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Metadata Report for BODC Series Reference Number 2101718

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Niskin bottle  discrete water samplers
TitraLab TIM90, ABU91/ABU93 automated titration system  titrators
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Richard Abell
Originating Organization Scottish Association for Marine Science
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Oceans 2025 Theme 10 SO4

Data Identifiers

Originator's Identifier JC086_CTD_DOXY_3008:C008
BODC Series Reference 2101718

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2013-05-10 07:45
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 63.45278 N ( 63° 27.2' N )
Longitude 20.25583 W ( 20° 15.3' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 51.7 m
Maximum Sensor or Sampling Depth 195.8 m
Minimum Sensor or Sampling Height 12.2 m
Maximum Sensor or Sampling Height 156.3 m
Sea Floor Depth 208.0 m
Sea Floor Depth Source SCILOG
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -


BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
DOXYWITX1Micromoles per litreConcentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by Winkler titration
FIRSEQID1DimensionlessBottle firing sequence number
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number

Definition of BOTTFLAG

0The sampling event occurred without any incident being reported to BODC.
1The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material.
2Analytical evidence (e.g. surface water salinity measured on a sample collected at depth) indicates that the water sample has been contaminated by water from depths other than the depths of sampling.
3The feedback indicator on the deck unit reported that the bottle closure command had failed. General Oceanics deck units used on NERC vessels in the 80s and 90s were renowned for reporting misfires when the bottle had been closed. This flag is also suitable for when a trigger command is mistakenly sent to a bottle that has previously been fired.
4During the sampling deployment the bottle was fired in an order other than incrementing rosette position. Indicative of the potential for errors in the assignment of bottle firing depth, especially with General Oceanics rosettes.
5Water was reported to be escaping from the bottle as the rosette was being recovered.
6The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery.
7Either the bottle was found to contain no sample on recovery or there was no bottle fitted to the rosette position fired (but SBE35 record may exist).
8There is reason to doubt the accuracy of the sampling depth associated with the sample.
9The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage.

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

TitraLab TIM90, ABU91/ABU93 Automated Titration System

A modular, automated titration system for the laboratory. This includes a TIM90 titration manager, which can manage up to 3 burettes and store 40 methods; and either an ABU 91 Autoburette (one burette), or an ABU 93 Triburette (three burettes), both with 1 ml, 5 ml, 10 ml and 25 ml selectable quantities.

Niskin Bottle

The Niskin bottle is a device used by oceanographers to collect subsurface seawater samples. It is a plastic bottle with caps and rubber seals at each end and is deployed with the caps held open, allowing free-flushing of the bottle as it moves through the water column.

Standard Niskin

The standard version of the bottle includes a plastic-coated metal spring or elastic cord running through the interior of the bottle that joins the two caps, and the caps are held open against the spring by plastic lanyards. When the bottle reaches the desired depth the lanyards are released by a pressure-actuated switch, command signal or messenger weight and the caps are forced shut and sealed, trapping the seawater sample.

Lever Action Niskin

The Lever Action Niskin Bottle differs from the standard version, in that the caps are held open during deployment by externally mounted stainless steel springs rather than an internal spring or cord. Lever Action Niskins are recommended for applications where a completely clear sample chamber is critical or for use in deep cold water.

Clean Sampling

A modified version of the standard Niskin bottle has been developed for clean sampling. This is teflon-coated and uses a latex cord to close the caps rather than a metal spring. The clean version of the Levered Action Niskin bottle is also teflon-coated and uses epoxy covered springs in place of the stainless steel springs. These bottles are specifically designed to minimise metal contamination when sampling trace metals.


Bottles may be deployed singly clamped to a wire or in groups of up to 48 on a rosette. Standard bottles and Lever Action bottles have a capacity between 1.7 and 30 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

JC086 discrete dissolved oxygen sampling document

Originator's protocol for data acquisition and analysis

The following information contains extracts from the JC086 cruise report.

Water samples were collected immediately following recovery of the CTD using a silicon tube attached to the Niskin bottle spigot. The silicon tube was lowered into the bottom of a volume calibrated glass bottle and water from the Niskin bottle was allowed to overflow from the bottle until it had been flushed with approximately three times the volume required to fill it.

Discrete dissolved oxygen samples were taken to calibrate the CTD oxygen sensor and Niskin bottles were fired after reviewing the CTD profile.

SAMS Analysis

Samples were fixed immediately using 1ml of 3M MnSO4 and 1ml of 8M NaOH + 4M NaI and the temperature of fixing recorded using a digital thermometer in a separate sample bottle. Samples were fixed by adding 1 ml of manganese chloride followed by 1 ml of alkaline iodide with care being taken not to introduce any air bubbles to the solutions. An hour after collection samples were shaken and subsequent analysis occurred within six hours of this.

1 ml 3 M sulphuric acid was added to the sample, which was then stirred with a small magnetic stirrer on a Radiometer autotitrator until the precipitate was dissolved. Before every analytical session the titrant (0.3 M Na2S 2O3) was standardised using an in-house gravimetrically prepared 0.009M KIO3 standard. End points were recorded by the auto burette.

Triplicate oxygen samples were collected from up to 3-4 selected depths on 28 CTD casts deployed throughout the JC086 cruise. 278 samples in total were collected and analysed. 19 samples were either lost due to air being trapped within the bottle or being spoilt during analysis.

