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Metadata Report for BODC Series Reference Number 1174347

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 Sophie Fielding
Originating Organization British Antarctic Survey
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Ecosystems

Data Identifiers

Originator's Identifier T5_00022_CONV
BODC Series Reference 1174347

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-12-30 14:51
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 metres

Spatial Co-ordinates

Latitude 53.85366 S ( 53° 51.2' S )
Longitude 37.59317 W ( 37° 35.6' 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 -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
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 -


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 JR20101221 (JR245, JR246, JR247) 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
46800 1081-2904 Constant/suspect values
46900 374-375, 660-2904 Constant/suspect values
47000 2876-2904 Constant/suspect values
47300 2782-2904 Constant/suspect values
47600 1028-2904 Constant/suspect values
47700 1072-2905 Constant/suspect values
47800 718-2094 Constant/suspect values
47900 1644-2904 Constant/suspect values
48000 256-622 Constant/suspect values
48100 516-1685 Suspect features
48200 2167-2903 Constant/suspect values
48300 2100-2903 Constant/suspect values
48600 2115, 2624-2904 Constant/suspect values
48700 718-2904 Constant/suspect values
48800 459-2904 Constant/suspect values
48900 172-2905 Suspect values
49000 196-2905 Constant/suspect values

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

Originator's processing document for JR20101221 (JR245, JR246, JR247) XBT data

A total of 26 expendable bathymetry thermographs (XBT) were launched at pre-defined positions, during cruise JR20101221 (JR245, JR246, JR247), whilst the ship was sailing. The speed was reduced from 10 to 7 knots to allow for data collection. 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



The Ecosystems programme is a BAS core quinquennial research programme, funded by NERC, that started in 2009. It contributes to the NERC's Biodiversity, Climate System and Earth System Science Themes. It addresses the Biodiversity Theme challenges to improve understanding of the role of biodiversity in ecosystem processes, resilience and environmental change; and to enable society to predict and mitigate effects of biodiversity change on processes that sustain life.

This programme will undertake an integrated analyses of the Antarctic ecosystems and aims to develop the understanding of the large-scale operation of Arctic ecosystems and the role of polar ecosystems in the Earth system. A range of experiments (microcosms, incubations and observational studies) will be used to explore how key polar populations respond to change, by examining their flexibility in terms of ecology, physiology, biochemistry and genetics, determining the biological limits of key species under current and future scenarios of temperature, ocean acidification, seasonality and desiccation and comparing the resilience of simple and complex communities. A combination of modelling and technical approaches will allow for the development of means to predict the response key species and populations to environmental change. It will also model how changing key environmental factors, such as food availability, temperature, seasonality, ice cover, among others, can affect species distribution, productivity and biological performance (growth, maturation, reproductive output). Field studies with an integrated approach (e.g. tracking and aerial surveys of predators combined with ship-based surveys of their prey) will be conducted simultaneously and linked to laboratory and long term data studies. Contributing to these studies will be the year-round monitoring of predators at Bird Island, summer sampling of predators at Signy Island, annual sampling of krill and environmental data in a pre-defined area located northeast of South Georgia.

The main objectives are:

  • To understand what determines the ability of species to adapt to change through genetic, physiological and ecological processes across a range of marine and terrestrial ecosystems
  • To develop quantitative descriptions of the life-cycles of species to determine their likely response to environmental change
  • To determine the resilience of polar ecosystems to past and current climate change, in order to predict how they may respond in the future
  • To provide data and policy advice, on key species and whole ecosystems, to underpin further development of sustainable fisheries management in the Antarctic and beyond, fulfilling UK obligations under the Antarctic Treaty
  • To use regional ecosystem analyses (e.g. of the Scotia Sea and Antarctic Peninsula) to develop models of polar ecosystem dynamics (structure, interactions and biodiversity) which will provide insight into the large-scale operation of bi-polar ecosystems

This programme has links to ICED the EBA programmes, which are part of SCAR and will provide science and policy advice to help shape UK government policy under a number of multinational conservation and management agreements:

  • Antarctic Treaty Consultative Meeting (ATCM)
  • Antarctic Treaty Committee for Environmental Protection (CEP)
  • Commission for the Conservation of Antarctic Marine living Resources (CCAMLR)
  • Agreement on the Conservation of Albatrosses and Petrels
  • International Whaling Commission

Data Availability

The data produced during this project are available to the academic community.

Acronyms used in the text:

BAS: British Antarctic Survey

NERC: Natural Environment Research Council

ICED: Integrated Climate and Ecosystem Dynamics

EBA: Evolution and Biodiversity in the Antarctic

SCAR: Scientific Committee on Antarctic Research

Data Activity or Cruise Information


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
Q value below limit of quantification