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Metadata Report for BODC Series Reference Number 1896523

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Lever Action Niskin Bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Mark Stinchcombe
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Oceans 2025

Data Identifiers

Originator's Identifier D351_CTD_DOXY_257:CTD014t
BODC Series Reference 1896523

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-05-15 23:34
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 60.26013 N ( 60° 15.6' N )
Longitude 19.99731 W ( 19° 59.8' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 11.2 m
Maximum Sensor or Sampling Depth 2622.0 m
Minimum Sensor or Sampling Height 23.0 m
Maximum Sensor or Sampling Height 2633.8 m
Sea Floor Depth 2645.0 m
Sea Floor Depth Source PEVENT
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


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
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 supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."

Narrative Documents

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 have a capacity between 1.7 and 30 L, while Lever Action bottles have a capacity between 1.7 and 12 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

D351 measurements of dissolved oxygen from CTD bottles

Originator's Protocol for Sampling strategy and Analysis

The objective of the dissolved oxygen analysis was to provide a calibration data set for the oxygen sensor mounted on the frame of the CTD for cruise D351, the Extended Ellet line, to the Iceland Basin in the North Atlantic. For this, a Winkler titration with amperometric end point detection was performed on a number of water samples drawn from the Niskin bottles mounted on the CTD frame.

Dissolved oxygen samples were taken from both the Stainless Steel and the Titanium CTD. Oxygen samples were the first samples to be drawn from the Niskin bottles. The samples were drawn through short pieces of silicon tubing into clear, pre-calibrated, wide-necked glass bottles. The temperature of the water sample at the time of sampling was measured using an electronic thermometer probe. The temperature would be used to calculate any temperature dependent changes in the sample bottle volumes. Each of the samples was fixed immediately using 1ml of manganese chloride and 1ml of alkaline iodide. The samples were shaken thoroughly and left to settle for approximately thirty minutes before being shaken again. The samples were then left for at least an hour before analysis but all were analysed within twelve hours.

The samples were analysed in the chemistry laboratory following the procedure outlined in Holley and Hydes (1995). The samples were acidified using 1ml of sulphuric acid immediately before titration and stirred using a magnetic stirrer. The Winkler whole bottle titration method with amperometric endpoint detection with equipment supplied by Metrohm UK Ltd was used to determine the oxygen concentration.

Instrumentation Description

Stainless steel CTD: Seabird 9+ fitted with Seabird carousel type SBE32 and 24 x 20 L Niskin bottles.

Titanium CTD: Seabird 9+ CTD fitted with SBE 32 carousel and 24 x 10 L trace metal-free Niskin bottles.

BODC Data Processing Procedures

Data received were loaded into the BODC database using established BODC data banking procedures. The source file is the most recent and processed version of the data, according to the cruise report (p.56) and also confirmed by the data originator. It was uploaded to an sqlplus table which included the following headings:

  • OID

The originator's parameters are mapped to BODC parameters as below:

Originator's Parameter Unit Description BODC Parameter Code BODC Unit Comments
botoxy µmol/l Concentration of oxygen {O2} per unit volume of the water body [dissolved phase] by Winkler titration DOXYWITX Micromoles per litre None

Data Quality Report

No additional information on data quality supplied by originator.

Problem Report

No problems reported and no significant problems encountered during BODC data banking procedures.

Project Information

Oceans 2025 - The NERC Marine Centres' Strategic Research Programme 2007-2012

Who funds the programme?

The Natural Environment Research Council (NERC) funds the Oceans 2025 programme, which was originally planned in the context of NERC's 2002-2007 strategy and later realigned to NERC's subsequent strategy (Next Generation Science for Planet Earth; NERC 2007).

Who is involved in the programme?

The Oceans 2025 programme was designed by and is to be implemented through seven leading UK marine centres. The marine centres work together in coordination and are also supported by cooperation and input from government bodies, universities and other partners. The seven marine centres are:

  • National Oceanography Centre, Southampton (NOCS)
  • Plymouth Marine Laboratory (PML)
  • Marine Biological Association (MBA)
  • Sir Alister Hardy Foundation for Marine Science (SAHFOS)
  • Proudman Oceanographic Laboratory (POL)
  • Scottish Association for Marine Science (SAMS)
  • Sea Mammal Research Unit (SMRU)

Oceans2025 provides funding to three national marine facilities, which provide services to the wider UK marine community, in addition to the Oceans 2025 community. These facilities are:

  • British Oceanographic Data Centre (BODC), hosted at POL
  • Permanent Service for Mean Sea Level (PSMSL), hosted at POL
  • Culture Collection of Algae and Protozoa (CCAP), hosted at SAMS

The NERC-run Strategic Ocean Funding Initiative (SOFI) provides additional support to the programme by funding additional research projects and studentships that closely complement the Oceans 2025 programme, primarily through universities.

