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Metadata Report for BODC Series Reference Number 1853627

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Prof Mark Moore
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 D321A_CTD_PIGX_622:16195A
BODC Series Reference 1853627

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2007-07-27 14:03
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 58.94953 N ( 58° 57.0' N )
Longitude 17.18484 W ( 17° 11.1' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 9.1 m
Maximum Sensor or Sampling Depth 78.6 m
Minimum Sensor or Sampling Height 802.9 m
Maximum Sensor or Sampling Height 872.4 m
Sea Floor Depth 881.5 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)
CPHLFLP11Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
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 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.

Chlorophyll Samples from CTD Bottles for D321A

Originator's Protocol for Data Acquisition and Analysis

Discrete chlorophyll-a samples were collected from the CTD Niskin bottles. Exactly 200 mL of seawater were filtered on GF/F filters and chlorophyll-a (chl-a) was extracted in 10 mL 90% acetone for about 24 hours at 4 °C. Measurements were made on a Turner fluorometer following the Welschmeyer protocol (Welschmeyer, 1994) calibrated against a spectrophotometrically determined calibration curve of commercial grade (SIGMA) chl-a using the SCOR/UNESCO tri-chromatic equations.

References Cited

Welschmeyer N.A., 1994. Fluorometric analysis of chlorophyll a in the presence of chlorophyll b and phaeopigments. Limnology & Oceanography, 39, 1985-1992.

BODC Data Processing Procedures

Data received were loaded into the BODC database using established BODC data banking procedures. The data were loaded into BODC's database without any further changes.

The table below shows how originator's variables were mapped to BODC parameter codes:

Originator's Parameter Unit Description BODC Parameter Code BODC Unit Comments
Chlorophyll mg m-3 Chlorophyll-a concentration of the water column CPHLFLP1 mg m-3 n/a

Data Quality Report

The following data was flagged by the originator:

Station Depth Comments
16274A 5m The bottle was not fired due to heavy weather - therefore underway value used.
16282A 5m Identified as the originator as possibly being underway data.
16286A 5m Identified as the originator as possibly being underway data.
16296B 10m Not fired according to the log sheets, but data exists.

For station 16239A the depth of 300m was associated with one of the firings, but according to the data files and log sheets there were no firings at this depth. Therefore, this depth was amended to 400m, by BODC, where bottles had been fired.

Problem Report


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) 2007-07-27
End Date (yyyy-mm-dd) 2007-07-27
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD321A_CTD_16195A
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for D321A_CTD_16195A

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
177575   20.00 23 23    8.90    9.80    9.30 Niskin bottle No problem reported    
177576   20.00 24 24    8.80    9.60    9.10 Niskin bottle No problem reported    
177767   20.00 1 1  892.80  894.60  883.40 Niskin bottle No problem reported    
177768   20.00 2 2  893.00  894.50  883.50 Niskin bottle No problem reported    
177769   20.00 3 3  730.30  731.10  722.60 Niskin bottle No problem reported    
177770   20.00 4 4  730.40  731.90  723.00 Niskin bottle Partial sample loss   Top failed to close
177771   20.00 5 5  609.70  611.30  603.90 Niskin bottle No problem reported    
177772   20.00 6 6  610.00  611.00  603.90 Niskin bottle No problem reported    
177773   20.00 7 7  508.50  509.70  503.70 Niskin bottle No problem reported    
177774   20.00 8 8  508.90  509.60  503.90 Niskin bottle No problem reported    
177775   20.00 9 9  407.30  409.20  404.00 Niskin bottle No problem reported    
177776   20.00 10 10  306.30  307.50  303.80 Niskin bottle No problem reported    
177777   20.00 11 11  205.90  206.30  204.10 Niskin bottle No problem reported    
177778   20.00 12 12  129.70  130.20  128.70 Niskin bottle No problem reported    
177779   20.00 13 13   78.70   79.90   78.50 Niskin bottle No problem reported    
177780   20.00 14 14   79.20   79.60   78.60 Niskin bottle No problem reported    
177781   20.00 15 15   53.80   54.80   53.80 Niskin bottle No problem reported    
177782   20.00 16 16   54.00   55.40   54.20 Niskin bottle No problem reported    
177783   20.00 18 18   44.30   45.00   44.20 Niskin bottle No problem reported    
177784   20.00 19 19   33.90   34.50   33.90 Niskin bottle No problem reported    
177785   20.00 20 20   33.90   34.80   34.00 Niskin bottle No problem reported    
177786   20.00 21 21   18.80   19.40   18.90 Niskin bottle No problem reported    
177787   20.00 22 22   18.80   19.50   19.00 Niskin bottle No problem reported    
178130   20.00 17 17   43.60   45.40   44.10 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 D321 (D321A)
Departure Date 2007-07-24
Arrival Date 2007-08-23
Principal Scientist(s)John T Allen (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 IB6
CategoryOffshore location
Latitude58° 57.00' N
Longitude17° 10.98' W
Water depth below MSL850.0 m

