Metadata Report for BODC Series Reference Number 636163
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 quality
The current speed and direction channels should be treated with caution due to the rotor sticking.
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
Aanderaa Recording Current Meter Model 7/8
Manufacturer's specifications: recording unit height 49.5cm (RCM8 52.0cm), diameter 12.8cm, vane size 48.5x50.0cm. Meter is designed for depths down to 2000m (RCM8 6000m). It incorporates a spindle which is shackled to the mooring line. The meter is attached to the spindle through a gimbal mounting which permits a maximum 27° deviation of the spindle from the vertical, the meter still remaining horizontal.
Meter comprises :
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Paddle wheel rotor magnetically coupled to an electronic counter
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Vane, which aligns instrument with current flow, has a balance weight ensuring static balance and tail fins to ensure dynamic balance in flows up to 250cm/s.
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Magnetic compass (needle is clamped to potentiometer ring) - direction recorded with 0.35° resolution, 5° accuracy for speeds 5 to 100cm/s, 7.5° accuracy for remaining speeds within 2.5 to 200cm/s range.
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Quartz clock, accuracy better than 2 sec/day within temperature range 0 to 20°C.
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Thermistor (temperature sensor), standard range -2.46 to 21.48°C (max on high range 36.04°C), accuracy 0.05°C, resolution 0.1 per cent of range, 63 per cent response time 12sec.
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Inductive cell conductivity sensor (optional), range 0 to 70mmho/cm standard resolution 0.1 per cent of range.
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Silicon piezoresistive bridge, standard range 0 to 3000 psi (RCM8 to 9000 psi), resolution 0.1% of range.
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Self balancing potentiometer which converts the output from each sensor into a 10 bit binary number for storage on magnetic tape.
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Associated electronics.
A built-in clock triggers the instrument at preset intervals and up to six channels are sampled in sequence. Channel 1 is a fixed reference reading for control purposes and data identification. Channels 2, 3 and 4 represent measurement of temperature, conductivity and pressure. Channels 5 and 6 represent the VECTOR AVERAGED current speed and direction since the previous triggering of the instrument. The number of rotor revolutions and the direction is sampled every 12 seconds and broken into North and East components. Successive components are added and recorded as speed and direction. For recording intervals longer than 10 minutes, speed and direction are sampled 1/50th of recording interval.
It has become common practice in some laboratories to deploy these meters as temperature and conductivity loggers without current measuring capabilities.
The following link will provide the manufacturer specifications:
Manufacturer specificationsBODC processing
The data were provided to BODC in ascii format and were transferred to qxf format by BODC produced Matlab transfer 325.
The variables were then mapped to the appropriate BODC parameter code which can be seen below:
Variable | Units | BODC parameter code | Units | Comments |
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Current speed | cms-1 | LCSAEL01 | cms-1 | Generated from current vectors |
Current direction | cms-1 | LCDAEL01 | cms-1 | Generated from current vectors |
Salinity | - | PSALPR01 | - | - |
Temperature | deg C | TEMPPR01 | deg C | - |
Following the transfer the data were screened using the BODC in-house visualisation software, EDSERPLO. Any suspect data points were flagged with the appropriate BODC flag code.
Originator's data processing
The data from the Vemco Miniloggers were merged to form "pseudo" thermistor chain records prior to being supplied to BODC.
FRS applied the standard manufaturers' calibrations to all data, and produced ascii files for submission to BODC.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2003-08-11 |
End Date (yyyy-mm-dd) | 2003-09-10 |
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 | 691 |
Platform Category | subsurface mooring |
FRS moored Aanderaa recording current meter (RCM7) from Loch Gairloch by Longa Island
A mounted Aanderaa Recording Current Meter (RCM7) was deployed by Fisheries Research Services (FRS) in Loch Gairloch by Longa Island (57.73357° N, 5.78692° W) on 11/08/03 as part of the Clupea 1303c cruise, and recovered on 10/09/03 by the Clupea 1403c cruise. The station had a nominal water depth of 18 m and the RCM7 had a sampling period of 10 minutes. The instrument was deployed at a depth of 16 m.
The mooring consisted of the following instruments.
Instrument type | Series Number | Serial Number | Deployment start | Deployment end | Instrument depth (m) | Comments |
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Aanderaa RCM7 | 6911 | 8049 | 11/08/2003 | 10/09/2003 | 16 | Rotor appears to be sticking near the end of the record |
Cruise
Cruise Name | 1303C |
Departure Date | 2003-08-11 |
Arrival Date | 2003-08-25 |
Principal Scientist(s) | James A M Kinnear (Fisheries Research Services Aberdeen Marine Laboratory) |
Ship | FRV Clupea |
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 |
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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 |
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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 |