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Metadata Report for BODC Series Reference Number 1930088


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 Ms Jane Read
Originating Organization National Oceanography Centre, Southampton
Processing Status QC in progress
Online delivery of data Download not available
Project(s) Oceans 2025
 

Data Identifiers

Originator's Identifier LADCP_053
BODC Series Reference 1930088
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-05-21 08:35
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 10.0 metres
 

Spatial Co-ordinates

Latitude 56.73080 N ( 56° 43.8' N )
Longitude 7.50010 W ( 7° 30.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 10.0 m
Maximum Sensor or Sampling Depth 210.0 m
Minimum Sensor or Sampling Height 10.0 m
Maximum Sensor or Sampling Height 210.01 m
Sea Floor Depth 220.01 m
Sea Floor Depth Source GEBCO1901
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
ERRVLDCP1Centimetres per secondError velocity of water current in the water body by lowered acoustic doppler current profiler (ADCP)
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 supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."


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 .lad format. All data provided were from two downward looking Teledyne RDI Workhorse 300 kHz ADCP's, which were in operation at the time. The following table shows how the variables within the ASCII files were mapped to appropriate BODC parameter codes:

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

Two Teledyne RDI Workhorse 300 kHz lowered acoustic Doppler current profilers (LADCP) (serial numbers 13329 and 10607) were mounted on two CTD frames, both were positioned in a downward looking orientation. Serial number 13329 was mounted on the stainless steel frame and was last serviced 21st September 2009. Serial number 10607 was mounted on the titanium frame and was last serviced 26th March 2008. Both instruments worked well throughout the cruise, without any evidence of problems.

Sampling strategy

CTD casts were taken during cruise D351, occupying 62 stations across the Ellett Line and Extended Ellett Line, from which 49 Lowered Acoustic Doppler Current Profiler (LADCP) profiles are available. Processing of LADCP data from stations 010, 025, 051, 052, 055, and 057 crashed, and of these, stations 051, 052, 055, and 057 were in shallow water where there were insufficient data for the processing to work. It is not clear why stations 010 and 025 failed to process as inspection of the LADCP data with the RDI software winADCP identified nothing wrong. It is unknown why data were not provided for station 043.

Data processing

Data were processed using MatLab Visbeck v10 software. The Visbeck software incorporates ship's position, CTD pressure and vessel mounted ADCP (VM-ADCP) currents to obtain the best solution for water column currents. However, VM-ADCP data were not ready during the cruise so the processing was run without. CTD data were merged with the 'abnv3511' (bestnav) file for position, then converted from PSTAR 2db files to MATLAB format. Time, position and pressure were separated into different .mat files for the Visbeck software.

Please refer to page 60 of the cruise report for more details about the processing methodology.


Project Information

Oceans 2025 - The NERC Marine Centres' Strategic Research Programme 2007-2012

Who funds the programme?

The Natural Environment Research Council (NERC) funds the Oceans 2025 programme, which was originally planned in the context of NERC's 2002-2007 strategy and later realigned to NERC's subsequent strategy (Next Generation Science for Planet Earth; NERC 2007).

Who is involved in the programme?

The Oceans 2025 programme was designed by and is to be implemented through seven leading UK marine centres. The marine centres work together in coordination and are also supported by cooperation and input from government bodies, universities and other partners. The seven marine centres are:

  • National Oceanography Centre, Southampton (NOCS)
  • Plymouth Marine Laboratory (PML)
  • Marine Biological Association (MBA)
  • Sir Alister Hardy Foundation for Marine Science (SAHFOS)
  • Proudman Oceanographic Laboratory (POL)
  • Scottish Association for Marine Science (SAMS)
  • Sea Mammal Research Unit (SMRU)

Oceans2025 provides funding to three national marine facilities, which provide services to the wider UK marine community, in addition to the Oceans 2025 community. These facilities are:

  • British Oceanographic Data Centre (BODC), hosted at POL
  • Permanent Service for Mean Sea Level (PSMSL), hosted at POL
  • Culture Collection of Algae and Protozoa (CCAP), hosted at SAMS

The NERC-run Strategic Ocean Funding Initiative (SOFI) provides additional support to the programme by funding additional research projects and studentships that closely complement the Oceans 2025 programme, primarily through universities.

What is the programme about?

Oceans 2025 sets out to address some key challenges that face the UK as a result of a changing marine environment. The research funded through the programme sets out to increase understanding of the size, nature and impacts of these changes, with the aim to:

  • improve knowledge of how the seas behave, not just now but in the future;
  • help assess what that might mean for the Earth system and for society;
  • assist in developing sustainable solutions for the management of marine resources for future generations;
  • enhance the research capabilities and facilities available for UK marine science.

