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Metadata Report for BODC Series Reference Number 1930666


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI 300kHz Workhorse Monitor direct-reading ADCP  current profilers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Prof Penny Holliday
Originating Organization National Oceanography Centre, Southampton
Processing Status QC in progress
Online delivery of data Download not available
Project(s) NOCS National Capability
 

Data Identifiers

Originator's Identifier 054DL000
BODC Series Reference 1930666
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2013-05-20 21:39
End Time (yyyy-mm-dd hh:mm) 2013-05-20 21:59
Nominal Cycle Interval 5.0 metres
 

Spatial Co-ordinates

Latitude 57.04500 N ( 57° 2.7' N )
Longitude 9.18999 W ( 9° 11.4' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 225.0 m
Minimum Sensor or Sampling Height 12.0 m
Maximum Sensor or Sampling Height 232.0 m
Sea Floor Depth 237.0 m
Sea Floor Depth Source GEBCO1401
Sensor or Sampling Distribution Sensor fixed with measurements made at multiple depths within a fixed range (e.g. ADCP) - The sensor is at a fixed depth, but measurements are made remotely from the sensor over a range of depths (e.g. ADCP measurements)
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Chart reference - Depth extracted from available chart
 

Parameters

BODC CODERankUnitsTitle
ACYCAA011DimensionlessSequence number
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
LCEWLW011Centimetres per secondEastward velocity of water current (Eulerian measurement) in the water body by lowered acoustic doppler current profiler (ADCP)
LCNSLW011Centimetres per secondNorthward velocity of water current (Eulerian measurement) in the water body by lowered acoustic doppler current profiler (ADCP)

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

Open 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.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."


Narrative Documents

Teledyne RDI's Workhorse Monitor ADCP

The Workhorse Monitor acoustic doppler current profler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented four beam signal (300, 600 or 1200 kHz) and a standard depth rating of 200m or 600m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.

BODC Data Processing

The LADCP data were supplied as individual files in MATLAB (.mat) format. All data provided were from a downward looking Teledyne RDI Workhorse 300 kHz ADCP, which was in operation at the time. The following table shows how the variables within the MATLAB files were mapped to appropriate BODC parameter codes:

Originator's Variable Originator's Units BODC Parameter Code BODC Units Comments
dr.z m ADEPZZ01 m -
dr.u m s-1 LCEWLW01 cm s-1 Units converted from m s-1 to cm s-1 by multiplying by 100.
dr.v m s-1 LCNSLW01 cm s-1 Units converted from m s-1 to cm s-1 by multiplying by 100.

All reformatted data were visualised using the in-house Edserplo software. Suspect and missing data were marked by adding an appropriate quality control flag.

Originator's Data Processing

Instrument description

A Teledyne RDI Workhorse 300 kHz Lowered Acoustic Doppler Current Profiler (LADCP) (serial number 15288) was mounted on the CTD frame and positioned in a downward looking orientation.

Sampling strategy

A total of 62 CTD stations had LADCP profiles made. LADCP acquisition was switched off for the shallow stations of the Ellett Line (casts 059-074) and restarted during the final L line (casts 075-080) and at the site of the glider deployment. During cast 058 the CTD did not reach the bottom and these data were not processed. For the CTD cast at 003 no data were saved as there was an error in preparation for this cast, the cast at station 19 was aborted

Data processing

Data from the LADCP instrument was processed as soon as possible between stations to allow early detection of any problems with the ADCP workhorse.

Please refer to page 45 of the cruise report for more details about the processing methodology.


Project Information

NOCS National Capability

The National Oceanography Centre Southampton National Capability focuses on long term science concerned with basin/decadal variability of the Ocean.


Data Activity or Cruise Information

Cruise

Cruise Name JC086
Departure Date 2013-05-06
Arrival Date 2013-05-26
Principal Scientist(s)Colin R Griffiths (Scottish Association for Marine Science)
Ship RRS James Cook

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
B nominal value
Q value below limit of quantification