Metadata Report for BODC Series Reference Number 2049156
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
Metrohm 888 Titrando
A modular pentiometric titrator for dynamic, monotonic and set endpoint titrations. The instrument consists of an intergrated buret, rod or magnetic stirrer and dosing system. Operation is carried out by means of a touch-sensitive display or with high-performance PC software.
Specifications
The 888 Titrando has one galvanically isolated measuring interface. The measuring cycle is 100 ms for all measuring modes.
Potentiometric pH measurement | Measuring range: -13 - +20 pH Accuracy: ±0.003 pH |
Potentiometric voltage measurement | Measuring range: -1,200 - +1,200 mV Accuracy: ±0.2 mV |
Temperature (Pt1000) | Measuring range: -150 - +250 °C Accuracy: ±0.2 °C |
Temperature (NTC) | Measuring range: -5 - +250 °C Accuracy: ±0.6 °C |
Voltametric measurement with selectable polarization current | Measuring range: -1,200 - +1,200 mV Accuracy: ±0.2 mV |
Amperometric measurement with selectable polarization voltage | Measuring range: -120 - +120 µA |
Dosing element | Exchange unit |
Steps per cylinder volume | 20,000 |
Operation, dialog | Touch Control or tiamoTM |
Stirrer, titration stand | 801 Stirrer (magnetic) or 802 Stirrer (rod) with 804 Ti Stand or 803 Ti Stand (KF) |
Connection of balance, printer, USB keyboard, USB mouse, USB stick and barcode reader | Via 2 USB Slave Ports, RS-232/USB-Box (option) |
Temperature sensor | Pt 1000 or NTC |
Connections for stirrers and intelligent dosing elements | 4 MSB connections (Metrohm Serial Bus, Daisy Chain) |
For more information about this model see the manufactures data sheet - Metrohm 888 Titrando.
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.
Dissolved Oxygen data for Cruise JR15007
Originator's Protocol for Data Acquisition and Analysis
Sampling Collection
Niskin bottles were deployed at 35 locations in the Mid Atlantic, to a range of depths. Oxygen samples were the first drawn from the Niskin bottles as soon as the rosette was secured on deck. 125 ml optically-clear glass oxygen bottles were calibrated for volume and prepared to store the samples. The glass bottles were triple-rinsed and stored full with Milli-Q. Tygon tubing was used to fill the bottles from the Niskin, the bottles were overflowed for 20 seconds to ensure the sample contained no bubbles. Temperature of each sample was taken immediately then the sample was fixed with 1 ml manganese sulphate (3 M) and 1 ml alkaline iodide and shaken vigorously for 20 seconds prior to storage, which occurred approximately 15 minutes later. Samples were stored upright under water in a dark 60 l container until the precipitate had settled.
Sample Analysis
Samples were analysed for dissolved oxygen concentration onboard using the modified Winkler method (Carpenter, 1965) and a PC-controlled potentiometric titration system (Metrohm Titrando 888). The samples were analysed between 4 hours and 4 days of collection. Prior to analysis 1 ml sulphuric acid (10 N) was added to each sample to dissolve the precipitate. Reagent blanks were run using 0.025 N potassium iodate (1 aliquot) and sodium thiosulphate titrant (~ 0.18 N). Each of these was performed in triplicate (at minimum) prior to sample analysis each day. Mean reagent blank was 0.00174 ± 0.016 mL over the course of the cruise and mean thiosulphate normality was 0.3070 ± 0.0002 N. Lab temperature was monitored throughout analysis. Calculation of dissolved oxygen concentration was according to HOT protocol (Karl et al., 1990) and Grasshoff (1983). Samples were analysed to produce a dissolved oxygen concentration in umol/l.
References Cited
Carpenter, J.H. (1965). The Chesapeake Bay Institute Technique for the Winkler oxygen method. Limnol. Oceanogr., 10, 141-143.
Karl, D.M., Winn, C. D., Hebel, D.V.W. and Letelier, R. 1990. Hawaii Ocean Time-series (HOT) program field and laboratory protocols.
Grasshoff, K. Ehrhardt, M, and K. Kremling. 1983. Methods of Seawater Analysis. Grasshoff, Ehrhardt and Kremling, eds. Verlag Chemie GmbH. 419 pp.
JR15007 Cruise report
Further information can be found in the JR15007 Cruise report.
BODC Data Processing Procedures
Data were received in an excel file and loaded into the BODC database using established BODC data banking procedures. A parameter mapping table is provided below:
Originator's Variable | Originator's Units | BODC Parameter Code | BODC Unit | Comments |
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Dissolved Oxygen (D.O.) | umol/l | DOXYWITX | umol/l | - |
D.O. Coefficient of Variance (CV) | % | SDOXWITX | umol/l | Converted from CV to standard deviation (S.D.). SD = (CV * mean)/100. |
Project Information
A nutrient and carbon pump over mid-ocean ridges (RidgeMix)
RidgeMix is a five year (August 2014 to February 2019) research programme which received funding from the Natural Environment Research Council (NERC). The aim of the programme was to address the problem of how deep nutrients are transported into the surface waters in mid-latitudes, by testing a new view: tides passing over the mid-Atlantic ridge generate enhanced turbulence and mixing, which in turn provides a nutrient supply to the upper thermocline waters. These nutrients are then transported horizontally along density surfaces over the western side of the basin, probably being swept along the Gulf Stream and eventually passing into the winter mixed surface layer. When this surface layer shallows and warms in spring, the nutrients are then available to the phytoplankton.
