Metadata Report for BODC Series Reference Number 896377
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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Parameters |
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Public domain 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.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
RBR Ltd Depth Recorder Model DR-1050
Single channel data logger.
Manufacturer's specifications:
Case size: 230 mm x 38 mm
Material: Delrin (acetal copolymer); titanium (for up to 10,500 m)
Depth ratings: Delrin housing 10/20/50/100/200/500/740 m (dBar); titanium 1000/2000/4000/6000/10,000 m (dBar)
Accuracy: ±0.05% full scale
Resolution: <0.001% full scale
Time Constant: < 10 msec
The DR-1050 uses an internal Keller piezo-resistive strain gauge sensor (an absolute pressure sensor). Atmospheric pressure must be subtracted from the absolute pressure to obtain water depth. The standard depth sensors are calibrated at RBR to better than ±0.05% full scale. Using reliable semiconductor technology and a 316 stainless steel housing, the depth sensors are developed for long-term stability in harsh environments. This is also reflected in their operating temperature range of -40°C to 125°C. Typical depth hysteresis of the depth sensor is ±0.015%FS, and it has a response time of 0.1 msec.
Data are uploaded from the logger and processed using the RBR Windows Data Logger Software.
Further details can be found in the manufacturer's specification sheet.
BODC Processing
Data were received by BODC in ASCII format files. For each instrument there is a file containing a pressure time series.
This series was reformatted to the internal QXF format using BODC transfer function 325. The following table shows how the variables within the file were mapped to the appropriate BODC parameter codes.
Original parameter name | Original Units | Description | BODC Parameter Code | BODC Units | Comments |
---|---|---|---|---|---|
Time | DD/MM/YYYY HH:MI | date and time | AADYAA01 + AAFDZZ01 | day number and day fraction GMT | Conversion by transfer |
P | decibars | Pressure | PREXPS01 | decibars |
The deck pressure had not been measured, or removed from the data series, prior to submission of data to BODC. We thus derived a pressure offset from the instrument deployment pressure (calculated from deployment depth and latitude) and the first reading of the pressure time series. All water level recorders were bottom-mounted so the instrument depth was simply the depth of the seabed measured by the ship's echosounder at the time of deployment. The offset was applied to the entire series following the form: Pcorr = Porig - offset where Pcorr is the corrected pressure and Porig is the original pressure reading.
Following transfer to QXF, the data were screened using BODC's in-house visualisation software, EDSERPLO. Any data considered as suspect were flagged 'M'. Flags from the originator marking suspect data were retained during transfer and flagged 'L'.
Originator's Data Processing
Sampling Strategy
The depth recorder deployed in the Pentland Firth had a sampling frequency of 12 readings per hour.
Data Processing
FRS applied the standard manufacturers' calibrations to all data, and produced ASCII files for submission to BODC. Data files were named according to the instrument code (768w).
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2008-10-10 |
End Date (yyyy-mm-dd) | 2008-10-12 |
Organization Undertaking Activity | Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory) |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | 768w |
Platform Category | fixed benthic node |
FRS bottom mounted depth recorder, Pentland Firth
The depth recorder (DR) was located at 58° 39.32' N, 003° 19.04' W in a nominal water depth of 40 m.
The DR was deployed on 10 October 2008 by Fisheries Research Services (FRS, now known as Marine Scotland Aberdeen Marine Laboratory) on cruise FRV Scotia 1208S_2 and recovered on 12 October 2008. Instrumentation details are contained in the following table.
Instrument type | Serial Number | Deployment start | Deployment end | Instrument depth (m) | Comments |
---|---|---|---|---|---|
RBR Data Logger DR-1050 | 13556 | 2008-10-10 | 2008-10-12 | 40 |
Cruise
Cruise Name | 1208S_2 |
Departure Date | 2008-10-09 |
Arrival Date | 2008-10-16 |
Principal Scientist(s) | Peter Hayes (Fisheries Research Services Aberdeen Marine Laboratory) |
Ship | FRV Scotia |
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 |