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Metadata Report for BODC Series Reference Number 2119715

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Waterproof thermometer  water temperature sensor
Teflon-coated Niskin bottle  discrete water samplers
Unknown semi-automated oxygen titration system  titrators
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Louis Byrne
Originating Organization British Oceanographic Data Centre, Liverpool
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) SSB CaNDyFloSS

Data Identifiers

Originator's Identifier DY034_UCCTD_DOXY_3731:132
BODC Series Reference 2119715

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-08-11 15:45
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 51.07243 N ( 51° 4.3' N )
Longitude 6.58124 W ( 6° 34.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 26.7 m
Maximum Sensor or Sampling Depth 96.4 m
Minimum Sensor or Sampling Height -2.1 m
Maximum Sensor or Sampling Height 67.6 m
Sea Floor Depth 94.3 m
Sea Floor Depth Source BUDS
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
OXYTMP011Degrees CelsiusTemperature of oxygen fixation
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

Unknown semi-automated oxygen titration system

A semi-automated titration system used to measure the concentration of dissolved oxygen in water samples, where the instrument manufacturer and model is not known. Oxygen titration systems usually consist of a burette and chemical resevoir and are often based on the Winkler titration method. They can use either potentiometric, amperometric or photometric end point detection.

Currently no specifications sheet available.

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.

Cruise DY034 Dissolved Oxygen from CTD bottles

Originator's Protocol for Data Acquisition and Analysis

A total of 28 CTD casts were made during cruise DY034 in August 2015 using a stainless steel (22 casts) or titanium CTD package (6 casts). Discrete samples were taken from one to seven Niskin bottles from each CTD cast in order to calibrate the optode of the CTDs. A description of the stainless steel CTD package can be found here. A description of the titanium CTD package can be found here..

Samples were fixed and titrated against thiosulphate solution following the Winkler titration method. The fixing temperature was recorded on a hand-held thermometer.

BODC Data Processing Procedures

Data were provided in an Excel spreadsheet and archived at BODC. The file contained the water sample data from CTD bottles. Data received were loaded into the BODC database using established BODC data banking procedures. The data values were submitted as single measurements, or two to three sample replicates. Where duplicate oxygen concentration values were supplied the average and standard deviation of oxygen and temperature were calculated and loaded to the database.

The originator variables were mapped to appropriate BODC parameter codes as follows:

Originator's Variable Units Description BODC Parameter Code BODC Units Comments
O2_in_situ µmol L-1 Concentration of oxygen by Winkler titration DOXYWITX µmol L-1 -
Temp_fix degrees Celsius Temperature of the oxygen fixation OXYTMP01 degrees Celsius -

Data Quality Report

A comparison between the originator's metadata and that held centrally at BODC found one discrepancy between the originator's supplied depth and that held in the database (OID/EVENT = 406, ROSPOS = 16). The scanned log sheets from the cruise (at BODC) clearly showed this was an originator scribing error and the depth was 60 m. (BODC assessment).

Problem Report

None (BODC assessment).

Project Information

Shelf Sea Biogeochemistry (SSB) Programme Work Package 1: CaNDyFloSS

Carbon and Nutrient Dynamics and Fluxes over Shelf Systems (CaNDyFloSS) is a £2.76 million component of the Natural Environment Research Council (NERC) Shelf Sea Biogeochemistry (SSB) research programme, running from 2013 to 2017. It is jointly funded by NERC and the Department for Environment, Food and Rural Affairs (DEFRA). The aim of the research is to perform a comprehensive study of the cycling of nutrients and carbon throughout the water column over the whole north-west European shelf. This will allow the fluxes of nutrients and carbon between the shelf and the deep ocean and atmosphere to be quantified, establishing the role of the north-west European continental shelf in the global carbon cycle.


Shelf seas are the primary regions of human marine resource exploitation, including both renewable and fossil fuel energy sources, recreation, trade and food production. They provide 90% of global fish catches which form an important source of food to much of the global population. They also play an important role in the ecosystem services provided by the oceans as a whole, in particular in storing carbon away from the atmosphere.

