Metadata Report for BODC Series Reference Number 1801882
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
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
Lockhead Martin T7 XBT probe
The XBT's deployed on this cruise were orignally manufactured by Sippican, which was acquired by Lockhead Martin sometime after this cruise ended.
An XBT probe is an expendable free-fall temperature probe that provides a profile of measured temperature against depth calculated from a fall-rate model. The T-7 XBT Probe can be used within a maximum depth of 760m, may be deployed at a ship speed of up to 15 knots and has a vertical resolution of 65cm.
Further details can be found in the manufacturer's specification sheet.
RRS James Clark Ross Cruise JR20141231 (JR307, JR308) XBT: BODC Processing
BODC Processing
Files were submitted to BODC in .edf format, which can be opened in a text editor.
Files were reformatted to BODC internal NetCDF format using established procedures. No conversions were applied to originator data values. Originator variable were mapped to appropriate BODC parameter codes for standardisation purposes, the below table summarises this.
| Originator's Parameter | Originator's Units | BODC Description | BODC Parameter Code | BODC Units | Comments |
| depth | m | Depth below surface of the water body by computation from probe free-fall time using unspecified algorithm | DEPHCV01 | m | - |
| temperature | deg C | Temperature of the water body by expendable bathythermograph (XBT) | TEMPET01 | deg 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 | - |
| resistance | ohms | - | - | - | Channel not transferred, used to derive temperature values. |
Data were screened using BODC internal software EDSERPLO for data quality purposes.
Please note the original data submitted to BODC including the resistance channel are available by request.
RRS James Clark Ross Cruise JR20141231 (JR307, JR308) XBT: Originator's Processing
Originator's Sampling Protocol
One Expendable Bathythermograph (XBT) was deployed to provide a sound velocity profile to calibrate the measured depths obtained from a short preliminary swath bathymetry survey.
Originator's Processing
Data were recorded and displayed real-time using Sea-Air Systems software:
- WinMK21 v2.13.1
- MIK21COEF v2.9.1
- MK21AL v2.14.1
Pre-launch of XBT deployments, metadata were entered into the software and checks were made to ensure the PC time was synced to ship time (GMT). Output files were stored in .edf (ASCII output of profile data) and .RDF files (operational file).
The .edf file contained depth, temperature and sound velocity data. Additional metadata was also stored in the header of the file such as deployment time, latitude, longitude, probe type, terminal depth, depth coefficients, constant salinity value used to derive sound velocity.
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 | JR20141231 (JR307, JR308) |
| Departure Date | 2014-12-31 |
| Arrival Date | 2015-01-07 |
| Principal Scientist(s) | Peter Enderlein (British Antarctic Survey), Sian Frances Henley (University of Edinburgh School of GeoSciences) |
| 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 |
