Metadata Report for BODC Series Reference Number 2012070
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
DY086 Quality Control Report
Four gaps in the data were identified throughout the cruise. These gaps are:
- 16 November 2017 20:10:59 hours to 17 November 2017 11:43:44 hours
- 20 November 2017 22:34:27 hours to 21 November 2017 03:42:00 hours
- 27 November 2017 11:56:29 hours to 28 November 2017 18:42:15 hours
- 12 December 2017 06:59:10 hours to 12 December 2017 11:32:18 hours
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
RD Instruments- Ocean Surveyor 75kHz Vessel mounted ADCP.
| Long-Range Mode | ||
|---|---|---|
| Vertical Resolution Cell Size3 | Max. Range (m)1 | Precision (cm/s)2 |
| 8m | 520 - 650 | 30 |
| 16m | 560 - 700 | 17 |
| High-Precision Mode | ||
| Vertical Resolution Cell Size3 | Max. Range (m)1 | Precision (cm/s)2 |
| 8m | 310 - 430 | 12 |
| 16m | 350 - 450 | 9 |
1 Ranges at 1 to 5 knots ship speed are typical and vary with situation.
2 Single-ping standard deviation.
3 User's choice of depth cell size is not limited to the typical values specified.
Profile Parameters
- Velocity long-term accuracy (typical): ±1.0%, ±0.5cm/s
- Velocity range: -5 to 9m/s
- # of depth cells: 1 - 128
- Max ping rate: 0.7
Bottom Track
Maximum altitude (precision <2cm/s): 950m
Echo Intensity Profile
Dynamic range: 80dB
Precision: ±1.5dB
Transducer and Hardware
Beam angle: 30°
Configuration: 4-beam phased array
Communications: RS-232 or RS-422 hex-ASCII or binary output at 1200 - 115,200 baud
Output power: 1000W
Standard Sensors
Temperature (mounted on transducer)
- Range: -5° to 45°C
- Precision: ±0.1°C
- Resolution: 0.03°
Environmental
Operating temperature: -5° to 40°C (-5° to 45°C)*
Storage temperature: -30° to 50°C (-30° to 60°C)*
*later instruments have greater range.
Web Page
Further details can be found on the manufacturer's website or in the specification sheet
DY086 COMICS 75 kHz Shipboard ADCP Originator Data Processing
The following was taken from the JC086 cruise report. For more detailed information please refer to the cruise report.
The 75kHz Ocean Surveyor ADCP was operated throughout the DY086 cruise to measure the horizontal velocity field and is situated on the hull of the RRS Discovery. The data were acquired from the instrument using Version 1.48 of the RDI VMDAS software.
ADCP setup
| Variable | Setting |
|---|---|
| Number of Bins | 100 |
| Bin size | 8m |
| Blanking distance | 8m |
| Transducer depth | 6.6m |
| Processing mode | Narrowband single ping profile mode. |
| Maximum range | 800m |
Post-processing
The final processing of data was done using the University of Hawaii CODAS (Common Ocean Data Access System) System. The main steps that characterize CODAS processing include the removal of the the ship velocity, correction of the gyro heading with GPS-derived heading, estimation of the heading misalignment and manual inspection/editing of bad data.
Calibration
The water track calibration was derived during CODAS processing and the details are as follows:
| Median | Mean | STD | |
|---|---|---|---|
| amplitude | 1.0010 | 1.0008 | 0.0069 |
| phase | -0.0430 | -0.0789 | 0.3446 |
DY086 COMICS Vessel Mounted ADCP data: BODC Processing
The data arrived at BODC in one CODAS formatted NetCDF file, representing the data collected from the vessel mounted ADCP during cruise DY086. The data were reformatted to BODC's internal NetCDF format.
The following table shows the mapping of the originator's variables, from the original data file, to the appropriate BODC parameter codes:
| Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comment |
|---|---|---|---|---|
| lat | degrees_north | ALATGP01 | Degrees | - |
| lon | degrees_east | ALONGP01 | Degrees | - |
| uship | meter second-1 | APEWGP01 | cm/s | Conversion *100 applied |
| vship | meter second-1 | APNSGP01 | cm/s | Conversion *100 applied |
| u | meter second-1 | LCEWAS01 | cm/s | Conversion *100 applied |
| v | meter second-1 | LCNSAS01 | cm/s | Conversion *100 applied |
| depth | m | DBINAA01 | m | - |
| heading | degrees | - | - | Not transferred |
| amp | db | - | - | Not transferred |
| pg | % | - | - | Not transferred |
| tr_temp | Celsius | - | - | Not transferred |
The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate value and setting the quality control flag.
Parameters found in the originator's file, that were not transferred, are available upon request.
Project Information
Controls over Ocean Mesopelagic Interior Carbon Storage: COMICS
COMICS is a four-year collaborative research project that aims to quantify the flow of carbon in the ocean?s ?twilight? zone in order to accurately model global climate change. This ?twilight? zone is the part of the ocean between 100m and 1000m below the sea surface, where only a small amount of light from the sun can still penetrate.
By investigating carbon dynamics in the ocean interior, COMICS will help to improve predictions of future global climate change.
The COMICS project is led by the National Oceanography Centre and is a collaboration between the British Antarctic Survey and the universities of Queen Mary London, Liverpool, Oxford and Southampton. The project received funding from the Natural Environmental Research Council and runs between April 2017 and 2021.
Data Activity or Cruise Information
Cruise
| Cruise Name | DY086 (COMICS) |
| Departure Date | 2017-11-12 |
| Arrival Date | 2017-12-19 |
| Principal Scientist(s) | Richard Sanders (National Oceanography Centre, Southampton) |
| Ship | RRS Discovery |
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 |
