Metadata Report for BODC Series Reference Number 1667891
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 |
|---|---|
| 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
Public domain 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.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
0508S: Discrete Dissolved Inorganic Nutrients Sampling Document
Data originator
Dr George Slesser, Marine Laboratory (MARLAB), Marine Scotland.
Originator's Protocol for Data Acquisition and Analysis
Discrete water samples were taken from Niskin bottles attached to the CTD frame used during the cruise. Bottles were triggered whilst the CTD package was descending through the water column on each cast.
Analysis was performed on unfiltered samples whilst onboard, typically within 10 hours of sample collection. Nutrient concentrations were determined colorimetrically using a QuAAtro autoanalyser. Calibration was carried out relative to stock solutions of nitrite, nitrate and phosphate. Silicate calibration utilised lab-prepared stock solutions. The full methods for nutrient analysis were supplied to BODC by the data originator.
BODC processing
Nutrient samples collected at Extended Ellett Line stations during the cruise were supplied to BODC in an Excel spreadsheet. The nutrient concentrations were supplied together with the approximate (pre-allocated) sampling depths. The raw Sea-Bird files were also supplied. These were used to regenerate bottle firing (.btl) files which could be used to determine precise sampling depths. Nutrient values were merged with the associated information harvested from the Sea-Bird files and loaded to BODC's Oracle relational database.
Contents of data series
| Originator variable | Originator units | Description | BODC parameter code | BODC units | Comments |
|---|---|---|---|---|---|
| NO3 | µg-at/l | Concentration of nitrate+nitrite | NTRZAATX | µmol/l | No unit conversion required |
| PO4 | µg-at/l | Concentration of phosphate | PHOSAATX | µmol/l | No unit conversion required |
| Si | µg-at/l | Concentration of silicate | SLCAAATX | µmol/l | No unit conversion required |
| NH3 | µg-at/l | Concentration of ammonia | AMONAATX | µmol/l | No unit conversion required |
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
| Start Date (yyyy-mm-dd) | 2008-05-23 |
| End Date (yyyy-mm-dd) | Ongoing |
| Organization Undertaking Activity | Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory) |
| Country of Organization | United Kingdom |
| Originator's Data Activity Identifier | 0508S_CTD_321 |
| Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for 0508S_CTD_321
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 200643 | 1 | 1 | 4.20 | 4.90 | 4.50 | unknown | No problem reported | |||
| 200644 | 2 | 2 | 51.10 | 52.40 | 51.30 | unknown | No problem reported | |||
| 200645 | 3 | 3 | 100.80 | 101.70 | 100.30 | unknown | No problem reported | |||
| 200646 | 4 | 4 | 126.30 | 127.70 | 125.80 | unknown | 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 | 0508S |
| Departure Date | 2008-05-06 |
| Arrival Date | 2008-05-25 |
| Principal Scientist(s) | George Slesser (Fisheries Research Services Aberdeen Marine Laboratory) |
| Ship | FRV Scotia |
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: 0508S_CTD_321
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 |
|---|---|---|---|---|
| 1616983 | Water sample data | 2008-05-23 13:16:00 | 56.83383 N, 8.33717 W | FRV Scotia 0508S |
