Metadata Report for BODC Series Reference Number 2003496
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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Time Co-ordinates(UT) |
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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
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 | |
|---|---|---|---|---|
| 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 |
|---|---|
| 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.
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.
Extracted chlorophyll-a measurements from non-toxic underway supply samples collected during AMT23 (JR20131005)
Originator's Protocol for Data Acquisition and Analysis
Samples were taken from the non-toxic underway supply to provide a calibration for the continuous fluorometer measurements. During the cruise 129 samples were collected from the non-toxic underway system and processed for extracted chl-a measurement.
250 ml samples of seawater collected from the non-toxic supply were filtered through 47 mm diameter 0.2 µm polycarbonate filters. The chlorophyll-a was then extracted from the filters with 10 ml 90% acetone for 24 hours while samples were stored in a freezer. The concentrations were then determined fluorometrically.
References Cited
Instrumentation Description
Turner Designs Trilogy fluorometer with a non-acidified chl module (CHL NA #046) fitted
BODC Data Processing Procedures
Data were submitted in an Excel spreadsheet and archived under BODC's accession number BOD130204. Sample metadata (sample ID, Julian day, date, time (GMT), latitude and longitude) were provided and loaded to the database.
BODC parameter codes were assigned to the variable. No unit conversion was necessary as the units the data were supplied in the files matched the units for the parameter codes in the BODC Parameter Dictionary. Data were loaded to the database following established BODC data banking procedures.
A parameter mapping table is provided below.
| Originator's Parameter | Units | Description | BODC Parameter Code | Units | Comments |
|---|---|---|---|---|---|
| Chl-a mean | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >0.2 µm phase] by filtration, acetone extraction and fluorometry | CPHLFLP5 | mg m-3 | Units equivalent |
Data Quality Report
There were no problems reported.
Problem Report
Not relevant to this data set.
Project Information
Oceans 2025 Theme 10, Sustained Observation Activity 1: The Atlantic Meridional Transect (AMT)
The Atlantic Meridional Transect has been operational since 1995 and through the Oceans 2025 programme secures funding for a further five cruises during the period 2007-2012. The AMT programme began in 1995 utilising the passage of the RRS James Clark Ross between the UK and the Falkland Islands southwards in September and northwards in April each year. Prior to Oceans 2025 the AMT programme has completed 18 cruises following this transect in the Atlantic Ocean. This sustained observing system aims to provide basin-scale understanding of the distribution of planktonic communities, their nutrient turnover and biogenic export in the context of hydrographic and biogeochemical provinces of the North and South Atlantic Oceans.
The Atlantic Meridional Transect Programme is an open ocean in situ observing system that will:
- give early warning of any fundamental change in Atlantic ecosystem functionng
- improve forecasts of the future ocean state and associated socio-economic impacts
- provide a "contextual" logistical and scientific infrastructure for independently-funded national and international open ocean biogeochemical and ecological research.
The specific objectives are:
- To collect hydrographic, chemical, ecological and optical data on transects between the UK and the Falkland Islands
- To quantify the nature and causes of ecological and biogeochemical variability in planktonic ecosystems
- To assess the effects of variability in planktonic ecosystems on biogenic export and on air-sea exchange of radiatively active gases
The measurements taken and experiments carried out on the AMT cruises will be closely linked to Themes 2 and 5. The planned cruise track also allows for the AMT data to be used in providing spatial context to the Sustained Observation Activities at the Porcupine Abyssal Plain Ocean Observatory (SO2) and the Western Channel Observatory (SO10).
More detailed information on this Work Package is available at pages 6 - 9 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 | JR20131005 (AMT23, JR300) |
| Departure Date | 2013-10-01 |
| Arrival Date | 2013-11-11 |
| Principal Scientist(s) | Mikhail V Zubkov (National Oceanography Centre, Southampton) |
| 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 |
