Metadata Report for BODC Series Reference Number 1043716


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Aanderaa Seaguard Recording Current Meter  current meters
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Ms Sarah Hughes
Originating Organization Marine Scotland Aberdeen Marine Laboratory
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier 784/3
BODC Series Reference 1043716
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-10-06 20:41
End Time (yyyy-mm-dd hh:mm) 2010-11-29 10:31
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 60.31083 N ( 60° 18.6' N )
Longitude 0.70267 W ( 0° 42.2' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 41.0 m
Maximum Sensor Depth 41.0 m
Minimum Sensor Height 52.0 m
Maximum Sensor Height 52.0 m
Sea Floor Depth 93.0 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
PSALPR01 1 Dimensionless P_sal Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
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 quality report

The salinity data show a decline in values and an increase in noise towards the end of the series. This is likely to be a result of fouling of the conductivity sensor and the data should be regarded as suspect. No flags have been added to the data as it is impossible to identify a point at which the decline in quality begins.


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 SEAGUARD Recording Current Meter

A multi-frequency Doppler current sensor for measuring horizontal current speed and direction. The shallow water (SW), intermediate water (IW) and deep water (DW) models can be deployed to 300 m, 2000 m and 6000 m, respectively. The instrument has a maximum sampling rate of 0.5 Hz, a velocity range of 0 - 300 cm/s, and incorporates an electronic compass and a tilt sensor. A number of additional oceanographic sensors may also be attached.

Further details can be found in the manufacturer's specification sheet .

BODC Processing

Data were received in ASCII format files. The series were reformatted to QXF (a netCDF format) using the 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 BODC Parameter Code BODC Units Comments
Time DD/MM/YYYY HH:MI (GMT) AADYAA01, AAFDZZ01 day number, day fraction Conversion by transfer
Eastward and northward current velocity (u + v) cm/s LCDAEL01 (direction), 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
Temperature °C TEMPPR01 °C  
Salinity p.p.t. PSALPR01 Dimensionless  

Following transfer to QXF, the data were screened using BODC's in-house visualisation software, EDSERPLO. Any data considered as suspect were flagged accordingly. Flags from the originator marking suspect data were retained during transfer.

Originator's Data Processing

Marine Scotland applied the standard manufacturers' calibrations to all current, temperature and salinity data and produced ASCII files for submission to BODC. Data files (.hmo) were named according to the mooring code and the instrument number. Each current meter file contained eastward and northward velocities and temperature. Salinity data for each instrument were contained in files appended 's'. Header metadata were collated in additional files (.frm). Speed/Direction distributions (.csd) and harmonic analyses files (.lpr) for the current meter data were also generated.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2010-05-18
End Date (yyyy-mm-dd) 2010-11-30
Organization Undertaking ActivityMarine Scotland Aberdeen Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier784
Platform Categorysubsurface mooring

FRS current meter mooring (784) from East Shetland 1

A current meter mooring was deployed by Marine Scotland, Aberdeen Marine Laboratory at site East Shetland 1 (60° 18.65'N 00° 42.16'W) on 18/05/2010 during the FRV Scotia cruise 0610S. The mooring was recovered on 30/11/2010 by the FV Unity cruise 1810H. The station had a nominal water depth of 93m.

The mooring consisted of the following instruments:

Instrument type Series Number Serial Number Deployment start Deployment end Instrument depth (m) No. Readings/Hour Comments
Aanderaa Seaguard RCM IW 7841 416 18/05/2010 30/11/2010 41 6 The instrument stopped and restarted itself on 06/10/10 resulting in two series for this deployment (7841 and 7843). Salinity degradation due to fouling.
Aanderaa Seaguard RCM IW 7842 417 18/05/2010 30/11/2010 84 6 Salinity degradation due to fouling.

Other Series linked to this Data Activity - 1043704 1043697

Cruise

Cruise Name 0610S
Departure Date 2010-05-14
Arrival Date 2010-06-01
Principal Scientist(s)George Slesser (Marine Scotland Aberdeen Marine Laboratory)
Ship FRV Scotia

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