Metadata Report for BODC Series Reference Number 702849

Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
SonTek Argonaut moored 3D doppler current meter  current meters
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Ms Sarah Hughes
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -

Data Identifiers

Originator's Identifier 719/1
BODC Series Reference 702849

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2005-08-09 12:32
End Time (yyyy-mm-dd hh:mm) 2005-11-01 11:24
Nominal Cycle Interval 240.0 seconds

Spatial Co-ordinates

Latitude 57.53117 N ( 57° 31.9' N )
Longitude 5.66267 W ( 5° 39.8' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 1.0 m
Maximum Sensor or Sampling Depth 1.0 m
Minimum Sensor or Sampling Height 39.0 m
Maximum Sensor or Sampling Height 39.0 m
Sea Floor Depth 40.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
LCDAEL011Degrees TrueDirection (towards) of water current (Eulerian measurement) in the water body by in-situ current meter and correction to true North
LCSAEL011Centimetres per secondSpeed of water current (Eulerian measurement) in the water body by in-situ current meter
TEMPPR011Degrees CelsiusTemperature 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


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)
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 or can be found in the manufacturer's specification sheet.

BODC Processing

Data were received by BODC in ASCII format files. The series were 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 and AAFDZZ01 day number and day fraction GMT Conversion by transfer
u + v cm/s Eastward and northward current velocity LCDAEL01 (direction) and LCSAEL01 (speed) °, cm/s Converted by transfer to current direction (Eulerian) in the water column by in-situ current meter and correction to true North, and current speed (Eulerian) in the water column by in-situ current meter
T degrees Celsius Temperature TEMPPR01 degrees Celsius  

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 Aanderaa RCM 7 current meter deployed in Loch Shieldaig had a sampling frequency of 3 readings per hour and the Sontek Argonaut MD current meter had a sampling frequency of 15 readings per hour. The RCM7 included temperature and conductivity sensors, while the Sontek included a temperature sensor only.

Data Processing

DAF applied the standard manufacturers' calibrations to all current, temperature and salinity data, and produced ASCII files for submission to BODC. Data files were named according to the mooring code (719) and the instrument number (1 or 2). The current meter file for 7191 (Sontek Argonaut) contained eastward and northward velocities, and temperature. No current data were collected for 7192 (RCM7 - see problem report) but temperature and salinity data were provided for this instrument.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2005-08-09
End Date (yyyy-mm-dd) 2005-11-01
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier719
Platform Categorysubsurface mooring

DAF current meter mooring, Loch Shieldaig

The mooring was located at 57° 31.87' N, 005° 39.76' W in a nominal water depth of 40 m.

The Department of Agriculture and Fisheries (DAF, now known as Marine Scotland Aberdeen Marine Laboratory) used a small boat to deploy the mooring on 09 August 2005. The mooring was recovered on 01 November 2005, and consisted of the following instruments.

Instrument type Serial Number Deployment start Deployment end Instrument depth (m) Comments
SONTEK Argonaut MD D24 2005-08-09 2005-11-01 1  
Aanderaa RCM 7 12563 2005-08-09 2005-11-01 20 No speed and diretcion data due to bio-fouling of the rotor

Related Data Activity activities are detailed in Appendix 1


Cruise Name 2005 Loch Shieldaig
Departure Date 2005-08-08
Arrival Date 2005-08-12
Principal Scientist(s)
Ship Fram

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
Q value below limit of quantification

Appendix 1: 719

Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Series IdentifierData CategoryStart date/timeStart positionCruise
702850Currents -subsurface Eulerian2005-08-09 11:50:0057.53117 N, 5.66267 WFram 2005 Loch Shieldaig