Metadata Report for BODC Series Reference Number 1743693
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
Data Description |
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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 Quality Report
During visual screening procedures M flags were applied to suspect values identified on the following series:
Series Reference | Comments |
---|---|
1743632 | From cycle 2238 to end of cast |
1743644 | From cycle 2062 to end of cast |
1743681 | From cycle 1264 to end of cast |
1743693 | From cycle 526 to end of cast |
1743700 | From cycle 623 to end of cast |
1743761 | From cycle 733 to end of cast |
1743797 | From cycle 802 to end of cast |
1743804 | From cycle 336 to end of cast |
1743816 | From cycle 788 to end of cast |
1743828 | From cycle 329 to end of cast |
1743841 | From cycle 176 to end of cast |
1743853 | From cycle 1531 to end of cast |
1743921 | From cycle 1257 to end of cast |
1743933 | From cycle 305 to end of cast |
1743957 | Flagged cycles 44-152, 187-401 and from 641 to end of cast |
1743969 | From cycle 2092 to end of cast |
1743970 | Flagged the whole cast |
1743994 | Flagged the whole cast |
1744008 | Flagged the whole cast |
1744021 | Flagged the whole cast |
1744033 | Flagged the whole cast |
1744045 | From cycle 371 to end of cast |
1744057 | From cycle 333 to end of cast |
1744069 | From cycle 1803 to end of cast |
Possible causes for the anomalous data can be due to wire snapping or probe hitting the sea floor. The originator reported that 5 XBT's collected data despite not being deployed, this was due to a malfunction in the XBT gun.
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
Originator's processing document for JR20091212 (JR228) XBT data
Sampling strategy
39 Sippican T5 Expendable Bathythermographs probes (XBT) were launched whilst the ship was sailing at 6 knots. The data were transferred to a PC via a USB interface that provided the communication with the XBT launcher.
Data Processing
When data were exported, a noise reduction procedure was applied. The noise threshold was of 3.0. Sound Velocity was calculated by assuming the following salinities:
Series Reference | Salinity |
---|---|
1743632 | 33.95 |
1743644 | 34 |
1743656 | 33.88 |
1743668 | 33.86 |
1743681 | 33.9 |
1743693 | 33.84 |
1743700 | 33.85 |
1743712 | 33.85 |
1743724 | 33.85 |
1743736 | 33.96 |
1743748 | 33.97 |
1743761 | 33.97 |
1743773 | 34 |
1743785 | 33.8 |
1743797 | 33.84 |
1743804 | 33.83 |
1743816 | 33.82 |
1743828 | 33.82 |
1743841 | 33.8 |
1743853 | 33.84 |
1743865 | 33.96 |
1743877 | 33.96 |
1743889 | 33.87 |
1743890 | 33.95 |
1743908 | 33.85 |
1743921 | 33.77 |
1743933 | 33.78 |
1743945 | 33.83 |
1743957 | 33.83 |
1743969 | 33.8 |
1743970 | 33.78 |
1743982 | 33.78 |
1743994 | 33.8 |
1744008 | 33.8 |
1744021 | 33.8 |
1744033 | 33.8 |
1744045 | 33.8 |
1744057 | 33.8 |
1744069 | 31.9 |
Processing by BODC of RRS James Clark Ross JR20091212 (JR228) XBT data
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 |
The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, and missing data by setting the data to an appropriate value and applying the quality control flag.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
Cruise Name | JR20091211 (JR228) |
Departure Date | 2009-12-11 |
Arrival Date | 2009-12-30 |
Principal Scientist(s) | Jonathan L Watkins (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 |