Metadata Report for BODC Series Reference Number 897111

Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
Aanderaa RDCP 600 Recording Doppler Current Profiler  current profilers
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 727/1
BODC Series Reference 897111

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2006-07-13 12:31
End Time (yyyy-mm-dd hh:mm) 2006-11-16 13:16
Nominal Cycle Interval 900.0 seconds

Spatial Co-ordinates

Latitude 57.53583 N ( 57° 32.1' N )
Longitude 5.68650 W ( 5° 41.2' 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 61.0 m
Maximum Sensor Height 61.0 m
Sea Floor Depth 65.0 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


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

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 quality report

A scatter plot of current data reveals an unusual distribution of points, with a faint spiral shape and a low concentration of points to the southwest. The RDCP depth bin from which this series was derived was located at 4 m depth in a sea loch, so would be strongly influenced by wind-driven currents. Furthermore, such a shallow bin from an upward-looking acoustic instrument might be expected to show the effects of side lobe interference from the strong backscatter signal across the water surface. However, no data points have been flagged as suspect.

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 Doppler Current Profiler (RDCP 600)

The RDCP 600 is a medium range, 600 kHz self-recording Doppler Current Profiler. The standard RDCP 600 can be deployed to a depth of 300 m, with a velocity range of 0-500 cm/s, vertical velocity accuracy of 1.0 cm s -1 and horizontal velocity accuracy of 0.5cm s -1 . Standard parameters include current speed and direction, temperature, signal strength and instrument tilt. Optional parameters include oxygen, turbidity, conductivity, pressure and wave parameters. The instruments has several possible applications for example it may be moored at the bottom in a fixed frame, in an inline mooring string looking upwards or downwards, or it may be installed on a buoy system or at a quay looking downwards.

The RDCP 600 employs an advanced tilt compensation algorithm to achieve true horizontal current measurements even when the instrument is tilted.

Further details 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

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 Recording Doppler Current Profiler deployed in Loch Shieldaig had a sampling frequency of 4 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 mooring (727) and series number (1, 2 or 3, below). The data were supplied as quasi-current meter records at three discrete depths: series 7271 from 4 m; series 7272 from 28 m and series 7273 from 60 m. Each file contained eastward and northward velocities.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2006-07-13
End Date (yyyy-mm-dd) 2006-11-16
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier727
Platform Categoryfixed benthic node

FRS bottom mounted Aanderaa Recording Doppler Current Profiler, Loch Shieldaig

The Aanderaa Recording Doppler Current Profiler (RDCP600) was located at 57° 32.15' N, 005° 41.19' W in a nominal water depth of 65 m.

The RDCP600 was deployed on 13 July 2006 by Fisheries Research Services (FRS, now known as Marine Scotland Aberdeen Marine Laboratory) on cruise Fram 1206H (10 July 2006-14 July 2006) and recovered on 16 November 2006. Instrumentation details are included in the following table.

Instrument type Serial Number Deployment start Deployment end Instrument depth (m) Comments
Aanderaa RDCP600 121 2006-07-13 2006-11-16 65 Three quasi-current meter records were derived from the RDCP at 4 m, 28 m and 60 m

Other Series linked to this Data Activity - 897123 897135


Cruise Name 1206H
Departure Date 2006-07-10
Arrival Date 2006-07-14
Principal Scientist(s)John Beaton (Fisheries Research Services Aberdeen Marine Laboratory)
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