Metadata Report for BODC Series Reference Number 2099558
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
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Parameters |
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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
Lachat QuikChem 8500 flow injection analyzer (FIA) and Ion Chromatography (IC) system
The Lachat QuikChem 8500 can operate FIA and IC simultaneously and independently on the same instrument platform. FIA and IC are complementary analytical techniques that are commonly used in the same laboratory.
Instrument includes - sampler, dilutor, sampling pump, electronics unit, and data station.
Flow injection analysis is ideally suited for processing relatively large numbers of samples. Ion Chromatography adds the power to profile samples for a class of ionic species.
FIA Productivity Characteristics
- Fast Startup - ~5 minutes
- Rapid Analysis - 20 to 60 seconds is typical
- High Sample Throughput - 60 to 120 samples per hour is typical
- Broad Working Range - Parts per trillion to percents
- Complete Baseline Resolution - No carryover between samples
- Wide Dynamic Range - 2 to 3 decades is typical
- Fast Shutdown - ~5 minutes
- Rapid Method Changeover - ~10 minutes
New FIA Features
- Run up to 5 channels for high productivity analysis or dedicated operation.
- New 2-cm flow cell methods allow more signal for detection at lower levels.
- Run Omnion 3.0 software on Windows XP, Vista, or Windows 7 operating systems.
- Interface Omnion software in multiple languages - including Spanish, German, French, Portuguese, and Italian.
For more information about this model see the manufactures data sheet - Lachat QuikChem 8500.
Non-toxic (underway) sea water supply
A source of uncontaminated near-surface (commonly 3 to 7 m) seawater pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the non-toxic supply. The system is also referred to as the underway supply.
JC086 discrete dissolved inorganic nutrients sampling document
Originator's protocol for data acquisition and analysis
The following information contains extracts from the JC086 cruise report.
Water samples were drawn from the CTD rosette bottles deployed during the cruise for ammonia, phosphate, silicate, nitrate and nitrite, with the majority of the sampling effort concentrated in areas of the water column corresponding with changes in water mass. Samples were also drawn from the ships non-toxic water supply.
SAMS Analysis
Samples were collected in 125 ml acid cleaned polythene bottles directly from CTD spigots without the use of a tube. Samples were stored in a fridge prior to analysis. The analysis was carried out within 24 hours of sample collection with a Lachat Quick Chem 8500 flow injection autoanalyser using the manufacturer's recommended methods.
Samples were measured in triplicate to identify instrument precision. A stock mixed standard was prepared in deionized water with subsequent dilutions made in OSIL Low Nutrient Sea Water using the instrument auto-dilutor facility. Five standard concentrations and a blank were run in all cases and new standards were prepared every 48 hours. Using standards prepared in Low Nutrient Sea Water removes the need to do a separate salt correction. Three standard concentration ranges were prepared for the non-toxic and CTD samples depending on expected nutrient concentration.
NOC Analysis
Samples were taken in 30ml plastic vials which were filled up to 2/3 of the total volume to allow expansion of water. Samples were labelled and stored in the freezer until analysis. The analysis was carried out at NOCS using a Quattro nutrient analyzer system.
BODC data processing procedures
Data from SAMS were provided in Mstar format and the data from NOC in .CSV format. The data files were converted to Microsoft Excel format and loaded into BODC's ocean database under the ORACLE Relational Database Management System without modification. Data that were considered unrealistic were flagged suspect. Metadata collected from the various data files were favoured by BODC over the metadata recorded in the cruise report logs in the JC086 cruise report.
Content of data series
| Originator's Parameter | Unit | Description | BODC Parameter code | BODC Unit | Comments |
|---|---|---|---|---|---|
| CTD bottle and discrete underway phosphate | µM | Concentration of phosphate in the water column by colorimetric autoanalysis (unfiltered) | PHOSAATX | µM | N/A |
| CTD bottle and discrete underway silicate | µM | Concentration of silicate in the water column by colorimetric autoanalysis (unfiltered) | SLCAAATX | µM | N/A |
| CTD bottle and discrete underway nitrate and nitrite | µM | Concentration of nitrate and nitrite in the water column by colorimetric autoanalysis (unfiltered) | NTRZAATX | µM | N/A |
Data quality report
BODC applied flags to negative silicate values at CTD cast 59 bottle 13 and CTD cast 64 bottle 17.
No problems were reported and no significant issues encountered during BODC data banking procedures.
References cited
Griffiths C. R. et al., 2013. RRS James Cook Cruise JC086, 06 May 2013 - 26 May 2013. Govan to Govan, Scotland - the Extended Ellett Line. Scottish Association for Marine Science. (Scottish Marine Institute, Oban).
Available - Cruise JC086 Internal Report
Hartman, S., J. L. Menzel and Achterberg.E., 2014. Discrete Carbon Dioxide Data Obtained During the R/V James Cook EEL_2013_JC86 Cruise Along Extended Ellett Line. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee. doi: 10.3334/CDIAC/OTG.CLIVAR_EEL_2013_JC86
The doi referenced was created prior to BODC receiving the data and is a subset of the dataset (only NOC nutrients).
Project Information
Oceans 2025 Theme 10, Sustained Observation Activity 4: The Extended Ellett Line
The Ellett Line (begun in 1975 and since 1996 the Extended Ellett Line from Scotland to Iceland) crosses important north Atlantic Meridional Overturning Circulation (MOC) components and thus provides an additional contribution to understanding the north Atlantic response to climate change. Sustained Observation Activity (SO) 4 will repeat this section annually collecting a wide variety of physical and biogeochemical measurements, and will, to enhance the time variable component, make use of Argo floats and gliders. SO 4 will be implemented by physical, biological and chemical scientists at the National Oceanography Centre, Southampton (NOCS) and the Scottish Association for Marine Science (SAMS).
SO 4 formally contributes to the Department for Environment, Food and Rural Affairs (DEFRA)-funded Marine Environmental Change Network (MECN). Established in 2002 to coordinate and promote the collection and utilisation of marine time-series and long-term data sets, the goal of the network is to use long-term marine environmental data from around the British Isles and Ireland to separate natural fluctuations from global, regional and local anthropogenic impacts.
The specific deliverables for SO 4 are:
- A time series of the evolution of the hydrography of the northeast Atlantic, together with a more formal understanding of the causes of any changes observed
- An archived data set available to the international community via the British Oceanographic Data Centre (BODC)
- A platform for further scientific research
More detailed information on this Work Package is available at pages 15 - 16 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10
Weblink: http://www.oceans2025.org/
Data Activity or Cruise Information
Cruise
| Cruise Name | JC086 |
| Departure Date | 2013-05-06 |
| Arrival Date | 2013-05-26 |
| Principal Scientist(s) | Colin R Griffiths (Scottish Association for Marine Science) |
| Ship | RRS James Cook |
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 |
