Metadata Report for BODC Series Reference Number 1174452
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
Quality report for James Clark Ross cruise JR20120207 (JR255B, JR259, JR275) XBT data
All casts were screened and M flags applied to cycles where anomalous data were identified in TEMPET01 and SVELCV01.
| Series reference | Cycles | Comments |
| 49400 | 1-2, 957 | Sensor stabilising to water temperature, suspect values |
| 49500 | 1-3 | Sensor stabilising to water temperature |
| 49600 | 1-3 | Sensor stabilising to water temperature |
| 49700 | 1-3, 2007-2907 | First cycles probe is stabilising, suspect values |
| 49800 | 1-2 | Sensor stabilising to water temperature |
| 49900 | 1-2, 2597-2907 | First cycles probe is stabilising, suspect values |
| 50000 | 1-3 | Sensor stabilising to water temperature |
| 50100 | 1, 814-2907 | First cycles probe is stabilising, suspect values |
| 50200 | 1, 1372-2907 | First cycles probe is stabilising, suspect values |
| 50300 | 1 | Sensor stabilising to water temperature |
| 50400 | 1-2 | Sensor stabilising to water temperature |
| 50500 | 1-3 | Sensor stabilising to water temperature |
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
Instrument description
Lockheed Martin Sippican T-5 XBT Probe
The Expendable Bathythermograph system uses a sea water ground. As soon as an electrode within the nose of the expendable probe makes contact with the water, the circuit is complete and temperature or sound velocity data can be telemetered to the ship-board data processing equipment. The T-5 XBT Probe can be used within a maximum depth of 1830 m, with a rated ship speed of 6 knots and has a vertical resolution of 65 cm.
Manufacturer specifications can be found here
BODC processing document for XBT data
BODC Processing
The files were sent to BODC in .EDF format, which can be opened with a text editor. No processing was carried out at BODC.
The files were converted to BODC internal format (QXF) using BODC established procedures. There was no need to apply unit conversions as the originator's units were equivalent to the units stored on BODC's vocabulary dictionary.
The following table shows how the variables within the originator's files were mapped to appropriate BODC parameter codes:
| Originator's Parameter Name | Units | Description | BODC Parameter Code | Units |
|---|---|---|---|---|
| Depth | m | Depth below surface of the water body by computation from probe free-fall time using unspecified algorithm | DEPHCV01 | m |
| Temperature | °C | Temperature of the water body by expendable bathythermograph (XBT) | TEMPET01 | °C |
| Sound Velocity | m s-1 | Sound velocity in the water body by computation from temperature and salinity by unspecified algorithm | SVELCV01 | m s-1 |
Reformatted XBT data were visualised using the in-house graphical editor EDSERPLO. Quality control flags were applied to data as necessary.
Originator's processing document for JR20120207 (JR255B, JR259, JR275) XBT data
The profiles were obtained with T5 Sippican probes launched from the ship's side.
A total of 12 expendable bathymetry thermographs (XBT) were launched, at pre-defined positions on cruise JR20120207 (JR25BB, JR259, JR275) whilst the ship was sailing. Data were transferred to a PC via a USB interface that provided the communication with the XBT launcher.
The data were obtained with T5 Sippican probes and were not processed or calibrated by the originator.
Project Information
Environmental Change and Evolution
Introduction
The Environmental Change and Evolution programme is a British Antarctic Survey (BAS) core quinquennial research programme, funded by the Natural Environment Research Council (NERC), that started in 2009. It contributes to the NERC's Earth System Science, Biodiversity, Natural Hazards and Climate Systems Themes, addressing, in particular, the Earth System Science high level challenge to understand evolution of life and the planet; the Earth System Science sub-challenge on understanding cryospheric change and its interaction with the Earth System; and the Biodiversity challenge to develop new tools and techniques to describe biodiversity and its function.
This programme will focus on key aspects in the polar regions of geological and ice-sheet structure, marine and terrestrial biodiversity, and natural complexity, that influence the unique role of the polar regions in environmental change and evolution. The tools and instruments include molecular, morphological aerogeophysical (e.g radar, gravity, magnetics) and mathematical techniques, and biological and geological methods which will cover a wide range of data, from biological populations to hydrology, topography and modelling.
The main objectives are:
- To apply and develop appropriate mathematical methods and models for analysing complex natural systems
- To explain how evolutionary and past processes formed present polar biogeography and biodiversity
- To determine continental structure beneath ice sheets and assess how it controls ice-sheet evolution and behaviour
- To survey poorly-known areas underneath the polar ice sheets, in the deep sea, and at the edge of the atmosphere, and compile geological, geophysical and satellite-derived data to generate digital maps of key areas of British Antarctic Territory
Through this programme BAS will develop partnerships and links with several institutions and research programmes, such as:
- Geophysical Exploration of Subglacial Lake Ellsworth
- Super Dual Aurora Radar Network (SuperDARN)
- General Bathymetric Chart of the oceans (GEBCO)
- International Bathymetric Chart of the Southern Ocean (IBCSO)
- Antarctic Digital Magnetic Anomaly Project (ADMAP)
- Antarctic sub-ice topography map (BEDMAP)
- OneGeology (digital map of the world)
- Evolution and Biodiversity in Antarctica programme by the Scientific Committee on Antarctic Research (SCAR-EBA)
- Marine biodiversity Information Network by the Scientific Committee on Antarctic Research (SCAR-MarBIN)
- Census of Marine Life (CoML) and Census of Antarctic Marine life (CAML)
- Antarctic Climate Evolution by the Scientific Committee on Antarctic Research (SCAR-ACE)
- DIVERSITAS (Integrating biodiversity science for human wellbeing)
Data Availability
The data produced during this project are available to the academic community.
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20120207 (JR255B, JR259, JR275) |
| Departure Date | 2012-02-07 |
| Arrival Date | 2012-03-22 |
| Principal Scientist(s) | Phil T Leat (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 |