Physical and biochemical processes in shelf seas influence the removal of CO2 from the atmosphere and the subsequent storage of carbon in the deep ocean. Biological growth draws carbon out of the water, which is then replaced by carbon in CO2 from the atmosphere. In the shelf seas this growth is supported by terrestrial and open ocean sources of nutrients, implying intimate roles for both the terrestrial biosphere and the open ocean environment in regulating shelf sea climate services. The oceans can also be a major source or sink for other greenhouse gases, including nitrous oxide (N2O), with the shallow shelf sea thought to play a key role.

The spatial extent of the submerged continental shelves varies greatly. The NW European shelf sea is one of the largest and hence is likely to play a significant role in marine biogeochemical cycling, alongside providing a useful model for other systems. However, even in this relatively well studied region, there is a lack of detailed understanding of the principal controls on the cycling of carbon and the major nutrient elements, nitrogen, phosphorus and silicon. Consequently it is also difficult to predict how the cycling of these elements and hence the carbon removal they support may be altered by ongoing and potential future global change. This work package aims to address these uncertainties through a comprehensive study of the cycling of the major nutrients and carbon throughout the water column over the NW European shelf sea system.

Further details are available on the SSB website.


9 different organisations are directly involved in research for SSB Work Package 1. These institutions are

  • Centre for Environment, Fisheries and Aquaculture Science (Cefas)
  • National Oceanography Centre (NOC)
  • Plymouth Marine Laboratory (PML)
  • Scottish Association for Marine Science (SAMS) / Scottish Marine Institute (SMI)
  • University of Aberdeen
  • University of Bangor
  • University of East Anglia (UEA)
  • University of Liverpool
  • University of Southampton

In addition, there are third party institutions carrying out sampling work for SSB Work Package 1, but who are not involved in the programme itself. These are:

  • The Agri-Food and Biosciences Institute (AFBI)
  • Irish Marine Institute (MI)
  • Marine Science Scotland (MSS)


Two overarching objectives are defined for this Work Package.

  • Objective 1: Estimate the size of the continental shelf carbon pump over the whole north-west European shelf.
    This will consist of two principal activities. (1) Over a 12 month period, observations of air-sea CO2 fluxes will be made to provide a synoptic estimate of the magnitude of carbon update by the whole shelf system. (2) Concentrations of carbon (C), nitrogen (N), phosphate (P) and silicate (Si) will be estimated in water flowing on and off the shelf. These estimates will be coupled to estimates of flow and dispersion along the shelf edge, through collaboration with the NERC Fluxes across Sloping Topography of the North East Atlantic (FASTNEt) programme to allow an observational estimate of the net off-shelf transport of C, N, P and Si.

  • Objective 2: Determine the relative importance of external nutrient sources and internal biogeochemical cycling in maintaining the continental shelf pump.
    Estimates of the flux of nutrients and carbon generated in Objective 1 will be used to determine the estimation of any excess of on-shelf nutrient supply, relative to that of carbon. Work Package 1 will then quantify the processes which govern internal biogeochemical cycling by measuring the uptake ratios of N, P, Si and C into phytoplankton and the element and energy balance of organic matter production by autotrophs. Potential modifications to the relative concentrations and uptake of C, N, P and Si in the thermocline and sediment food webs will also be assessed, as will the relative importance of microbial and zooplankton turnover in controlling C, N, P and Si.

Fieldwork and data collection

Data for Objective 1 will be provided using pCO2 systems aboard third party vessels and ferry boxes, along with measurements made through the FASTNEt programme and through the Work Package 1 process cruises detailed below. The third party cruises will be undertaken by Cefas, MI, MSS, University of Bangor and AFBI, spanning the shelf seas and shelf-edges around the United Kingdom and the Republic of Ireland.

The Work Package 1 process cruises will provide data for Objective 1 and Objective 2 and are listed in the table below. The study area is the marine shelf (and shelf-edge) of the Celtic Sea. Work will be carried out on board the NERC research vessels RRS Discovery and RRS James Cook. These cruises will focus on the physics and biogeochemistry of the benthic and pelagic zones of the water column, primarily around four main sampling sites in this area.