Fieldwork involved collecting measurements of the turbulence and nutrient concentrations over and adjacent to the Mid-Atlantic Ridge, using a novel long-term moored array of instruments along the ridge, deployed over a five-week research cruise. Sampling was done sufficiently quickly to resolve tidal changes in currents and mixing over the ridge. A second component of the fieldwork will use computer models of circulation in the Atlantic to explore the wider implications of the fieldwork observations, to determine whether or not mixing over the mid-Atlantic ridge really does provide enough nutrients to explain the phytoplankton production in the mid-latitude North Atlantic.
RidgeMix was a collaborative project involving five organisations, of which three were UK based and two were US based. The project was led by the Professor Jonathan Sharples, University of Liverpool, Earth, Ocean and Ecological Sciences. Collaborators were:
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2016-06-03 |
End Date (yyyy-mm-dd) | Ongoing |
Organization Undertaking Activity | National Oceanography Centre, Liverpool |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | JR15007_CTD_CTD_003 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for JR15007_CTD_CTD_003
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 |
---|---|---|---|---|---|---|---|---|---|---|
1345379 | 20.00 | 1 | 1 | 3575.00 | Niskin bottle | No problem reported | ||||
1345382 | 20.00 | 2 | 2 | 3300.00 | Niskin bottle | No problem reported | ||||
1345385 | 20.00 | 3 | 3 | 3000.00 | Niskin bottle | No problem reported | ||||
1345388 | 20.00 | 4 | 4 | 2750.00 | Niskin bottle | No problem reported | ||||
1345391 | 20.00 | 5 | 5 | 2500.00 | Niskin bottle | No problem reported | ||||
1345394 | 20.00 | 6 | 6 | 2250.00 | Niskin bottle | No problem reported | ||||
1345397 | 20.00 | 7 | 7 | 2000.00 | Niskin bottle | No problem reported | ||||
1345400 | 20.00 | 8 | 8 | 1750.00 | Niskin bottle | No problem reported | ||||
1345403 | 20.00 | 9 | 9 | 1500.00 | Niskin bottle | No problem reported | ||||
1345406 | 20.00 | 10 | 10 | 1250.00 | Niskin bottle | No problem reported | ||||
1345409 | 20.00 | 11 | 11 | 1000.00 | Niskin bottle | No problem reported | ||||
1345412 | 20.00 | 12 | 12 | 900.00 | Niskin bottle | No problem reported | ||||
1345415 | 20.00 | 13 | 13 | 800.00 | Niskin bottle | No problem reported | ||||
1345418 | 20.00 | 14 | 14 | 750.00 | Niskin bottle | No problem reported | ||||
1345421 | 20.00 | 15 | 15 | 700.00 | Niskin bottle | No problem reported | ||||
1345424 | 20.00 | 16 | 16 | 600.00 | Niskin bottle | No problem reported | ||||
1345427 | 20.00 | 17 | 17 | 500.00 | Niskin bottle | No problem reported | ||||
1345430 | 20.00 | 18 | 18 | 400.00 | Niskin bottle | No problem reported | ||||
1345433 | 20.00 | 19 | 19 | 400.00 | Niskin bottle | No problem reported | ||||
1345436 | 20.00 | 20 | 20 | 300.00 | Niskin bottle | No problem reported | ||||
1345439 | 20.00 | 21 | 21 | 200.00 | Niskin bottle | No problem reported | ||||
1345442 | 20.00 | 22 | 22 | 100.00 | Niskin bottle | No problem reported | ||||
1345445 | 20.00 | 23 | 23 | 55.00 | Niskin bottle | No problem reported | ||||
1345448 | 20.00 | 24 | 24 | 4.00 | 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
Cruise Name | JR15007 |
Departure Date | 2016-05-25 |
Arrival Date | 2016-07-10 |
Principal Scientist(s) | Jonathan Sharples (National Oceanography Centre, Liverpool) |
Ship | RRS James Clark Ross |
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: JR15007_CTD_CTD_003
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 |
---|---|---|---|---|
1987385 | Water sample data | 2016-06-03 15:06:00 | 36.25208 N, 39.00776 W | RRS James Clark Ross JR15007 |
2047254 | Water sample data | 2016-06-03 15:06:10 | 36.25208 N, 39.00776 W | RRS James Clark Ross JR15007 |
2138240 | Water sample data | 2016-06-03 15:06:10 | 36.25208 N, 39.00776 W | RRS James Clark Ross JR15007 |