Metadata Report for BODC Series Reference Number 1173750
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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Problem Reports
No Problem Report Found in the Database
Quality report for James Clark Ross cruise JR20080221 (JR179) 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 |
46400 | 2202-2903 | Constant/suspect values |
46700 | 1433-2903 | 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
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 JR20080221 (JR179) XBT data
A total of four expendable bathymetry thermographs (XBT) were launched, at pre-defined positions, during cruise JR20080221 (JR179) whilst the ship was sailing. The 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
Glacial Retreat in Antarctica and Deglaciation of the Earth System (GRADES)
Introduction
GRADES was designed to investigate the state and stability of the Antarctic ice sheet, and its results will contribute to a better prediction of how the WAIS contributes to sea level rise.
Throughout the project ice-sheet models will be developed and tested using newly acquired ice-sheets histories. These models will use satellite data, reconstruct ions of past states of the ice sheet and new data assimilation techniques.
This project has three components:
- IMAGE: Inverse Modelling of Antarctica and Global Eustasy
- TIGRIS: TargetIngs Glacial Retreat and Ice-stream Systems
- QWAD: Quaternary West Antarctic Deglaciations
GRADES has links to other BAS programs like GEACEP, CACHE, ACES and COMPLEXITY.
Objectives:
- Understand the role of ice sheet disintegration in global climate change
- Assess what is causing the current imbalance in the WAIS
- Search for evidence of previous periods of rapid ice loss in the WAIS
- Determine the contribution of the WAIS to future sea level change
Data Availability
The data produced during this project are available to the academic community.
Acronyms used in the text:
- WAIS- West Antarctic Ice Sheet
- GEACEP- Greenhouse to ice-house: Evolution of the Antarctic Cryosphere and Palaeoenvironment
- CACHE- Climate and Chemistry: forcings , feedbacks and phasings in the Earth System
- ACES- Antarctic Climate and the Earth System
- COMPLEXITY- Natural Complexity Programme
Data Activity or Cruise Information
Cruise
Cruise Name | JR20080221 (JR179) |
Departure Date | 2008-02-21 |
Arrival Date | 2008-04-11 |
Principal Scientist(s) | Peter Enderlein (British Antarctic Survey), Robert D Larter (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 |