Cruise identifier Research ship Cruise dates Work packages
JC105 RRS James Cook June 2014 WP 1, WP 2 and WP 3
DY026 RRS Discovery August 2014 WP1, WP 2 and WP 3
DY018 RRS Discovery November - December 2014 WP 1 and WP 3
DY029 RRS Discovery April 2015 WP 1 and WP 3
DY033 RRS Discovery July 2015 WP 1 and WP 3

Activities will include Conductivity Temperature and Depth (CTD) deployments, Acoustic Doppler Current Profilers (ADCP) surveys, moorings and wire-walker deployments, autonomous gliders and submersible surveys, Marine Snow Catcher particulate matter analysis, plankton net hauls and laboratory incubations with sea water samples.

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2015-08-11
End Date (yyyy-mm-dd) 2015-08-11
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDY034_UCCTD_132
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for DY034_UCCTD_132

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
1084085   10.00 2     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084088   10.00 3     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084091   10.00 4     97.50   98.50   96.50 Teflon-coated Niskin bottle No problem reported    
1084094   10.00 5     97.20   98.20   96.20 Teflon-coated Niskin bottle No problem reported    
1084097   10.00 6     97.30   98.30   96.30 Teflon-coated Niskin bottle No problem reported    
1084100   10.00 7     97.50   98.50   96.50 Teflon-coated Niskin bottle No problem reported    
1084103   10.00 8     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084106   10.00 9     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084109   10.00 10     97.20   98.20   96.20 Teflon-coated Niskin bottle No problem reported    
1084112   10.00 11     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084115   10.00 14     97.40   98.40   96.40 Teflon-coated Niskin bottle No problem reported    
1084118   10.00 15     97.30   98.30   96.30 Teflon-coated Niskin bottle No problem reported    
1084121   10.00 16     82.40   83.40   81.50 Teflon-coated Niskin bottle No problem reported    
1084124   10.00 17     82.70   83.70   81.80 Teflon-coated Niskin bottle No problem reported    
1084127   10.00 18     62.60   63.60   61.90 Teflon-coated Niskin bottle No problem reported    
1084130   10.00 19     62.80   63.80   62.10 Teflon-coated Niskin bottle No problem reported    
1084133   10.00 20     47.60   48.60   47.00 Teflon-coated Niskin bottle No problem reported    
1084136   10.00 21     47.70   48.70   47.10 Teflon-coated Niskin bottle No problem reported    
1084139   10.00 22     27.30   28.30   26.90 Teflon-coated Niskin bottle No problem reported    
1084142   10.00 23     27.10   28.10   26.70 Teflon-coated 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.


Cruise Name DY034
Departure Date 2015-08-06
Arrival Date 2015-09-02
Principal Scientist(s)Henry Ruhl (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameShelf Seas Biogeochemistry Fixed Station Benthic G
CategoryOffshore area
Latitude51° 4.40' N
Longitude6° 34.85' W
Water depth below MSL103.0 m

Shelf Seas Biogeochemistry Fixed Station Benthic G

This station is one of four benthic sites sampled on the Celtic Sea shelf as part of work package II of the Shelf Seas Biogeochemistry project. The station has a mean water depth 109 m at the following co-ordinates:

Box Corner Latitude Longitude
North-west corner 51.0764° -6.5848°
South-east corner 51.0702° -6.5770°

The position of this station relative to the other Shelf Seas Biogeochemistry sites can be seen from the figure below.

