Metadata Report for BODC Series Reference Number 2079293
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 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.
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.
CD176 Chlorophyll Sampling Document
Originator's Protocol for Data Acquisition and Analysis
Water samples were collected from CTD stations throughout the cruise for later analysis at SAMS. Samples were taken at depths corresponding to discernible water masses or areas exhibiting raised or lowered values as determined from the CTD fluorescence, temperature, salinity and oxygen traces.
Samples were removed from CTD Niskin bottles and filtered through Whatman GF/F 25mm diameter filter discs which were then placed in 15mm polypropylene centrifuge tubes before freezing. The samples later underwent High Performance Liquid Chromotography analysis at SAMS.
References Cited
Sherwin, T. A. et al, (2005) 'Cruise CD176 Birkenhead to Falmouth via Rockall, Iceland and Oban', Internal Report No 248, Scottish Association for Marine Science.
Available - Cruise CD176 Internal Report
BODC Data Processing Procedures
The chlorophyll data were supplied to BODC in Microsoft Excel format and values were extracted from this and saved in ASCII format prior to being loaded into BODC's ocean database under the ORACLE Relational Database Management System. Data that were considered unrealistic were flagged suspect.
It should be noted that there were some discrepencies with the metadata provided for this cruise. For cast C016 discrete chlorophyll data was only available from 4 bottles as oposed to the 12 bottles that the cruise report log indicated were sampled.
Content of data series
Originator's Parameter | Unit | Description | BODC Parameter code | BODC Unit | Comments |
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Chlorophyll a | µg/l | Concentration of chlorophyll a in the water column | CPHLHPP1 | mg/m3 | n/a |
Standard deviation of chlorophyll a | µg/l | Concentration standard deviation of chlorophyll a in the water column | SDCLHPP1 | mg/m3 | n/a |
Project Information
Northern Seas Programme
The Northern Seas describes an area extending from the Irish and northern North Sea across the Norwegian Sea up to the marginal Arctic pack-ice zone, including territorial waters of the UK, Norway, Iceland, Denmark and Russia. These waters are an important marine environment playing a significant part in regulating world climate due to the area's role in thermocline circulation in addition to acting as a sink for man-made pollutants carried north by ocean currents. These environments are experiencing increasing pressures from both natural and human impacts and consequently the Northern Seas Programme was developed to help advance the understanding of how marine systems in Northern Seas respond to environmental and anthropogenic change.
Scientific Objectives
The central aim of the programme was to 'improve understanding of how the sensitivity of marine ecosystems to environmental perturbation, both natural and anthropogenic, varies along a latitudinal gradient'.
This aim was addressed through the following integrated themes:
Theme A: Understanding fjordic systems: insights for coastal and oceanic processes
Theme B: Ocean Margins: the interface between the coastal zone and oceanic realm
Theme C: Measuring and modelling change: sea sensors and bioinformatics
The Northern Seas Programme was active between 2001 and 2007. The fieldwork programme to address these objectives was conducted by staff from the Scottish Association for Marine Science (SAMS).
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2005-10-12 |
End Date (yyyy-mm-dd) | 2005-10-12 |
Organization Undertaking Activity | Scottish Association for Marine Science |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | CD176_CTD_C016 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for CD176_CTD_C016
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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203589 | 7 | 7 | 808.20 | 809.20 | 799.70 | Niskin bottle | No problem reported | |||
203590 | 8 | 8 | 757.50 | 758.50 | 749.60 | Niskin bottle | No problem reported | |||
203591 | 9 | 9 | 709.40 | 710.40 | 702.10 | Niskin bottle | No problem reported | |||
203592 | 10 | 10 | 657.00 | 658.00 | 650.40 | Niskin bottle | No problem reported | |||
203593 | 11 | 11 | 606.90 | 607.90 | 600.90 | Niskin bottle | No problem reported | |||
203594 | 12 | 12 | 556.30 | 557.30 | 550.90 | Niskin bottle | No problem reported | |||
203595 | 13 | 13 | 404.30 | 405.30 | 400.70 | Niskin bottle | No problem reported | |||
203596 | 14 | 14 | 152.50 | 153.50 | 151.50 | Niskin bottle | No problem reported | |||
203597 | 15 | 15 | 82.20 | 83.20 | 81.90 | Niskin bottle | No problem reported | |||
203598 | 16 | 16 | 31.50 | 32.50 | 31.70 | Niskin bottle | No problem reported | |||
203599 | 17 | 17 | 16.70 | 17.70 | 17.00 | Niskin bottle | No problem reported | |||
203600 | 18 | 18 | 6.10 | 7.10 | 6.50 | Niskin bottle | No problem reported | |||
203618 | 1 | 1 | 1471.60 | 1472.60 | 1453.40 | Niskin bottle | No problem reported | |||
203619 | 2 | 2 | 1447.50 | 1448.50 | 1429.70 | Niskin bottle | No problem reported | |||
203620 | 3 | 3 | 1421.60 | 1422.60 | 1404.20 | Niskin bottle | No problem reported | |||
203621 | 4 | 4 | 1321.10 | 1322.10 | 1305.30 | Niskin bottle | No problem reported | |||
203635 | 5 | 5 | 1114.70 | 1115.70 | 1102.00 | Niskin bottle | No problem reported | |||
203636 | 6 | 6 | 911.30 | 912.30 | 901.40 | 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 | CD176 |
Departure Date | 2005-10-06 |
Arrival Date | 2005-11-01 |
Principal Scientist(s) | Toby J Sherwin (Scottish Association for Marine Science) |
Ship | RRS Charles Darwin |
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: CD176_CTD_C016
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 |
---|---|---|---|---|
2139728 | Water sample data | 2005-10-12 09:01:44 | 57.53732 N, 12.7475 W | RRS Charles Darwin CD176 |
1350937 | Water sample data | 2005-10-12 09:02:00 | 57.53732 N, 12.7475 W | RRS Charles Darwin CD176 |