Extended Ellett Line: Fixed Station IB6

Station IB6 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 September 1996.

Related Fixed Station activities are detailed in Appendix 2

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: D321A_CTD_16195A

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
1349008Water sample data2007-07-27 14:03:0058.94953 N, 17.18484 WRRS Discovery D321 (D321A)

Appendix 2: Extended Ellett Line Station IB6

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
1008429CTD or STD cast1997-09-12 03:54:0058.949 N, 17.23233 WRRS Discovery D230
1304905Water sample data1997-09-12 04:21:0058.94905 N, 17.23234 WRRS Discovery D230
1020533CTD or STD cast1998-05-24 17:29:0058.96833 N, 17.195 WRRS Discovery D233
1849339Water sample data1998-05-24 18:01:0058.96836 N, 17.19492 WRRS Discovery D233
1070880CTD or STD cast1999-09-15 00:17:0058.94867 N, 17.231 WRRS Discovery D242
1252236Water sample data1999-09-15 00:34:0058.94867 N, 17.231 WRRS Discovery D242
772245CTD or STD cast2007-07-27 13:25:5558.9502 N, 17.1847 WRRS Discovery D321 (D321A)
954100CTD or STD cast2009-06-15 06:44:4558.94977 N, 17.18553 WRRS Discovery D340A
1052596CTD or STD cast2010-05-17 18:07:4558.94783 N, 17.19133 WRRS Discovery D351
1929801Currents -subsurface Eulerian2010-05-17 18:08:1158.9502 N, 17.1872 WRRS Discovery D351
1896603Water sample data2010-05-17 18:49:0058.94773 N, 17.19103 WRRS Discovery D351
1204074CTD or STD cast2012-08-11 04:26:0058.95064 N, 17.18152 WRRS Discovery D379
1220234CTD or STD cast2013-05-17 08:26:3558.9502 N, 17.183 WRRS James Cook JC086
1370766CTD or STD cast2014-07-09 14:13:1558.9289 N, 17.1994 WRRS James Clark Ross JR20140531 (JR302)
1722977CTD or STD cast2015-06-07 08:33:3458.9486 N, 17.1836 WRRS Discovery DY031
1722050Currents -subsurface Eulerian2015-06-07 08:34:0358.94864 N, 17.18366 WRRS Discovery DY031
1878909Water sample data2015-06-07 09:05:0058.94866 N, 17.1836 WRRS Discovery DY031
1764359CTD or STD cast2016-06-14 07:09:1458.9496 N, 17.1852 WRRS Discovery DY052
1765480Currents -subsurface Eulerian2016-06-14 07:09:2658.94956 N, 17.18518 WRRS Discovery DY052
1874668Water sample data2016-06-14 07:41:0058.94956 N, 17.18518 WRRS Discovery DY052
1976271CTD or STD cast2017-05-21 00:52:5658.9498 N, 17.1836 WRRS Discovery DY078 (DY079)
1976363CTD or STD cast2017-05-23 06:53:0458.9511 N, 17.1795 WRRS Discovery DY078 (DY079)