Metadata Report for BODC Series Reference Number 1930316
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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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||
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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
Teledyne RDI's Workhorse Monitor ADCP
The Workhorse Monitor acoustic doppler current profler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented four beam signal (300, 600 or 1200 kHz) and a standard depth rating of 200m or 600m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.
BODC Data Processing
The LADCP data were supplied as individual files in MATLAB (.mat) format. All data provided were from a downward looking Teledyne RDI Workhorse 300 kHz ADCP, which was in operation at the time. The following table shows how the variables within the MATLAB files were mapped to appropriate BODC parameter codes:
| Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comments |
|---|---|---|---|---|
| dr.z | m | ADEPZZ01 | m | - |
| dr.u | m s-1 | LCEWLW01 | cm s-1 | Units converted from m s-1 to cm s-1 by multiplying by 100. |
| dr.v | m s-1 | LCNSLW01 | cm s-1 | Units converted from m s-1 to cm s-1 by multiplying by 100. |
All reformatted data were visualised using the in-house Edserplo software. Suspect and missing data were marked by adding an appropriate quality control flag.
Originator's Data Processing
Instrument description
A Teledyne RDI Workhorse 300 kHz Lowered Acoustic Doppler Current Profiler (LADCP) (serial number 15288) was mounted on the CTD frame and positioned in a downward looking orientation.
Sampling strategy
A total of 62 CTD stations had LADCP profiles made. LADCP acquisition was switched off for the shallow stations of the Ellett Line (casts 059-074) and restarted during the final L line (casts 075-080) and at the site of the glider deployment. During cast 058 the CTD did not reach the bottom and these data were not processed. For the CTD cast at 003 no data were saved as there was an error in preparation for this cast, the cast at station 19 was aborted
Data processing
Data from the LADCP instrument was processed as soon as possible between stations to allow early detection of any problems with the ADCP workhorse.
Please refer to page 45 of the cruise report for more details about the processing methodology.
Project Information
NOCS National Capability
The National Oceanography Centre Southampton National Capability focuses on long term science concerned with basin/decadal variability of the Ocean.
Data Activity or Cruise Information
Cruise
| Cruise Name | JC086 |
| Departure Date | 2013-05-06 |
| Arrival Date | 2013-05-26 |
| Principal Scientist(s) | Colin R Griffiths (Scottish Association for Marine Science) |
| Ship | RRS James Cook |
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 |
