Metadata Report for BODC Series Reference Number 580869


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
SonTek Argonaut moored 3D doppler current meter  current meters
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Dr Bill Turrell
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier 670/1
BODC Series Reference 580869
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2001-08-22 10:40
End Time (yyyy-mm-dd hh:mm) 2001-10-30 18:20
Nominal Cycle Interval 1200.0 seconds
 

Spatial Co-ordinates

Latitude 57.38380 N ( 57° 23.0' N )
Longitude 5.62270 W ( 5° 37.4' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 4.0 m
Maximum Sensor Depth 4.0 m
Minimum Sensor Height 25.0 m
Maximum Sensor Height 25.0 m
Sea Floor Depth 29.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Sea floor reference - Depth measured as a height above sea floor but converted into a depth relative to the sea surface according to the same datum as used for sea floor depth (applicable to instrument depths not bathymetric depths)
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODE Rank Units Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
LCDAEL01 1 Degrees True CurrDir Current direction (Eulerian) in the water body by in-situ current meter and correction to true North
LCSAEL01 1 Centimetres per second CurrSpd_CM Current speed (Eulerian) in the water body by in-situ current meter
TEMPPR01 1 Degrees Celsius Temp Temperature of the water body
 

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

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

SonTek Argonaut-MD Acoustic Doppler Current Meter

This instrument is a 3D, vector averaging current meter with low power consumption allowing deployments of up to 2 years. It does not require calibration, has no moving parts, no threshold velocity and can be fitted with optional pressure and temperature sensors, Sea-Bird SeaCAT or an inductive modem. It uses a fixed measurement volume centered 1.25 m from the instrument for 3 MHz systems (2.0 m for 1.5 MHz systems) and is housed in a single canister (either Deltrin or Titanium) with internal memory and batteries. It can be clamped to the mooring line or mounted within a mooring cage.

Standard Features

Optional Features

Specifications

Velocity
Range ± 6 m/s
Resolution 0.1 cm/s
Accuracy ± 1% of measured velocity, ± 0.5 cm/s
Data Output User programmable from 10 seconds to 12 hours
Temperature Sensor
Resolution 0.01°C
Accuracy ± 0.1°C
Compass/Tilt Sensor
Resolution Heading, Pitch, Roll 0.1°
Accuracy Heading ± 2°
Accuracy Pitch, Roll ± 1°
Physical and Environmental
Operating temperature -5°C to 40°C
Storage Temperature -10°C to 50°C
Weight in air 5.6 kg/12.5 lb (Delrin housing)
  11.8 kg/26 lb (Titanium housing)
Power
Input power 6-16 VDC
Typical power consumption 0.2-03 W (continuous operation)
  0.001 W (stand-by)
Battery capacity (alkaline) 368 W-hr

Further information is available at http://www.sontek.com or can be found in the manufacturer's specification sheet .

BODC processing

The data were provided to BODC in ascii format and were transferred to qxf format by BODC produced Matlab transfer 136. The full dataset was made up of velocity vectors in both the North/South direction and the East/West direction and temperature readings. The transfer converted the velocities to current speed and direction.

The vectors were resolved during transfer so no user activity is required for this conversion. The variables were then mapped to the appropriate BODC parameter code which can be seen below:

Variable Units BODC parameter code Units Comments
Current speed n/a LCSAEL01 cms -1 Speed generated from appropriate given vectors
Current Direction n/a LCDAEL01 cms -1 Speed generated from appropriate given vectors
Temperature deg C TEMPPR01 deg C -

Following the transfer the data was 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) 2001-08-22
End Date (yyyy-mm-dd) 2001-11-06
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier670
Platform Categorysubsurface mooring

FRS moored SonTek Argonaut MD current meter from Loch Kishorn

A moored SonTek Argonaut MD was deployed by Fisheries Research Services (FRS) in Loch Kishorn (57.38383° N, 5.62267° W) on 22/08/01 from a fish farm work boat, and recovered on 06/11/01 by the same vessel. The station had a nominal water depth of 29 m. The SonTek Argonaut had a sampling period of 20 minutes. The data were supplied as current meter records at two discrete depths: Series 6701 at 4 m and 6702 at 26 m.

The mooring consisted of the following instruments.

Instrument type Series Number Serial Number Deployment start Deployment end Instrument depth (m) Comments
SonTek MD Argonaut 6701 4 22/08/2001 06/11/2001 4 Stopped early due to battery failure.
SonTek MD Argonaut 6702 26 22/08/2001 06/11/2001 26 Stopped early due to battery failure.

Other Series linked to this Data Activity - 580870

Cruise

Cruise Name Loch Kishorn 2001
Departure Date 2001-08-22
Arrival Date 2001-08-22
Principal Scientist(s)
Ship Unknown self-propelled boat

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