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Metadata Report for BODC Series Reference Number 1853989

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_622:16229A
BODC Series Reference 1853989

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2007-08-06 01:06
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 59.01561 N ( 59° 0.9' N )
Longitude 19.30996 W ( 19° 18.6' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 9.0 m
Maximum Sensor or Sampling Depth 129.2 m
Minimum Sensor or Sampling Height 1824.5 m
Maximum Sensor or Sampling Height 1944.7 m
Sea Floor Depth 1953.7 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

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

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.

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) 2007-08-06
End Date (yyyy-mm-dd) 2007-08-06
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD321A_CTD_16229A
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for D321A_CTD_16229A

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
179341 20.00 1 1  810.90  813.30  802.90 Niskin bottle No problem reported    
179342 20.00 2 2  609.30  612.00  604.00 Niskin bottle No problem reported    
179343 20.00 3 3  406.90  408.40  403.40 Niskin bottle No problem reported    
179344 20.00 4 4  204.90  206.90  203.90 Niskin bottle No problem reported    
179345 20.00 5 5  129.80  130.30  128.80 Niskin bottle No problem reported    
179346 20.00 6 6  129.60  131.30  129.20 Niskin bottle No problem reported    
179347 20.00 7 7   79.00   79.80   78.60 Niskin bottle No problem reported    
179348 20.00 8 8   78.80   79.50   78.40 Niskin bottle No problem reported    
179349 20.00 9 9   49.40   51.40   49.90 Niskin bottle No problem reported    
179350 20.00 10 10   49.70   50.90   49.80 Niskin bottle No problem reported    
179351 20.00 11 11   36.30   36.60   36.10 Niskin bottle No problem reported    
179352 20.00 12 12   36.30   37.10   36.40 Niskin bottle No problem reported    
179353 20.00 13 13   35.80   36.90   36.00 Niskin bottle No problem reported    
179354 20.00 14 14   35.50   37.10   36.00 Niskin bottle No problem reported    
179355 20.00 15 15   30.70   31.30   30.70 Niskin bottle No problem reported    
179356 20.00 16 16   30.90   31.80   31.10 Niskin bottle No problem reported    
179357 20.00 17 17   23.90   24.90   24.20 Niskin bottle No problem reported    
179358 20.00 18 18   23.50   24.70   23.90 Niskin bottle No problem reported    
179359 20.00 19 19   13.70   14.30   13.90 Niskin bottle Bottle misfire   Bottle misfire reported
179360 20.00 20 20   13.40   14.70   13.90 Niskin bottle No problem reported    
179361 20.00 21 21   13.80   14.20   13.90 Niskin bottle No problem reported    
179362 20.00 22 22   13.40   14.40   13.80 Niskin bottle No problem reported    
179363 20.00 23 23    8.40    9.50    8.90 Niskin bottle No problem reported    
179364 20.00 24 24    8.60    9.50    9.00 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

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: D321A_CTD_16229A

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
1349358Water sample data2007-08-06 01:06:0059.01561 N, 19.30996 WRRS Discovery D321 (D321A)
2134030Water sample data2007-08-06 01:06:0059.01561 N, 19.30996 WRRS Discovery D321 (D321A)
2136190Water sample data2007-08-06 01:06:0059.01561 N, 19.30996 WRRS Discovery D321 (D321A)