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Metadata Report for BODC Series Reference Number 1173866

Metadata Summary

Data Description

Data Category Bathythermograph -expendable
Instrument Type
Lockheed Martin Sippican T-5 XBT probe  bathythermographs; water temperature sensor; Expendable bathythermographs
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Claire Waluda
Originating Organization British Antarctic Survey
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) BAS Long Term Monitoring and Survey

Data Identifiers

Originator's Identifier T5_00012
BODC Series Reference 1173866

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2009-01-01 12:37
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 metres

Spatial Co-ordinates

Latitude 53.28710 S ( 53° 17.2' S )
Longitude 39.03798 W ( 39° 2.3' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 1.4 m
Maximum Sensor or Sampling Depth 1830.5 m
Minimum Sensor or Sampling Height 1844.42 m
Maximum Sensor or Sampling Height 3673.52 m
Sea Floor Depth 3674.92 m
Sea Floor Depth Source GEBCO1901
Sensor or Sampling Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Chart reference - Depth extracted from available chart


BODC CODERankUnitsTitle
ACYCAA011DimensionlessSequence number
DEPHCV011MetresDepth (spatial coordinate) relative to water surface in the water body by computation from probe free-fall time using unspecified algorithm
SVELCV011Metres per secondSound velocity in the water body by computation from temperature and salinity by unspecified algorithm
TEMPET011Degrees CelsiusTemperature of the water body by expendable bathythermograph (XBT)

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database

Quality report for James Clark Ross cruise JR20081228 (JR188) XBT data

All casts were screened and M flags applied to cycles where suspect data were identified. The following series/cycles were flagged:

Series reference Cycles Comments
51000 648-2904 Constant/suspect values
51100 873-2904 Constant/suspect values
51200 570-2905 Constant/suspect values
51900 615-2903 Constant/suspect values
52000 416-2904 Constant/suspect values
52100 all cycles flagged values are suspect
52300 1076-2904 Constant/suspect values
52400 564-2904 Constant/suspect values
52500 588-2904 Constant/suspect values
52600 569-2905 Constant/suspect values
52700 556-2905 Constant/suspect values
53400 580-2905 Constant/suspect values
53500 175-2904 Constant/suspect values

Data Access Policy

Open Data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."

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 JR20081228 (JR188) XBT data

A total of 30 expendable bathymetry thermographs (XBT) were launched during cruise JR20081228 (JR188) whilst the ship was sailing. The speed was reduced from 10 to 6 knots to allow for data acquisition. The data were transferred to a PC via a USB interface that provided the communication with the XBT launcher.

The data were were obtained with T5 Sippican probes and were not processed or calibrated by the originator.

Project Information

BAS Long Term Monitoring and Survey


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.

Global Science in an Antarctic Context (GSAC)


GSAC is the British Antarctic Survey research programme from 2005 to 2009, it encompasses 8 programmes, including 18 projects as well as long-term monitoring and survey activities.

This programme was created to fulfill BAS vision of becoming, by 2012, the leading international centre making use of the of the Antarctic and the Southern Ocean. This research programme consists of an integrated set of inter-disciplinary research, monitoring and survey activities designed to extract new knowledge from the Antarctic, provide information to policy makers and benefit society in general.

GSAC supports the Natural Environment Research Council (NERC) strategy Science for a Sustainable Future and contributes to other programmes such as the World Climate Research programme, the International Geosphere-Biosphere Programme, the Convention on Biological Diversity, the Scientific Committee for Antarctic Research and the International Polar Year 2007-2009.

The programme's components are highly interconnected and its content makes full use of BAS Antarctic infrastructure and builds on previous BAS research, survey and monitoring, whilst also exploring new areas.

The programmes contributing to GSAC are:

  • ACES- Antarctic Climate and the Earth System
  • BIOFLAME- Biodiversity, Function, limits and Adaptation from Molecules to Ecosystems
  • CACHE- Climate and Chemistry: Forcings, Feedbacks and Phasings in the Earth System
  • COMPLEXITY- Natural Complexity Programme
  • DISCOVERY 2010- Integrating Southern Ocean Ecosystems into the Earth System
  • GEACEP- Greenhouse to Ice-House Evolution of the Antarctic Cryosphere and Paleoenvironment
  • GRADES- Glacial Retreat in Antarctica and Deglatiation of the Earth System
  • SEC- Sun Earth Connections
  • LTMS- Long Term Monitoring and Survey

More detail is provided in each programme document.

Data Activity or Cruise Information


Cruise Name JR20081224 (JR188)
Departure Date 2008-12-24
Arrival Date 2009-01-06
Principal Scientist(s)Claire Waluda (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