In order to address these aims there are nine science themes supported by the Oceans 2025 programme:

  • Climate, circulation and sea level (Theme 1)
  • Marine biogeochemical cycles (Theme 2)
  • Shelf and coastal processes (Theme 3)
  • Biodiversity and ecosystem functioning (Theme 4)
  • Continental margins and deep ocean (Theme 5)
  • Sustainable marine resources (Theme 6)
  • Technology development (Theme 8)
  • Next generation ocean prediction (Theme 9)
  • Integration of sustained observations in the marine environment (Theme 10)

In the original programme proposal there was a theme on health and human impacts (Theme 7). The elements of this Theme have subsequently been included in Themes 3 and 9.

When is the programme active?

The programme started in April 2007 with funding for 5 years.

Brief summary of the programme fieldwork/data

Programme fieldwork and data collection are to be achieved through:

  • physical, biological and chemical parameters sampling throughout the North and South Atlantic during collaborative research cruises aboard NERC's research vessels RRS Discovery, RRS James Cook and RRS James Clark Ross;
  • the Continuous Plankton Recorder being deployed by SAHFOS in the North Atlantic and North Pacific on 'ships of opportunity';
  • physical parameters measured and relayed in near real-time by fixed moorings and ARGO floats;
  • coastal and shelf sea observatory data (Liverpool Bay Coastal Observatory (LBCO) and Western Channel Observatory (WCO)) using the RV Prince Madog and RV Quest.

The data is to be fed into models for validation and future projections. Greater detail can be found in the Theme documents.


Data Activity or Cruise Information

Cruise

Cruise Name D351
Departure Date 2010-05-11
Arrival Date 2010-05-28
Principal Scientist(s)Jane F Read (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameEllett Line/Extended Ellett Line Station 10G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 30.00' W
Water depth below MSL220.0 m

Ellett Line/Extended Ellett Line: Station 10G

Station 10G is one of the fixed CTD stations, which together form The Extended Ellett Line. The line lies between Iceland and the Sound of Mull (Scotland) crossing the Iceland Basin and Rockall Trough via the outcrop of Rockall. As part of this initiative, CTD dips, together with associated discrete sampling of the water column, have typically been carried out annually at this station since September 1996.

Prior to September 1996, Station 10G was part of a shorter repeated survey section, consisting of 35 fixed stations, known as The Ellett Line (originally termed the Anton Dohrn Seamount Section). This line incorporated those stations across the Rockall Trough and Scottish shelf between Rockall and the Sound of Mull and was visited at regular intervals (usually at least once a year) between 1975 and January 1996.

Related Fixed Station activities are detailed in Appendix 1


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: Ellett Line/Extended Ellett Line Station 10G

