Metadata Report for BODC Series Reference Number 1918968
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
Turner Designs 10AU Field Fluorometer
The Turner Designs 10AU is designed for continuous-flow monitoring or discrete sample analyses of fluorescent species. A variety of optical kits with appropriate filters and lamps are available for a wide range of applications. Individual filters and lamps are also available for customised applications.
Standard optical kits include those for chlorophyll-a (extracted and/or in vivo), phycocyanin, phycoerythrin, CDOM, ammonium, rhodamine and fluorescein dye tracing, crude oil, refined oil, histamine and optical brighteners.
The instrument's light source is a 4 watt lamp and the detector is a photomultiplier tube with a standard detection range of 300-650 nm. A red-sensitive version with a detetion range of 185-970 nm is also available.
Specifications
| Operating temperature | 0 to 55°C |
| Detector | PhotoMultiplier Tube 300 to 650 nm (standard) 185 to 870 nm (Red) |
| Detection Limits: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0.025 µg L-1 0.01 ppb (in potable water) 0.01 ppb (in potable water) |
| Linear range: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0 to 250µg L-1 0 to 250 ppb 0 to 250 ppb |
Further details can be found in the manufacturer's specification sheet.
WETLabs C-Star transmissometer
This instrument is designed to measure beam transmittance by submersion or with an optional flow tube for pumped applications. It can be used in profiles, moorings or as part of an underway system.
Two models are available, a 25 cm pathlength, which can be built in aluminum or co-polymer, and a 10 cm pathlength with a plastic housing. Both have an analog output, but a digital model is also available.
This instrument has been updated to provide a high resolution RS232 data output, while maintaining the same design and characteristics.
Specifications
| Pathlength | 10 or 25 cm |
| Wavelength | 370, 470, 530 or 660 nm |
| Bandwidth | ~ 20 nm for wavelengths of 470, 530 and 660 nm ~ 10 to 12 nm for a wavelength of 370 nm |
| Temperature error | 0.02 % full scale °C-1 |
| Temperature range | 0 to 30°C |
| Rated depth | 600 m (plastic housing) 6000 m (aluminum housing) |
Further details are available in the manufacturer's specification sheet or user guide.
BAS Long Term and Monitoring Survey James Clark Ross Cruise JR20101221 (JR245, JR246, JR247) Underway Surface Hydrography Instrumentation Document
Surface hydrography was collected with the instruments presented in the table below. All instruments were located on the ship's preparation laboratory.
| Manufacturer | Model | Sensor | Serial number | Last calibration date |
| Sea Bird Electronics | SBE45 | Thermosalinograph | 4524698-0016 | 2004-03-05 |
| WetLabs | C-Star | Transmissometer | ||
| Chelsea Technologies | 10 AU-005 | Fluorometer | 6465RTX | |
| Litre Meter | Flow meter | 45/59462 |
Litre Meter flow meter
A flow meter used to monitor water flow rates for pumped systems such as ships' continuous seawater supplies.
SeaBird MicroTSG Thermosalinograph SBE 45
The SBE45 MicroTSG is an externally powered instrument designed for shipboard measurement of temperature and conductivity of pumped near-surface water samples. The instrument can also compute salinity and sound velocity internally.
The MicroTSG comprises a platinum-electrode glass conductivity cell and a stable, pressure-protected thermistor temperature sensor. It also contains an RS-232 port for appending the output of a remote temperature sensor, allowing for direct measurement of sea surface temperature.
The instrument can operate in Polled, Autonomous and Serial Line Sync sampling modes:
- Polled sampling: the instrument takes one sample on command
- Autonomous sampling: the instrument samples at preprogrammed intervals and does not enter quiescence (sleep) state between samples
- Serial Line Sync: a pulse on the serial line causes the instrument to wake up, sample and re-enter quiescent state automatically
Specifications
| Conductivity | Temperature | Salinity | |
|---|---|---|---|
| Range | 0 to 7 Sm-1 | -5 to 35°C | |
| Initial accuracy | 0.0003 Sm-1 | 0.002°C | 0.005 (typical) |
| Resolution | 0.00001 Sm-1 | 0.0001°C | 0.0002 (typical) |
| Typical stability (per month) | 0.0003 Sm-1 | 0.0002°C | 0.003 (typical) |
Further details can be found in the manufacturer's specification sheet.
