Metadata Report for BODC Series Reference Number 2074516
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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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
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
MBA 2018-2020 WCO CTD Instrument Description
A sole Valeport Midas 606 CTD was used during the 2018-2020 data collection within the Western English Channel. This CTD was deployed without the use of a rosette or bottles, nor any other additional instruments.
| Sensor | Serial Number | Calibration Date | Comments |
|---|---|---|---|
| Valeport Midas 606 CTD | 20166 | - | - |
Valeport MIDAS 606 CTD
A conductivity, temperature, and pressure sensor designed for rapid profiling work and deployment on moorings. It measures conductivity (mS/cm), temperature (ITS90,deg C), and pressure (bar), using a high stability conductivity sensor, a fast response platinum resistance thermometer (PRT) temperature sensor, and a temperature compensated piezo-resistive pressure transducer. The sensors are all synchronised to sample at the same time. The CTD sensors are encased in titanium. The instrument can be powered by cable or battery, allowing for real-time or autonomous sampling. There are 5 sampling modes: continuous, burst, trip/profile, conditional, and delay. The instrument is also fitted with 16 MB of solid-state non-volatile FLASH memory. The CTD has a depth rating of 6000 m, however the pressure sensor ranges are 10, 50, 100, 300 or 600 bar with 0.001 % resolution and 0.01 % accuracy. The conductivity sensor has a range of 0 - 80 mS/cm, resolution of 0.002 mS/cm, and accuracy of 0.01 mS/cm. The temperature sensor range is -5 to 35 degC, with resolution 0.005 degC, and accuracy 0.01 degC.
For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/Valeport-MIDAS-CTD.pdf
MBA 2018-2020 WCO CTD Data: Processing by BODC
The CTD data were submitted to BODC as .csv files. 61 CTD downcasts were submitted along with additional information files for 2018,2019,2020 and completed BODC metadata submission templates. The data were archived under the accession MBA210021 in BODC systems. Basic checks of the data and metadata were carried out.
During transfer the originator's variables were mapped to unique BODC parameter codes. The following table shows the parameter mapping.
| Originator's variable | Originator's Units | BODC Parameter Code | BODC Units | BODC Description | Comments |
|---|---|---|---|---|---|
| Depth | m | PPSBS01 | m | Depth below surface of the water body by fixed in-situ pressure sensor and correction to zero at sea level and conversion to depth using unspecified algo rhythm | - |
| Conductivity | mS/cm | CNDCST01 | S/cm | Electrical conductivity of the water body by CTD | /10 to convert from mS/cm to S/cm |
| Pressure | DBar | PRESPR01 | DBar | Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level | - |
| Temperature | DegC | TEMPST01 | DegC | Temperature of the water body by CTD or STD | - |
| Salinity | PSU | PSLTZZ01 | Dimensionless | Practical salinity of the water body | - |
| Density | kg/m3 | - | - | - | Not transferred- Derived by originator |
| Sound Velocity | m/s | SVELCT01 | m/s | Sound velocity in the water body by CTD and computation from temperature and salinity by an un-specified algorithm | - |
| - | - | POTMCV01 | DegC | Potential temperature of the water body by computation using UNESCO 1983 algorithm | Derived parameter (derived during transfer) |
| - | - | PSALST01 | Dimensionless | Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm | Derived parameter (derived during transfer) |
| - | - | SIGTPR01 | kg/m3 | Sigma-theta of the water body by CTD and computation from salinity and potential temperature using UNESCO algorithm | Derived parameter (derived during transfer) |
Following transfer, BODC in-house visualisation software was using to screen the data. Any data values that were identified as suspect were assigned the appropriate BODC data quality flag following discussion with originator.
Parameters that have not been transferred can be provided on request.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
| Cruise Name | MS200923 |
| Departure Date | 2020-09-23 |
| Arrival Date | 2020-09-23 |
| Principal Scientist(s) | Rachel Brittain (Marine Biological Association of the UK) |
| Ship | RV MBA Sepia |
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 |
