Wavelength (excitation/emission) 540/570 nm
Sensitivity 0.01 ppb
Typical range 0.01 to 230 ppb
Phycocyanin
Wavelength (excitation/emission) 630/680 nm
Sensitivity 0.15 ppt
Typical range 0.15 to 400 ppt

Further details can be found in the manufacturer's specification sheet.

BODC Processing of CTD data from FRV Scotia cruises 0215S, 0315S, 0515S, 0815S, 1015S, 1115S, 1315S, 1415S, 1715S and 1815S.

Data Processing

Data were submitted to BODC as 10 ASCII files by SFT and following BODC procedures the data were archived. The files contained all CTD casts from each of the following FRV Scotia cruises: 0215S (49 casts), 0315S (47 casts), 0515S (57 casts), 0815S (32 casts), 1015S (65 casts), 1115S (20 casts), 1315S (125 casts), 1415S (6 casts), 1715S (40 casts) and 1815S (108 casts). The data from cruises 0515S, 1315S and 1815S were also accompanied by a file of quality control flags. The header of each file contained the type of CTD used for each cruise, the sensors on the CTD and their serial numbers, an explanation of the format of the file and details of any calibrations.

The concatenated files were sub-divided into individual files for each cast using in house BODC Matlab software. The divided files were then transferred to BODC internal format using standard BODC processing procedures. The originator's variables were mapped to BODC parameter codes as follows:

Originator's Variable Units BODC Parameter Code Units Comment
Pressure dbar PRESPR01 dbar
Temperature (edit) °C TEMPST01 °C This channel has had QC applied by the originator.
Conductivity (edit) mS cm-1 CNDCST01 S m-1 Conversion of /10 applied. This channel has had QC applied by the originator.
Temperature (pri) °C TEMPST01 °C Channel not transferred. The edited channel has been through originator's editing procedures and is of a better quality.
Conductivity (pri) mS cm-1 CNDCST01 S cm-1 Channel not transferred. The edited channel has been through originator's editing procedures and is of a better quality.
Temperature (sec) °C TEMPST02 °C Channel not transferred. The edited channel has been through originator's editing procedures and is of a better quality.
Conductivity (sec) mS cm-1 CNDCST02 S cm-1 Channel not transferred. The edited channel has been through originator's editing procedures and is of a better quality.
Fluorescence μg L-1 CPHLPR01 mg m-3 Equivalent units
Turbidity NTU TURBXXXX NTU
Oxygen mL L-1 DOXYZZ01 μmol L-1 Conversion of * 44.66 applied. Series from cruises 0515S, 1315S and 1815S only.
Fluorescence CDOM-AQ μg L-1 CCOMD001 mg m-3 Series from cruises 0515S, 1315S and 1815S only.
Fluorescence CDOM-WL μg L-1 CCOMD002 mg m-3 Series from cruises 1315S and 1815S only.
PSALST01 dimensionless Channel derived during transfer using Fofonoff and Millard (1983).
SIGTPR01 kg m-3 Channel derived during transfer using Fofonoff and Millard (1983).
OXYSSU01 % Channel derived during transfer using Benson and Krause (1984) if oxygen channel is present.

Channels that were not transferred are available on request.

Screening

Post transfer analysis and crosschecks were applied according to BODC procedures. This involved the screening of data using BODC's in house visualisation software where any suspect data were flagged but not removed.

References

Benson B.B. and Krause D., 1984. The concentration and isotopic fractionation of oxygen dissolved in freshwater and seawater in equilibrium with the atmosphere. Limnol. Oceanogr., 29(3), 620-632.

Fofonoff N.P. and Millard R.C., 1983. Algorithms for computations of fundamental properties of seawater. UNESCO Technical Papers in Marine Science No. 44, 53pp.

Originator Processing of CTD data from FRV Scotia cruises 0215S, 0315S, 0515S, 0815S, 1015S, 1115S, 1315S, 1415S, 1715S and 1815S.

Sampling Strategy

During 2015 a number of cruises occurred on the FRV Scotia were objectives covered trawl sampling, fish sampling and hydrographic sampling. As part of the hydrographic sampling numerous CTD casts were completed on each cruise. The time channel of these casts was recorded in GMT.

Cruise Cruise Dates Number of CTD Casts
0215S 23 JAN 2015 - 13 FEB 2015 49
0315S 16 FEB 2015 - 09 MAR 2015 47
0515S 25 APR 2015 - 8 MAY 2015 57
0815S 25 JUN 2015 - 14 JUL 2015 32
1015S 30 JUL 2015 - 20 AUG 2015 65
1115S 23 AUG 2015 - 3 SEPT 2015 20
1315S 19 SEPT 2015 - 02 OCT 2015 125
1415S 5 OCT 2015 - 16 OCT 2015 6
1715S 18 NOV 2015 - 8 DEC 2015 40
1815S 10 DEC 2015 -23 DEC 2015 108

Data Processing

The CTD data were processed by Marine Scotland using the Sea-Bird SeaSoft routines as recommended in the SeaSoft manual for model type Sea-Bird SBE19plus V2 SEACAT.

Pressure data were binned to 1 dbar using SeaSoft and the primary temperature and conductivity channels were adjusted to produce 'edit' channels. Marine Scotland regards the 'edit' channels as the definitive version of the data.

The adjustments consisted of a de-spiking process using Marine Scotland in-house visualisation software and, as necessary, application of a low pass filter as described in Sy (1985).

Field Calibrations

For a number of the cruises Marine Scotland used water samples collected during the CTD casts to generate a calibration equations for the conductivity and fluorescence channels. However, these calibrations were not applied to the data by the originator.

Conductivity

Cruise Number of samples used in calibration Calibration Equation
0215S 98 Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000403 - 0.008508
0315S 94 Calibrated Conductivity (mS cm-1) = measured conductivity x 1.0012 - 0.0397
0515S 324 Calibrated Conductivity (mS cm-1) = measured conductivity x 0.99909 + 0.034932
0815S 51 Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000135 + 0.004973
1015S 108 Calibrated Conductivity (mS cm-1) = measured conductivity x 0.998795 + 0.051757
1115S 39 Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000269 - 0.006588
1315S 280 Calibrated Conductivity (mS cm-1) = measured conductivity x 0.99924 + 0.025999
1415S 9 Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999563 + 0.017777
1715S 73 Calibrated Conductivity (mS cm-1) = measured conductivity x 1.002776 - 0.101829
1815S 274 Calibrated Conductivity (mS cm-1) = measured conductivity x 1 - 0.00065

Fluorescence

Cruise Number of samples used in calibration Calibration Equation
0515S 101 Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000889 + 0.034492
1315S 102 Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000261 + 0.3669
1815S 107 Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.001304 - 0.067764

Reference

Sy A., 1985. An alternative editing technique for oceanographic data. Deep Sea Research, 32 (12), 1591-1599.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name 1815S
Departure Date 2015-12-10
Arrival Date 2015-12-22
Principal Scientist(s)Berit Rabe (Marine Scotland Aberdeen Marine Laboratory)
Ship FRV Scotia

Complete Cruise Metadata Report is available here


Fixed Station Information


No Fixed Station Information held for the Series


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