Metadata Report for BODC Series Reference Number 897147


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 Ms Sarah Hughes
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier 743/1
BODC Series Reference 897147
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2007-04-04 10:32
End Time (yyyy-mm-dd hh:mm) 2007-06-29 08:44
Nominal Cycle Interval 240.0 seconds
 

Spatial Co-ordinates

Latitude 56.38950 N ( 56° 23.4' N )
Longitude 4.23617 W ( 4° 14.2' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 1.0 m
Maximum Sensor Depth 1.0 m
Minimum Sensor Height 27.0 m
Maximum Sensor Height 27.0 m
Sea Floor Depth 28.0 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 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
 

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

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 Sontek Argonaut MD current meter deployed in Loch Earn had a sampling frequency of 15 readings per hour. The instrument included a temperature sensor.

Data Processing

FRS applied the standard manufacturers' calibrations to all current and temperature data, and produced ASCII files for submission to BODC. Data files were named according to the mooring code (743) and the instrument number (1). The current meter file (7431) contained eastward and northward velocities, and temperature.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2007-04-04
End Date (yyyy-mm-dd) 2007-06-29
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier743
Platform Categorysubsurface mooring

FRS current meter mooring, Loch Earn

The mooring was located at 56° 23.37' N, 004° 14.17' W in a nominal water depth of 28 m.

The mooring was deployed on 04 April 2007 by Fisheries Research Services (FRS, now known as Marine Scotland Aberdeen Marine Laboratory) and recovered on 29 June 2007. Both deployment and recovery were performed by a small boat. The mooring consisted of the following instruments.

Instrument type Serial Number Deployment start Deployment end Instrument depth (m) Comments
Sontek Argonaut MD D226 2007-04-04 2007-06-29 1  

Cruise

Cruise Name Earn2007
Departure Date 2007-04-04
Arrival Date 2007-04-04
Principal Scientist(s)Stuart Wallace (Fisheries Research Services Aberdeen Marine Laboratory)
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