Metadata Report for BODC Series Reference Number 1810295
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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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
RRS James Clark Ross cruise JR20100118 (JR206,JR248) XBT Data Quality Report
M flags were applied to all cycles where the probe's wire length (1830 m) was exceeded as well as where data were considered anomalous. Please use the flagged data series below with caution.
- Series 1810129 - cycles 1 to 5 and 954 to 2905
- Series 1810166 - cycles 1819 to 1838 and 2756 to 2904
- Series 1810178 - cycles 1332 to 1396
- Series 1810210 - cycles 395 to 2901
- Series 1810222 - cycles1669 to 2902
- Series 1810258 - cycles2617 to 2094
- Series 1810283 - cycles 990 to 1088
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
RRS James Clark Ross cruise JR20100118 (JR206,JR248) XBT data BODC processing
Data Processing
All files were sent in .EDF format, an MK21 export format for this type of probes.
Reformatting
The data were converted to BODC internal format (QXF) using established procedures. The following table shows how the variables within the originator's files were mapped to appropriate BODC parameter codes.
| Originator's Parameter Name | Units | BODC Parameter Code | Units |
|---|---|---|---|
| Depth | m | DEPHCV01 | m |
| Temperature | °C | TEMPET01 | °C |
| Sound Velocity | m s-1 | SVELCV01 | m s-1 |
Screening was performed on all files and M flags applied to data that was considered anomalous or below the maximum depth for the deployment position.
RRS James Clark Ross cruise JR20100118 (JR206,JR248) XBT data originator's processing
Originator's Sampling Protocol
Sampling Strategy
18 XBTs were deployed at the start and end and at three equidistant points along the transect of each acoustic survey. The ship reduced speed to 6 knots to allow for this deployment. The data was exported but no processing was done. Sound velocity was derived with assumed salinity inputed by the originator using a custom BAS script.
Project Information
BAS Long Term Monitoring and Survey
Introduction
The Long Term Monitoring and Survey project (LTMS) has been running since the British Antarctic Survey (BAS) was created. This project is one of the BAS core projects, with several groups of scientists collecting various types of data e.g biological, geological, atmospheric, among others.
Data collection is achievable through a wide scope of instruments and platforms, e.g. the Antarctic research stations, autonomous instrument platforms deployed on or from BAS research ships, BAS aircrafts, satellite remote sensing and others.
Scientific Objectives
This project was implemented in order to measure change and variability in the Earth system. Its long term duration allows for the monitoring of processes that could be missed in shorter term studies and experiments. The data collected is also used to check and improve the reliability of models used to stimulate and predict the behavior of the Earth system.
The main objectives are:
- Topographic survey
- Geosciences survey
- Biological survey and monitoring
- Atmospheric and oceanographic monitoring
Data Availability
The data sets obtained through this project are available to the academic community.
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20100118 (JR206, JR248) |
| Departure Date | 2010-01-18 |
| Arrival Date | 2010-03-13 |
| 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 |
