Metadata Report for BODC Series Reference Number 1853861
Definition of BOTTFLAG
|0||The sampling event occurred without any incident being reported to BODC.|
|1||The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material.|
|2||Analytical 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.|
|3||The 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.|
|4||During 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.|
|5||Water was reported to be escaping from the bottle as the rosette was being recovered.|
|6||The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery.|
|7||Either 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).|
|8||There is reason to doubt the accuracy of the sampling depth associated with the sample.|
|9||The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage.|
Definition of Rank
No Problem Report Found in the Database
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."
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.
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.
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.
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:
|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.
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.
|Start Date (yyyy-mm-dd)||2007-08-01|
|End Date (yyyy-mm-dd)||2007-08-01|
|Organization Undertaking Activity||National Oceanography Centre, Southampton|
|Country of Organization||United Kingdom|
|Originator's Data Activity Identifier||D321A_CTD_16217A|
|Platform Category||lowered unmanned submersible|
BODC Sample Metadata Report for D321A_CTD_16217A
|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|
|177932||20.00||1||1||812.30||813.60||803.80||Niskin bottle||Bottle leak||Bottle leak reported|
|177933||20.00||2||2||609.30||611.20||603.60||Niskin bottle||No problem reported|
|177934||20.00||3||3||406.30||407.40||402.60||Niskin bottle||No problem reported|
|177935||20.00||4||4||205.10||206.80||203.90||Niskin bottle||Bottle leak||Bottle leak reported|
|177936||20.00||5||5||129.50||132.00||129.50||Niskin bottle||No problem reported|
|177937||20.00||6||6||78.80||81.00||79.10||Niskin bottle||No problem reported|
|177938||20.00||7||7||50.60||53.00||51.30||Niskin bottle||No problem reported|
|177939||20.00||8||8||36.70||37.10||36.60||Niskin bottle||No problem reported|
|177940||20.00||9||9||30.90||32.30||31.30||Niskin bottle||No problem reported|
|177941||20.00||10||10||24.30||24.80||24.30||Niskin bottle||No problem reported|
|177942||20.00||11||11||14.10||14.70||14.30||Niskin bottle||No problem reported|
|177943||20.00||12||12||6.70||7.90||7.20||Niskin bottle||No problem reported|
|177944||20.00||13||13||7.20||8.20||7.60||Niskin bottle||No problem reported|
|177945||20.00||14||14||7.20||8.00||7.50||Niskin bottle||No problem reported|
|177946||20.00||15||15||7.20||7.90||7.50||Niskin bottle||No problem reported|
|177947||20.00||16||16||7.30||8.10||7.60||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)|
|Principal Scientist(s)||John T Allen (National Oceanography Centre, Southampton)|
Complete Cruise Metadata Report is available here
No Fixed Station Information held for the Series
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||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.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|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|
|O||Improbable value - user quality control|
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|
|Q||value below limit of quantification|
Appendix 1: D321A_CTD_16217A
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 Identifier||Data Category||Start date/time||Start position||Cruise|
|1349230||Water sample data||2007-08-01 03:54:00||59.15049 N, 19.31729 W||RRS Discovery D321 (D321A)|