Metadata Report for BODC Series Reference Number 1965248
Metadata Summary
Problem Reports
Data Access Policy
Data 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
COMICS research programme data access conditions - phase 1
These data are currently restricted to the COMICS Community.
Data Policy
COMICS Data Policy - phase 1
These data are currently restricted to the COMICS Community. The restriction timeline is based on the data submission/accession date due to the amount of time taken to work up some of the data. Individual datasets are restricted to the COMICS project participants for two years after their accession date.
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.
Turner Designs Trilogy Fluorometer
The Trilogy Laboratory Fluorometer is a compact laboratory instrument for making fluorescence, absorbance and turbidity measurements using the appropriate snap-in Application Module.
The following snap-in application modules are available:
Application | Minimum Detection Limit | Linear Range | Comments | |
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Ammonium | 0.05µmol | 0-50µmol | ||
CDOM/FDOM | 0.1 ppb | 0 - 1000 ppb | Quinine sulphate | |
Chlorophyll-a extracted (acidification) | 0.025 µg l-1 | 0-300 µg l-1 | ||
Chlorophyll-a extracted (non-acidification) | 0.025 µg l-1 | 0-300 µg l-1 | ||
Chlorophyll in vivo | 0.025 µg l-1 | 0-300 µg l-1 | ||
Fluorescein dye standard range | 0.01 ppb | 0-200 ppb | ||
Fluorescein dye extended range | 0.75 ppb | 0-8000 ppb | Minicell adapter P/N 8000-936 and P/N 7000-950 required | |
Histamine | 0.001 ppm | 0-100 ppm | ||
Histamine (PTSA) | 0.5 ppm | 0-2,000 ppm | ||
Nitrate (absorbance) | 0.04 mg l-1 | 0 - 14 mg l-1 | ||
Crude Oil | 0.2 ppb | 0 - 2,000 ppb | Quinine sulphate | |
Refined Oil | 0.25 ppb | 0 - 6,000 ppb Napthalene | 1,5 Naphthalene disulfonic disodium salt | |
Optical Brighteners | 1 ppb | 0 - 10,000 ppb | Quinine sulphate | |
Phosphate (absorbance) | 1 µg l-1 | 0 - 930 µg l-1 | ||
Phycocyanin (freshwater) | 150 cells ml-1 | 0 - 150,000 cells ml-1 | ||
Phycoerythrin (marine) | 150 cells ml-1 | 0 - 150,000 cells ml-1 | ||
Pyrene tetra sulfonic acid (PTSA) | 0.1 ppb | >10,000 ppb | ||
Rhodamine WT | 0.01 ppb | 0 - 500 ppb | ||
Silicate (absorbance) | 3 µg l-1 | 0 - 3000 µg l-1 | ||
Turbidity | 0.05 NTU | 0 - 1000 NTU |
For extracted chlorophyll measurements using EPA 445, Trilogy automatically calculates the concentration using the filtered and solvent volumes. The turbidity modules use an IRLED with a wavelength of 860nm to meet ISO 7027 standards for turbidity water quality measurements.
Specifications
Power | 100 to 240VAC Universal Power Supply, Output 12VDC 0.84A Max |
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Operating Temperature | 15-40 °C |
Size | 32.82 cm depth, 26.52 cm width, 21.39 height |
Weight | 3.65 kg |
Readout | Direct concentration (µg l-1, ppb etc.) |
Light source and detector | Light emitting diode and photodiode |
Data output | 100% ASCII format through a 9-pin RS-232 serial cable at 9600 baud |
PC operating system | Windows 98 or later |
Further details can be found in the manufacturer's specification sheet.
RRS Discovery Cruise DY086 CTD Bottle Chlorophyll-a Samples
Originator's Protocol for Data Acquisition and Analysis
Chlorophyll-a samples were collected during cruise DY086 between November 12th 2017 and December 19th 2017 to aid in calibrating the fluorometer on the CTD. Samples were obtained from a range of depths using an SBE 911plus Titanium or Stainless Steel CTD unit with 24 10L or 20L Niskin bottles fitted to the rosette sampler respectively. Between 100-250ml of seawater were filtered on GF/F filters for the total samples and polycarbonate 0.2µm, 2µm, and 10µm filters for size fractionated chlorophyll-a.
Chlorophyll-a was extracted in 6ml of 90% acetone after about 24 hours of refrigeration. Measurements were made using a Turner Designs Trilogy fluorometer. Both a Red Turner solid standard and an acetone blank sample were used at the start and end of each set of readings, both of these readings wre used in the Chlorophyll-a calculations seen in the following equation:
Chla = Dilution * (R)adj * (F-blank) * (v/V)
- Dilution = 1
- (R)adj = response factor adjusted for the shift in the solid standard
- blank = acetone blank reading
- v = acetone extracted volume (6ml)
- V = filtered sample volume in ml
BODC Data Processing Procedures
The chlorophyll data were supplied to BODC in an Excel spreadsheet. The data were loaded into BODC's database using established BODC data banking procedures with no changes.