Related series for this Fixed Station 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
193372CTD or STD cast1983-05-24 06:09:0056.7333 N, 7.5 WRRS Challenger CH7B/83
96805CTD or STD cast1983-08-15 22:54:0056.7333 N, 7.5033 WRRS Challenger CH11/83
253820CTD or STD cast1985-05-08 06:32:0056.7333 N, 7.5 WRRS Challenger CH4/85
261125CTD or STD cast1985-08-19 17:26:0056.7333 N, 7.495 WRRS Challenger CH8/85
255899CTD or STD cast1985-12-17 08:00:0056.7333 N, 7.5 WRRS Frederick Russell FR13/85
346098CTD or STD cast1986-06-14 04:09:0056.7333 N, 7.5 WMV Dawn Sky DSK1/86
347944CTD or STD cast1986-09-26 06:24:0056.7333 N, 7.5 WRRS Frederick Russell FR8/86
264111CTD or STD cast1987-01-09 22:18:0056.7333 N, 7.5 WRRS Challenger CH9
250637CTD or STD cast1987-04-30 19:09:0056.7366 N, 7.5 WRRS Challenger CH14
255967CTD or STD cast1987-08-31 17:57:0056.735 N, 7.4833 WRRS Frederick Russell FR18/87
251689CTD or STD cast1987-11-28 03:02:0056.7316 N, 7.5016 WRRS Challenger CH22
266989CTD or STD cast1988-03-06 21:52:0056.735 N, 7.505 WRRS Challenger CH25
262718CTD or STD cast1988-06-08 22:20:0056.7333 N, 7.5016 WRRS Challenger CH30
265280CTD or STD cast1989-01-24 03:28:0056.7333 N, 7.5 WRRS Discovery D180
265790CTD or STD cast1989-05-05 20:26:0056.7333 N, 7.5 WRV Lough Foyle LF1/89
317579CTD or STD cast1989-08-05 00:36:0056.7333 N, 7.5017 WRV Lough Foyle LF2/89
316724CTD or STD cast1989-11-25 14:47:0056.73 N, 7.5 WRRS Charles Darwin CD44
259907CTD or STD cast1990-09-03 00:58:0056.7333 N, 7.5 WRRS Challenger CH71A
315886CTD or STD cast1990-12-09 22:38:0056.7333 N, 7.5 WRRS Challenger CH74A_1
382432CTD or STD cast1991-02-24 22:48:0056.7333 N, 7.5 WRRS Challenger CH75B
316134CTD or STD cast1991-07-02 05:12:0056.7333 N, 7.4983 WRRS Challenger CH81
384291CTD or STD cast1991-11-27 00:07:0056.73 N, 7.5 WRRS Challenger CH86B
385048CTD or STD cast1992-03-08 15:22:0056.7317 N, 7.5 WRRS Challenger CH89B
386433CTD or STD cast1992-09-26 07:52:0056.7317 N, 7.5 WRRS Challenger CH97
386003CTD or STD cast1993-05-20 13:07:0056.73 N, 7.4967 WRRS Challenger CH103
387946CTD or STD cast1993-09-09 22:14:0056.738 N, 7.5025 WRRS Challenger CH105
389013CTD or STD cast1994-03-15 03:17:0056.7335 N, 7.4922 WRRS Challenger CH110
389560CTD or STD cast1994-05-08 15:52:0056.7333 N, 7.5 WRRS Challenger CH112
390745CTD or STD cast1994-08-16 05:20:0056.726 N, 7.5008 WRRS Challenger CH114
391908CTD or STD cast1994-11-22 16:29:0056.7333 N, 7.5 WRRS Challenger CH116
434639CTD or STD cast1995-04-15 00:04:0056.7333 N, 7.5 WRRS Charles Darwin CD92B
435606CTD or STD cast1995-05-01 12:48:0056.7333 N, 7.5 WRRS Charles Darwin CD92B
390340CTD or STD cast1995-07-29 22:33:0056.733 N, 7.5012 WRRS Challenger CH120
433950CTD or STD cast1996-01-12 01:41:0056.7333 N, 7.5 WRRS Challenger CH124
433962CTD or STD cast1996-01-12 03:55:0056.7333 N, 7.5 WRRS Challenger CH124
1289255Water sample data1996-01-12 03:55:0056.7333 N, 7.5 WRRS Challenger CH124
1077159CTD or STD cast1999-06-05 01:01:0056.7285 N, 7.51 WNot applicable
1075036CTD or STD cast2000-02-01 21:48:0056.7325 N, 7.50433 WRRS Discovery D245
845168CTD or STD cast2003-07-25 06:05:0056.73388 N, 7.49955 WFS Poseidon PO300_2
667008CTD or STD cast2004-07-12 18:58:0056.732 N, 7.50483 WFS Poseidon PO314
881016CTD or STD cast2008-05-23 17:59:0056.73317 N, 7.49817 WFRV Scotia 0508S
1617034Water sample data2008-05-23 17:59:0056.73317 N, 7.49817 WFRV Scotia 0508S
954726CTD or STD cast2009-06-24 18:58:5256.73411 N, 7.50387 WRRS Discovery D340A
1052904CTD or STD cast2010-05-21 08:35:0156.72917 N, 7.49933 WRRS Discovery D351
1896953Water sample data2010-05-21 08:53:0056.72855 N, 7.49881 WRRS Discovery D351
1195352CTD or STD cast2011-05-20 14:15:0056.72917 N, 7.50233 WRRS Discovery D365
1203311CTD or STD cast2012-08-02 21:27:0056.72886 N, 7.5081 WRRS Discovery D379
1220676CTD or STD cast2013-05-24 04:02:1556.7333 N, 7.5 WRRS James Cook JC086
1371340CTD or STD cast2014-07-16 23:28:0056.733 N, 7.4994 WRRS James Clark Ross JR20140531 (JR302)
1723526CTD or STD cast2015-06-15 02:44:0456.7332 N, 7.4999 WRRS Discovery DY031
1722615Currents -subsurface Eulerian2015-06-15 02:44:2456.73316 N, 7.4999 WRRS Discovery DY031
1879439Water sample data2015-06-15 02:55:0056.73316 N, 7.4999 WRRS Discovery DY031
1764789CTD or STD cast2016-06-19 15:01:3356.7345 N, 7.4992 WRRS Discovery DY052
1765916Currents -subsurface Eulerian2016-06-19 15:01:4656.73453 N, 7.4992 WRRS Discovery DY052
1875094Water sample data2016-06-19 15:13:0056.73453 N, 7.4992 WRRS Discovery DY052