BODC image

Sampling History

CTD casts 2
Box cores 65
SPI camera 19
Stand Alone Pump Systems (SAPS) 1
Benthic flume 2
Autosub6000 2
Glider deployments 1

Mooring deployments

Latitude Longitude Water depth (m) Moored instrument Deployment date Recovery date Deployment cruise Recovery cruise
51.0749° -6.5848° 100 NOC-L benthic lander 31-03-2014 12:54 UTC 07-04-2014 09:09 UTC DY008 DY008

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: Shelf Seas Biogeochemistry Fixed Station Benthic G

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
1371604CTD or STD cast2014-04-02 17:42:0051.07287 N, 6.58117 WRRS Discovery DY008
1336735Water sample data2014-04-02 17:43:0051.07285 N, 6.58116 WRRS Discovery DY008
1371616CTD or STD cast2014-04-04 11:47:0051.0726 N, 6.58027 WRRS Discovery DY008
2117561Water sample data2014-04-04 11:50:3051.0726 N, 6.58026 WRRS Discovery DY008
2119113Water sample data2014-04-04 11:50:3051.0726 N, 6.58026 WRRS Discovery DY008
1336747Water sample data2014-04-04 11:51:0051.0726 N, 6.58026 WRRS Discovery DY008
2119660Water sample data2015-03-08 07:42:3051.07249 N, 6.58106 WRRS Discovery DY021
2121664Water sample data2015-03-08 07:42:3051.07249 N, 6.58106 WRRS Discovery DY021
2127395Water sample data2015-03-08 07:42:3051.07249 N, 6.58106 WRRS Discovery DY021
2134331Water sample data2015-03-08 07:42:3051.07249 N, 6.58106 WRRS Discovery DY021
2118042Water sample data2015-03-08 10:50:0051.07241 N, 6.58103 WRRS Discovery DY021
2127230Water sample data2015-03-08 10:50:0051.07241 N, 6.58103 WRRS Discovery DY021
2135844Water sample data2015-03-08 10:50:0051.07241 N, 6.58103 WRRS Discovery DY021
1624669CTD or STD cast2015-05-06 13:57:0051.07416 N, 6.58435 WRRS Discovery DY030
2132373Water sample data2015-05-06 14:09:0051.07491 N, 6.58435 WRRS Discovery DY030
2137734Water sample data2015-05-06 14:09:0051.07491 N, 6.58435 WRRS Discovery DY030
1624670CTD or STD cast2015-05-06 15:33:0051.07491 N, 6.58437 WRRS Discovery DY030
1624589CTD or STD cast2015-05-06 17:03:0051.07492 N, 6.5843 WRRS Discovery DY030
2123370Water sample data2015-05-06 17:17:0051.07492 N, 6.58436 WRRS Discovery DY030
1624682CTD or STD cast2015-05-08 08:30:0051.14136 N, 6.57319 WRRS Discovery DY030
1624694CTD or STD cast2015-05-08 14:47:0051.07506 N, 6.58458 WRRS Discovery DY030
2132397Water sample data2015-05-08 14:57:3051.07507 N, 6.58459 WRRS Discovery DY030
2137746Water sample data2015-05-08 14:57:3051.07507 N, 6.58459 WRRS Discovery DY030
1624786CTD or STD cast2015-05-13 08:51:0051.07433 N, 6.58489 WRRS Discovery DY030
1624798CTD or STD cast2015-05-13 14:40:0051.07452 N, 6.58398 WRRS Discovery DY030
1721279CTD or STD cast2015-08-08 15:22:0051.06715 N, 6.58203 WRRS Discovery DY034
2122262Water sample data2015-08-08 15:39:3051.06715 N, 6.58202 WRRS Discovery DY034
1721292CTD or STD cast2015-08-10 11:14:0051.07085 N, 6.57735 WRRS Discovery DY034
1721556CTD or STD cast2015-08-11 15:32:0051.07243 N, 6.58127 WRRS Discovery DY034
1721311CTD or STD cast2015-08-11 16:31:0051.07242 N, 6.58113 WRRS Discovery DY034
1721323CTD or STD cast2015-08-11 17:36:0051.0724 N, 6.58103 WRRS Discovery DY034
1721359CTD or STD cast2015-08-13 15:50:0051.07262 N, 6.58162 WRRS Discovery DY034
1721624CTD or STD cast2015-08-29 06:16:0051.07275 N, 6.58083 WRRS Discovery DY034