Metadata Report for BODC Series Reference Number 1266637
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
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
PO311 Discrete CTD Nutrients Sampling Document
Originator's Protocol for Data Acquisition and Analysis
The FS Poseidon PO311 cruise departed on the 29 April 2004 from Santa Cruz de Tenerife, Spain and returned on the 24 May 2004. The cruise set out to test the hypothesis that: The supply of, and the interaction between iron and phosphorus control biological activity and fluxes in the subtropical North Atlantic.
Sample collection
Water samples were collected from a subset of CTD profiles. Samples were generally collected from 8 standard depths determined by light levels appropriate to production rate experiments.
Sample analysis
A total of 41 CTD casts were analysed for nutrients: nitrate, nitrite, phosphate and silicate using a Technicon AAII, five channel segmented flow autoanalyser within two hours of collection. Phosphate and silicate were determined according to (Kirkwood, 1989), nitrate and nitrite according to (Brewer and Riley, 1965) and (Grasshoff, 1976) respectively.
Additional analyses were undertaken when required for standards concentration confirmation and in-situ deck incubations.
BODC Data Processing Procedures
Discrete nutrient samples were provided to BODC in Excel format. BODC extracted the data and merged with information from the associated Sea-Bird .btl files (also provided). These data were loaded to BODC's ocean database under the ORACLE Relational Database Management System. Data that were considered unrealistic were flagged suspect.
Samples in the database with a flag of "<" had concentrations below the specified detection limits. For nitrate and nitrite this was 0.01 µM and for phosphate this was 0.02 µM. There were no values below detection for silicate.
For any one experiment up to four CTDs were used to collect the water by targeting different depths for water collection. The original file only listed the possible CTDs for each experiment. BODC therefore matched as best as possible to the correct CTD and niskin number by using depth as a reference. Where duplicate depths were targeted, the bottle that fired first has been chosen.
For CTD cast 014, there was a large depth discrepancy. The Originator supplied a depth of 110 m and this has been linked to a firing depth of 93 m which was the closest firing depth.
No other discrepancies were found between the Originator's metadata and the metadata held centrally in the database.
Content of data series
The Originator's variables were mapped to appropriate BODC parameter codes as follows:
| Originator's Parameter | Unit | Description | BODC Parameter code | BODC Unit | Comments |
|---|---|---|---|---|---|
| Nitrate + Nitrite | Micromoles per litre | Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis | NTRZAATX | Micromoles per litre | No unit conversion necessary |
| Nitrite | Micromoles per litre | Concentration of nitrite {NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis | NTRIAATX | Micromoles per litre | No unit conversion necessary |
| Phosphate | Micromoles per litre | Concentration of phosphate {PO4} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis | PHOSAATX | Micromoles per litre | No unit conversion necessary |
| Silicate | Micromoles per litre | Concentration of silicate {SiO4} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis | SLCAAATX | Micromoles per litre | No unit conversion necessary |
References
Brewer P.G. and Riley J.P., 1965. The automatic determination of nitrate in sea water. Deep-Sea Research, 12, 765-772.
Kirkwood D.S., 1989. Simultaneous determination of selected nutrients in seawater. ICES CM1989/C:29, 12pp.
Grasshoff K., 1976. Methods of seawater analysis. Verlag Chemie, Weiheim: 317 pp.
Rees A. et al., 2004. 'Plymouth Marine Laboratory Core cruise 2004 Phosphate and Iron Addition Experiment (FeeP)'. Cruise Report Plymouth Marine Laboratory.
Project Information
FeeP - Phosphate and Iron Addition Experiment
Who funded the programme?
The Natural Environment Research Council (NERC).
Who was involved in the programme?
The programme was a collaboration lead by Plymouth Marine Laboratory (PML) and involved scientists from the National Institute of Water and Atmospheric Research, New Zealand, Laboratoire Arago, France and the University of East Anglia.
What was the programme about?
The programme was a two ship exercise using RRS Charles Darwin and RV Pseidon to investigate the hypothesis that:
"The supply of, and interaction between, iron and phosphorus control biological activity and fluxes in the subtropical North Atlantic."
When was the programme active?
The project was carried out in 2004.
Brief summary of the programme fieldwork/data
An experimental area in international waters to the west of the Canary Islands was selected following an intense period of vertical and horizontal mapping by the Charles Darwin. Using SF6 as a tracer for amended waters, two separate experiments were performed: The first (5th - 15th May) involved the addition of 20 tonnes of anhydrous monosodium phosphate at 10 m depth over an area of approximately 25 km2, centered at 27.8 oN 23.3 oW. The second experiment was conducted following a mid-cruise return by the Poseidon to Tenerife between 16th May and 22nd May, at 27.5 oN 22.5 oW, when 5 tonnes of acidified iron sulphate were added over the first 12 hours, then following a brief recovery period, 20 tonnes of phosphate added over the top of the iron.
Measurements of nutrient chemistry, gas exchange and biological activity were monitored prior to and after deployment (IN stations) of the fertilised patches relative to several (OUT) control stations.
Data Activity or Cruise Information
Data Activity
| Start Date (yyyy-mm-dd) | 2004-05-06 |
| End Date (yyyy-mm-dd) | 2004-05-06 |
| Organization Undertaking Activity | Plymouth Marine Laboratory |
| Country of Organization | United Kingdom |
| Originator's Data Activity Identifier | PO311_CTD_CTD_023 |
| Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for PO311_CTD_CTD_023
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 173050 | 1 | 1 | 139.70 | 140.00 | 139.20 | unknown | No problem reported | |||
| 173051 | 2 | 2 | 139.50 | 140.10 | 139.20 | unknown | No problem reported | |||
| 173052 | 3 | 3 | 139.80 | 140.00 | 139.30 | unknown | No problem reported | |||
| 173053 | 4 | 4 | 65.20 | 65.60 | 65.30 | unknown | No problem reported | |||
| 173054 | 5 | 5 | 65.30 | 65.60 | 65.40 | unknown | No problem reported | |||
| 173055 | 6 | 6 | 40.70 | 41.00 | 40.90 | unknown | No problem reported | |||
| 173056 | 7 | 7 | 40.70 | 41.50 | 41.20 | unknown | No problem reported | |||
| 173057 | 8 | 8 | 40.00 | 40.70 | 40.40 | unknown | No problem reported | |||
| 173058 | 9 | 9 | 40.70 | 41.40 | 41.10 | unknown | No problem reported | |||
| 173059 | 10 | 10 | 41.50 | 41.90 | 41.80 | unknown | No problem reported | |||
| 173060 | 11 | 11 | 40.50 | 41.40 | 41.00 | unknown | No problem reported | |||
| 173061 | 12 | 12 | 40.30 | 41.00 | 40.70 | 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.
Cruise
| Cruise Name | PO311 |
| Departure Date | 2004-04-29 |
| Arrival Date | 2004-05-24 |
| Principal Scientist(s) | Andrew Rees (Plymouth Marine Laboratory) |
| Ship | FS Poseidon |
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 |