BAS Long Term and Monitoring Survey James Clark Ross Cruise JR20070418 (JR167, JR168) Underway Surface Hydrography Document
Content of data series
| Parameter | Units | Parameter code | Comments |
|---|---|---|---|
| Latitude | Degrees (+ve N) | ALATGP01 | |
| Longitude | Degrees (+ve E) | ALONGP01 | |
| Salinity | Dimensioneless | PSALSU01 | |
| Conductivity | m s-1 | CNDCSG01 | |
| Temperature | °C | TEMPSU01 | Sea surface, remote |
| Temperature | °C | TEMPHU01 | Sea surface, hull sensor |
| Chlorophyll | µg l-1 | CPHLUMTF | |
| Sound Velocity | m s-1 | SVELSG01 | |
| Flow Rate | l min-1 | INFLTF01 |
Instrumentation
The sea surface hydrographical suite of sensors was fed by the pumped-seawater, non-toxic supply. The seawater intake was located approximately 7 m below the sea surface. The SBE 38 sea surface temperature sensor was located towards the hull near the seawater intake. All other sensors were located in the clean seawater laboratory on the main deck, directly above the intake pipe.
| Sensor | Manufacturer | Main role |
| SBE45 CTD | SeaBird Electronics | Surface hydrography |
| 10-AU Fluorometer | Turner Designs | Chlorophyll fluorescence |
| Flow meter | Flow rate | |
| Hull temperature sensor | Temperature sensor |
Data Processing Procedures
Originator's Data Processing
The originator did no process the data during the cruise, the only procedures implemented throughout the cruise consisted of data retrieval from the previous 24h and logging those into sub directories on the ship's intranet system.
The sea surface hydrography measurements were performed by a number of instruments connected to the ship's flow through system and a temperature sensor located near the flow through intake, at the hull, at 7 m depth.
The originator sent one file containing the sea surface data: Surface temperature by the thermosalinograph and hull sensor, chlorophyll, salinity, conductivity, sound velocity and pump flow rate.
The processing procedures carried out by the originator include:
- check for duplicate dates and times
- standardising time
- check for gaps in data
- check data against defined tresholds
- flagging
- unit conversion
| Filename | Content description | Format | Interval | Start date/time (UTC) | E nd date/time (UTC) | Comments |
| jr179_ocl_exactsec | Meteorology and Surface hydrography | txt | 5s | 18/04/2007 13:57:13 | 14/05/2007 02:53:10 | Data processed by originator |
BODC Data Processing
All sea surface hydrography parameters, were transferred to internal QXF format and matched against BODC codes, as presented in the table below. There was no need to apply unit conversions as the originator's units were similar to the units described on the BODC parameter dictionary.
BODC processing procedures included loading of data and reduction through averaging, visual screening and flagging of anomalous values.
The originator's variables were mapped to appropriate BODC parameter codes as follows:
jr179_ocl_exactsec
| Originator's variable | Originator's units | Description | BODC Code | BODC Units | Comments |
| ThermoSalTemp | degrees C | Temperature of the water body by thermosalinograph and NO verification against independent measurements | TEMPSU01 | degrees C | Remote sensor |
| SSTemp | degrees C | Temperature of the water body by thermosalinograph hull sensor and NO verification against independent measurements | TEMPHU01 | degrees C | Hull sensor |
| Chloro | µg l-1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate phase] by through-flow fluorometer plumbed into non-toxic supply and manufacturer's calibration applied | CPHLUMTF | mg m-3 | Equivalent units |
| Salinity | - | Practical salinity of the water body by thermosalinograph and computation using UNESCO 1983 algorithm and NO calibration against independent measurements | PSALSU01 | dimensionless | |
| Cond | s m-1 | Electrical conductivity of the water body by thermosalinograph | CNDCSG01 | s m-1 | |
| Velocity | m s-1 | Sound velocity in the water body by thermosalinograph and computation from temperature and salinity by unspecified algorithm | SVELSG01 | m s-1 | |
| flow_rate | l min-1 | Flow rate through instrument | INFLTF01 | l min-1 |
Surface hydrography data were screened and N flags applied to absent data values.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20101221 (JR245, JR246, JR247) |
| Departure Date | 2010-12-21 |
| Arrival Date | 2011-01-19 |
| Principal Scientist(s) | Sophie Fielding (British Antarctic Survey) |
| 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 |