NOC Analysis

From each depth sampled, a duplicate was taken to allow a comparison of the values. Special care was taken at the time of sampling to not produce bubbles. Immediately after sampling, samples were spiked, first with 1 ml of manganous chloride 3M and secondly with 1 ml of alkaline iodide (sodium hydroxide (8M) and sodium iodide (4M). Samples were shaken straight after spiking and one hour after sampled to allow complete reaction of the chemicals with the dissolved oxygen.

Analysis was performed on board as soon as possible, following the Winkler titration method (Carpenter, 1965) and using a high precision 5ml automatic burette and a Titrino unit supplied by Metrohm.

BODC data processing procedures

The oxygen data were supplied to BODC in an MSTAR format. This file format was converted to ASCII and data were loaded into BODC's ocean database under the ORACLE Relational Database Management System without modification. Data that were considered unrealistic were flagged suspect. Metadata collected from the various data files were favoured by BODC over the metadata recorded in the cruise report logs in the JC086 cruise report.

Content of data series

Originator's Parameter Unit Description BODC Parameter code BODC Unit Comments
Dissolved oxygen µM Concentration of oxygen per unit volume of the water column by Winkler titration DOXYWITX µmol l-1 No unit conversion necessary

Data quality report

Flags in the Originators data file were converted to BODC flags.

References cited

Griffiths C. R. et al., (2013). RRS James Cook Cruise JC086, 06 May 2013 - 26 May 2013. Govan to Govan, Scotland - the Extended Ellett Line. Scottish Association for Marine Science. (Scottish Marine Institute, Oban).

Available - Cruise JC086 Internal Report

Project Information

Oceans 2025 Theme 10, Sustained Observation Activity 4: The Extended Ellett Line

The Ellett Line (begun in 1975 and since 1996 the Extended Ellett Line from Scotland to Iceland) crosses important north Atlantic Meridional Overturning Circulation (MOC) components and thus provides an additional contribution to understanding the north Atlantic response to climate change. Sustained Observation Activity (SO) 4 will repeat this section annually collecting a wide variety of physical and biogeochemical measurements, and will, to enhance the time variable component, make use of Argo floats and gliders. SO 4 will be implemented by physical, biological and chemical scientists at the National Oceanography Centre, Southampton (NOCS) and the Scottish Association for Marine Science (SAMS).

SO 4 formally contributes to the Department for Environment, Food and Rural Affairs (DEFRA)-funded Marine Environmental Change Network (MECN). Established in 2002 to coordinate and promote the collection and utilisation of marine time-series and long-term data sets, the goal of the network is to use long-term marine environmental data from around the British Isles and Ireland to separate natural fluctuations from global, regional and local anthropogenic impacts.

The specific deliverables for SO 4 are:

  • A time series of the evolution of the hydrography of the northeast Atlantic, together with a more formal understanding of the causes of any changes observed
  • An archived data set available to the international community via the British Oceanographic Data Centre (BODC)
  • A platform for further scientific research

More detailed information on this Work Package is available at pages 15 - 16 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2013-05-10
End Date (yyyy-mm-dd) 2013-05-10
Organization Undertaking ActivityScottish Association for Marine Science
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierJC086_CTD_C008
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for JC086_CTD_C008

Sample reference number Nominal collection volume(l) Bottle rosette position Bottle firing sequence number Minimum pressure sampled (dbar) Maximum pressure sampled (dbar) Depth of sampling point (m) Bottle type Sample quality flag Bottle reference Comments
943649   10.00 1 1  197.20  198.40  195.80 Niskin bottle No problem reported    
943652   10.00 2 2  197.30  197.80  195.60 Niskin bottle No problem reported    
943655   10.00 3 3  162.20  163.70  161.40 Niskin bottle No problem reported    
943658   10.00 4 4  162.20  163.00  160.90 Niskin bottle No problem reported    
943661   10.00 5 5  141.80  143.30  140.90 Niskin bottle No problem reported    
943664   10.00 6 6  142.00  143.20  141.10 Niskin bottle No problem reported    
943667   10.00 7 7  101.50  102.30  100.90 Niskin bottle No problem reported    
943670   10.00 8 8  101.70  102.00  100.80 Niskin bottle No problem reported    
943673   10.00 9 9   77.00   77.50   76.50 Niskin bottle No problem reported    
943676   10.00 10 10   76.50   77.70   76.50 Niskin bottle No problem reported    
943679   10.00 11 11   51.90   52.40   51.70 Niskin bottle No problem reported    
943682   10.00 12 12   51.80   52.90   51.90 Niskin bottle No problem reported    
943685   10.00 13 13   21.60   22.50   21.90 Niskin bottle No problem reported    
943688   10.00 14 14   21.30   22.60   21.70 Niskin bottle No problem reported    
943691   10.00 15 15   13.90   14.90   14.40 Niskin bottle No problem reported    
943694   10.00 16 16   14.10   14.90   14.20 Niskin bottle No problem reported    
943697   10.00 17 17    5.40    5.80    5.50 Niskin bottle No problem reported    
943700   10.00 18 18    5.30    5.80    5.50 Niskin bottle No problem reported    

Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.

Related Data Activity activities are detailed in Appendix 1


Cruise Name JC086
Departure Date 2013-05-06
Arrival Date 2013-05-26
Principal Scientist(s)Colin R Griffiths (Scottish Association for Marine Science)
Ship RRS James Cook

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
B nominal value
Q value below limit of quantification

Appendix 1: JC086_CTD_C008

Related series for this Data Activity 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
2098033Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2098487Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2099000Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2099583Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2100149Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2100703Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086
2101116Water sample data2013-05-10 07:45:3063.45278 N, 20.25583 WRRS James Cook JC086