The originator's variables were mapped to appropriate BODC parameter codes as follows:
Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comment |
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Chl-a | mg/m3 | CPHLFLP1 | mg/m3 | - |
Any flags on the originator's data were mapped to the appropriate equivalent BODC flags. Although some bottles were marked misfired by the originator, BODC did not apply any additional flags to the data from these bottles as the data may still be accurate.
The titanium CTD was used for casts 1, 4, 7, 15, 19, 24, 26, and 29.
Project Information
Controls over Ocean Mesopelagic Interior Carbon Storage: COMICS
COMICS is a four-year collaborative research project that aims to quantify the flow of carbon in the ocean?s ?twilight? zone in order to accurately model global climate change. This ?twilight? zone is the part of the ocean between 100m and 1000m below the sea surface, where only a small amount of light from the sun can still penetrate.
By investigating carbon dynamics in the ocean interior, COMICS will help to improve predictions of future global climate change.
The COMICS project is led by the National Oceanography Centre and is a collaboration between the British Antarctic Survey and the universities of Queen Mary London, Liverpool, Oxford and Southampton. The project received funding from the Natural Environmental Research Council and runs between April 2017 and 2021.
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2017-11-21 |
End Date (yyyy-mm-dd) | 2017-11-21 |
Organization Undertaking Activity | National Oceanography Centre, Southampton |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | DY086_CTD_CTD010 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for DY086_CTD_CTD010
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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1321577 | 20.00 | 1 | 1 | 1017.50 | 1018.20 | 1006.40 | Niskin bottle | No problem reported | ||
1321580 | 20.00 | 2 | 2 | 508.90 | 510.30 | 504.10 | Niskin bottle | No problem reported | ||
1321583 | 20.00 | 3 | 3 | 508.70 | 510.20 | 504.90 | Niskin bottle | No problem reported | ||
1321586 | 20.00 | 4 | 4 | 357.90 | 359.30 | 354.70 | Niskin bottle | No problem reported | ||
1321589 | 20.00 | 5 | 5 | 255.90 | 256.30 | 253.70 | Niskin bottle | No problem reported | ||
1321592 | 20.00 | 6 | 6 | 253.90 | 257.40 | 252.60 | Niskin bottle | No problem reported | ||
1321595 | 20.00 | 7 | 7 | 204.00 | 205.20 | 202.30 | Niskin bottle | No problem reported | ||
1321598 | 20.00 | 8 | 8 | 203.30 | 205.80 | 202.70 | Niskin bottle | No problem reported | ||
1321601 | 20.00 | 9 | 9 | 152.90 | 153.90 | 151.70 | Niskin bottle | No problem reported | ||
1321604 | 20.00 | 10 | 10 | 153.60 | 155.20 | 153.60 | Niskin bottle | No problem reported | ||
1321607 | 20.00 | 11 | 11 | 127.60 | 129.30 | 127.90 | Niskin bottle | No problem reported | ||
1321610 | 20.00 | 12 | 12 | 102.10 | 104.30 | 101.80 | Niskin bottle | No problem reported | ||
1321613 | 20.00 | 13 | 13 | 103.30 | 104.50 | 103.40 | Niskin bottle | No problem reported | ||
1321616 | 20.00 | 14 | 14 | 76.30 | 78.90 | 78.00 | Niskin bottle | No problem reported | ||
1321619 | 20.00 | 15 | 15 | 52.40 | 53.10 | 52.40 | Niskin bottle | No problem reported | ||
1321622 | 20.00 | 16 | 16 | 52.20 | 53.40 | 52.10 | Niskin bottle | No problem reported | ||
1321625 | 20.00 | 17 | 17 | 40.20 | 43.20 | 40.60 | Niskin bottle | No problem reported | ||
1321628 | 20.00 | 18 | 18 | 30.50 | 32.90 | 30.60 | Niskin bottle | No problem reported | ||
1321631 | 20.00 | 19 | 19 | 31.50 | 32.80 | 32.30 | Niskin bottle | No problem reported | ||
1321634 | 20.00 | 20 | 20 | 20.20 | 22.60 | 20.50 | Niskin bottle | No problem reported | ||
1321637 | 20.00 | 21 | 21 | 16.60 | 17.10 | 16.80 | Niskin bottle | No problem reported | ||
1321640 | 20.00 | 22 | 22 | 11.20 | 11.90 | 11.40 | Niskin bottle | No problem reported | ||
1321643 | 20.00 | 23 | 23 | 11.50 | 13.00 | 12.00 | Niskin bottle | No problem reported | ||
1321646 | 20.00 | 24 | 24 | 5.60 | 6.90 | 6.60 | 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
Cruise Name | DY086 (COMICS) |
Departure Date | 2017-11-12 |
Arrival Date | 2017-12-19 |
Principal Scientist(s) | Richard Sanders (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 |
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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: DY086_CTD_CTD010
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 |
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1921349 | Water sample data | 2017-11-21 14:30:00 | 52.7015 S, 40.13983 W | RRS Discovery DY086 (COMICS) |