What is the programme about?

Oceans 2025 sets out to address some key challenges that face the UK as a result of a changing marine environment. The research funded through the programme sets out to increase understanding of the size, nature and impacts of these changes, with the aim to:

  • improve knowledge of how the seas behave, not just now but in the future;
  • help assess what that might mean for the Earth system and for society;
  • assist in developing sustainable solutions for the management of marine resources for future generations;
  • enhance the research capabilities and facilities available for UK marine science.

In order to address these aims there are nine science themes supported by the Oceans 2025 programme:

  • Climate, circulation and sea level (Theme 1)
  • Marine biogeochemical cycles (Theme 2)
  • Shelf and coastal processes (Theme 3)
  • Biodiversity and ecosystem functioning (Theme 4)
  • Continental margins and deep ocean (Theme 5)
  • Sustainable marine resources (Theme 6)
  • Technology development (Theme 8)
  • Next generation ocean prediction (Theme 9)
  • Integration of sustained observations in the marine environment (Theme 10)

In the original programme proposal there was a theme on health and human impacts (Theme 7). The elements of this Theme have subsequently been included in Themes 3 and 9.

When is the programme active?

The programme started in April 2007 with funding for 5 years.

Brief summary of the programme fieldwork/data

Programme fieldwork and data collection are to be achieved through:

  • physical, biological and chemical parameters sampling throughout the North and South Atlantic during collaborative research cruises aboard NERC's research vessels RRS Discovery, RRS James Cook and RRS James Clark Ross;
  • the Continuous Plankton Recorder being deployed by SAHFOS in the North Atlantic and North Pacific on 'ships of opportunity';
  • physical parameters measured and relayed in near real-time by fixed moorings and ARGO floats;
  • coastal and shelf sea observatory data (Liverpool Bay Coastal Observatory (LBCO) and Western Channel Observatory (WCO)) using the RV Prince Madog and RV Quest.

The data is to be fed into models for validation and future projections. Greater detail can be found in the Theme documents.

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2010-05-15
End Date (yyyy-mm-dd) 2010-05-16
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD351_CTD_CTD014t
Platform Categorylowered unmanned submersible

No Document Information Held for the Series


Cruise Name D351
Departure Date 2010-05-11
Arrival Date 2010-05-28
Principal Scientist(s)Jane F Read (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameExtended Ellett Line Station IB12A
CategoryOffshore location
Latitude60° 15.00' N
Longitude20° 0.00' W
Water depth below MSL2600.0 m

Extended Ellett Line: Fixed Station IB12A

Station IB12A is one of the fixed CTD stations, which together form The Extended Ellett Line. The line lies between Iceland and the Sound of Mull (Scotland) crossing the Iceland Basin and Rockall Trough via the outcrop of Rockall. As part of this initiative, CTD dips, together with associated discrete sampling of the water column, have typically been carried out annually at this station since May 2010.

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: Extended Ellett Line Station IB12A

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
1929721Currents -subsurface Eulerian2010-05-15 22:15:4460.2537 N, 19.9955 WRRS Discovery D351
1204210CTD or STD cast2012-08-12 23:55:0060.24989 N, 19.99982 WRRS Discovery D379
1370871CTD or STD cast2014-07-10 17:02:2060.2501 N, 19.9999 WRRS James Clark Ross JR20140531 (JR302)
1722873CTD or STD cast2015-06-05 11:22:5160.2481 N, 19.9988 WRRS Discovery DY031
1721962Currents -subsurface Eulerian2015-06-05 11:23:0960.24856 N, 19.99824 WRRS Discovery DY031
1878829Water sample data2015-06-05 12:34:0060.24742 N, 19.99975 WRRS Discovery DY031
1764255CTD or STD cast2016-06-12 19:31:4960.2504 N, 20.0008 WRRS Discovery DY052
1765387Currents -subsurface Eulerian2016-06-12 19:31:5960.25035 N, 20.00075 WRRS Discovery DY052
1874576Water sample data2016-06-12 20:41:0060.25035 N, 20.00076 WRRS Discovery DY052
1976455CTD or STD cast2017-05-24 12:41:5760.2492 N, 19.9913 WRRS Discovery DY078 (DY079)