Metadata Report for BODC Series Reference Number 1713206
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||||||
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Parameters |
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Definition of BOTTFLAG | |||||||||||||||||||||||||||||
BOTTFLAG | Definition |
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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 |
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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.
Deployment
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.
UKOA D366 chlorophyll-a (total and size-fractionated) concentrations from CTD bottle samples
Originator's Protocol for Data Acquisition and Analysis
Aliquots of 100-200 mL from 5-8 depths were filtered onto 25 mm Glass Fibre (GF/F) filters, 5µm or 10µm pore size polycarbonate filters (to yield a total, >5µm and >10µm size fraction, respectively and therefore by difference a <5 and <10 µm size fraction). All filters were extracted in 90% acetone for 24 h, and chlorophyll-a quantified with a Turner Designs Trilogy fluorometer. Final chlorophyll a concentrations were obtained via dilutions of a solution of pure chlorophyll a (Sigma, UK) in 90% acetone and a solid standard.
Instrumentation Description
Turner Designs Trilogy fluorometer
BODC Data Processing Procedures
Data were submitted via email in an Excel spreadsheet archived under BODC's accession number SOC130148. Sample metadata (Date, CTD cast and depth) were checked against information held in the database. There were a couple of minor depth discrepancies - for cast 35 samples were provided with depths 80 m and 50 m, the logsheets indicate these should be 8 m and 5 m respectively.
The concentration data were provided in micrograms per litre. These units are equivalent to the BODC parameter code units (milligrams per cubic metre) and no unit conversion was applied.
The data were reformatted and loaded in BODC's samples database under Oracle Relational Database Management System. Data were marked up with BODC parameter codes and loaded into the database.
A parameter mapping table is provided below;
Originator's Parameter | Units | Description | BODC Parameter Code | Units | Comments |
---|---|---|---|---|---|
Chl-a (total) | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry | CPHLFLP1 | mg m-3 | n/a |
Chl-a (>5) | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >5µm phase] by filtration, acetone extraction and fluorometry | SCHLFLPA | mg m-3 | n/a |
Chl-a (>10) | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >10µm phase] by filtration, acetone extraction and fluorometry | SCHLFLPO | mg m-3 | n/a |
Chl-a (<5) | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate GF/F-5µm phase] by filtration, acetone extraction and fluorometry | SCHLFLPM | mg m-3 | n/a |
Data Quality Report
There were no comments provided on the data quality.
Problem Report
Not relevant to this data set.
Project Information
UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate
The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.
The aims of the theme are:
- To ascertain the impact of OA on planktonic organisms (in terms of physiological impacts, morphology, population abundances and community composition).
- To quantify the impacts of OA on biogeochemical processes affecting the ocean carbon cycle (both directly and indirectly, such as via availability of bio-limiting nutrients).
- To quantify the impacts of OA on the air-sea flux of climate active gases (DMS and N2O in particular).
The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO2. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.
Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2011-06-25 |
End Date (yyyy-mm-dd) | Ongoing |
Organization Undertaking Activity | University of Southampton School of Ocean and Earth Science |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | D366_CTD_D366040 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for D366_CTD_D366040
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 |
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624668 | 20.00 | 1 | 1 | 36.80 | 37.00 | 35.90 | Niskin bottle | Bottle leak | ||
624671 | 20.00 | 2 | 2 | 36.80 | 37.00 | 35.90 | Niskin bottle | No problem reported | ||
624674 | 20.00 | 3 | 3 | 36.80 | 37.00 | 35.90 | Niskin bottle | No problem reported | ||
624677 | 20.00 | 4 | 4 | 36.80 | 37.00 | 35.90 | Niskin bottle | Bottle leak | ||
624680 | 20.00 | 5 | 5 | 25.60 | 25.90 | 24.80 | Niskin bottle | No problem reported | ||
624683 | 20.00 | 6 | 6 | 25.60 | 25.80 | 24.80 | Niskin bottle | No problem reported | ||
624686 | 20.00 | 7 | 7 | 25.60 | 25.90 | 24.80 | Niskin bottle | No problem reported | ||
624689 | 20.00 | 8 | 8 | 25.50 | 25.90 | 24.80 | Niskin bottle | No problem reported | ||
624692 | 20.00 | 9 | 9 | 18.60 | 18.80 | 17.80 | Niskin bottle | No problem reported | ||
624695 | 20.00 | 10 | 10 | 18.70 | 18.80 | 17.90 | Niskin bottle | No problem reported | ||
624698 | 20.00 | 11 | 11 | 18.60 | 18.80 | 17.80 | Niskin bottle | No problem reported | ||
624701 | 20.00 | 12 | 12 | 18.60 | 18.80 | 17.80 | Niskin bottle | No problem reported | ||
624704 | 20.00 | 13 | 13 | 12.40 | 12.60 | 11.70 | Niskin bottle | No problem reported | ||
624707 | 20.00 | 14 | 14 | 12.40 | 12.60 | 11.70 | Niskin bottle | No problem reported | ||
624710 | 20.00 | 15 | 15 | 12.40 | 12.60 | 11.70 | Niskin bottle | No problem reported | ||
624713 | 20.00 | 16 | 16 | 12.40 | 12.60 | 11.70 | Niskin bottle | No problem reported | ||
624716 | 20.00 | 17 | 17 | 8.50 | 8.70 | 7.80 | Niskin bottle | No problem reported | ||
624719 | 20.00 | 18 | 18 | 8.50 | 8.70 | 7.80 | Niskin bottle | No problem reported | ||
624722 | 20.00 | 19 | 19 | 8.40 | 8.70 | 7.80 | Niskin bottle | No problem reported | ||
624725 | 20.00 | 20 | 20 | 8.40 | 8.90 | 7.90 | Niskin bottle | No problem reported | ||
624728 | 20.00 | 21 | 21 | 4.40 | 4.80 | 3.80 | Niskin bottle | No problem reported | ||
624731 | 20.00 | 22 | 22 | 4.40 | 4.80 | 3.80 | Niskin bottle | No problem reported | ||
624734 | 20.00 | 23 | 23 | 4.40 | 4.80 | 3.80 | Niskin bottle | No problem reported | ||
624737 | 20.00 | 24 | 24 | 4.40 | 4.80 | 3.80 | 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
Cruise Name | D366 (D367) |
Departure Date | 2011-06-06 |
Arrival Date | 2011-07-09 |
Principal Scientist(s) | Eric Pieter Achterberg (University of Southampton School of Ocean and Earth Science) |
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: D366_CTD_D366040
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 |
---|---|---|---|---|
1249020 | Water sample data | 2011-06-25 06:02:00 | 50.42015 N, 0.15014 E | RRS Discovery D366 (D367) |
2116846 | Water sample data | 2011-06-25 06:02:00 | 50.42015 N, 0.15014 E | RRS Discovery D366 (D367) |
2126054 | Water sample data | 2011-06-25 06:02:00 | 50.42015 N, 0.15014 E | RRS Discovery D366 (D367) |
2135402 | Water sample data | 2011-06-25 06:02:00 | 50.42015 N, 0.15014 E | RRS Discovery D366 (D367) |