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Metadata Report for BODC Series Reference Number 1929930


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_036
BODC Series Reference 1929930
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-05-19 17:23
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 10.0 metres
 

Spatial Co-ordinates

Latitude 57.48260 N ( 57° 29.0' N )
Longitude 11.53370 W ( 11° 32.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 10.0 m
Maximum Sensor or Sampling Depth 2000.0 m
Minimum Sensor or Sampling Height 20.46 m
Maximum Sensor or Sampling Height 2010.46 m
Sea Floor Depth 2020.46 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 H
CategoryOffshore location
Latitude57° 28.98' N
Longitude11° 31.98' W
Water depth below MSL2020.0 m

Ellett Line/Extended Ellett Line: Station H

Station H 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 H 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 H

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
90219CTD or STD cast1975-11-09 07:36:0057.485 N, 11.5366 WRRS Challenger CH14A/75
91260CTD or STD cast1976-05-22 19:35:0057.48 N, 11.545 WRRS Challenger CH8/76
92054CTD or STD cast1977-04-16 04:20:0057.4883 N, 11.5433 WRRS Challenger CH6B/77
94165CTD or STD cast1977-07-24 01:06:0057.4816 N, 11.5283 WRRS Challenger CH11/77
88786CTD or STD cast1977-08-22 11:58:0057.4883 N, 11.5433 WRRS Challenger CH13/77
92379CTD or STD cast1978-02-05 09:26:0057.4833 N, 11.5333 WRRS Challenger CH2/78
92472CTD or STD cast1978-02-06 22:05:0057.485 N, 11.5416 WRRS Challenger CH2/78
94466CTD or STD cast1978-04-16 12:28:0057.4816 N, 11.5483 WRRS Challenger CH6/78
95248CTD or STD cast1978-06-05 14:30:0057.4833 N, 11.53 WRRS Challenger CH9/78
186037CTD or STD cast1978-08-09 21:14:0057.4816 N, 11.5333 WRRS Challenger CH11B/78
190811CTD or STD cast1978-09-12 02:48:0057.4833 N, 11.5333 WRRS Challenger CH11D/78
187538CTD or STD cast1980-03-02 08:52:0057.48 N, 11.5433 WRRS Challenger CH4/80
188880CTD or STD cast1980-05-04 09:33:0057.5 N, 11.5333 WRRS Challenger CH7/80
188333CTD or STD cast1981-04-20 08:04:0057.5 N, 11.5216 WRRS Challenger CH6B/81
187121CTD or STD cast1981-10-14 21:40:0057.4833 N, 11.535 WRRS Challenger CH15/81
189312CTD or STD cast1982-04-29 19:01:0057.4833 N, 11.5333 WRRS Challenger CH7A/82
189453CTD or STD cast1982-05-09 08:56:0057.4816 N, 11.5316 WRRS Challenger CH7B/82
193600CTD or STD cast1983-05-26 02:50:0057.4833 N, 11.5416 WRRS Challenger CH7B/83
96971CTD or STD cast1983-08-18 00:26:0057.485 N, 11.52 WRRS Challenger CH11/83
313345CTD or STD cast1984-06-28 18:34:0057.4833 N, 11.535 WRRS Challenger CH2/84
257440CTD or STD cast1984-11-21 19:49:0057.4833 N, 11.5383 WRRS Challenger CH10/84
254000CTD or STD cast1985-05-09 10:27:0057.4833 N, 11.5316 WRRS Challenger CH4/85
261310CTD or STD cast1985-08-21 08:45:0057.485 N, 11.5316 WRRS Challenger CH8/85
264276CTD or STD cast1987-01-11 04:40:0057.4833 N, 11.5333 WRRS Challenger CH9
250465CTD or STD cast1987-04-28 20:56:0057.4866 N, 11.515 WRRS Challenger CH14
265464CTD or STD cast1989-01-25 12:19:0057.4833 N, 11.5333 WRRS Discovery D180
265962CTD or STD cast1989-05-06 21:56:0057.4833 N, 11.5333 WRV Lough Foyle LF1/89
317740CTD or STD cast1989-08-06 00:46:0057.4833 N, 11.5317 WRV Lough Foyle LF2/89
316933CTD or STD cast1989-11-26 20:49:0057.4833 N, 11.5333 WRRS Charles Darwin CD44
314975CTD or STD cast1990-06-27 13:58:0057.4833 N, 11.5333 WRRS Challenger CH67A
259735CTD or STD cast1990-09-01 18:19:0057.4833 N, 11.5333 WRRS Challenger CH71A
382616CTD or STD cast1991-02-27 18:17:0057.4833 N, 11.5367 WRRS Challenger CH75B
316318CTD or STD cast1991-07-03 11:34:0057.485 N, 11.5317 WRRS Challenger CH81
386598CTD or STD cast1992-09-28 02:44:0057.485 N, 11.5333 WRRS Challenger CH97
385626CTD or STD cast1993-05-15 10:56:0057.4767 N, 11.5333 WRRS Challenger CH103
387762CTD or STD cast1993-09-06 07:47:0057.4837 N, 11.5363 WRRS Challenger CH105
389234CTD or STD cast1994-05-02 17:00:0057.4833 N, 11.5333 WRRS Challenger CH112
390930CTD or STD cast1994-08-18 16:05:0057.4833 N, 11.5333 WRRS Challenger CH114
392094CTD or STD cast1994-11-26 01:19:0057.4837 N, 11.5248 WRRS Challenger CH116
435201CTD or STD cast1995-04-24 17:52:0057.4833 N, 11.5333 WRRS Charles Darwin CD92B
435298CTD or STD cast1995-04-28 08:36:0057.4833 N, 11.5333 WRRS Charles Darwin CD92B
390561CTD or STD cast1995-07-31 23:09:0057.487 N, 11.5483 WRRS Challenger CH120
434154CTD or STD cast1996-01-13 23:30:0057.4833 N, 11.5333 WRRS Challenger CH124
434222CTD or STD cast1996-01-15 08:45:0057.4833 N, 11.5333 WRRS Challenger CH124
1014681CTD or STD cast1996-10-02 05:33:0057.49117 N, 11.52083 WRRS Discovery D223A
1850181Water sample data1996-10-02 06:30:0057.49113 N, 11.52085 WRRS Discovery D223A
1008012CTD or STD cast1997-09-13 16:27:0057.48733 N, 11.531 WRRS Discovery D230
1304991Water sample data1997-09-13 17:31:0057.4873 N, 11.53093 WRRS Discovery D230
1020625CTD or STD cast1998-05-25 23:32:0057.478 N, 11.542 WRRS Discovery D233
1306266Water sample data1998-05-26 00:34:0057.47805 N, 11.54201 WRRS Discovery D233
1849432Water sample data1998-05-26 00:34:0057.47805 N, 11.54201 WRRS Discovery D233
1076955CTD or STD cast1999-05-31 01:38:0057.47517 N, 11.53283 WNot applicable
1070763CTD or STD cast1999-09-13 04:36:0057.4865 N, 11.53517 WRRS Discovery D242
1252088Water sample data1999-09-13 05:07:0057.4865 N, 11.53517 WRRS Discovery D242
1075257CTD or STD cast2000-02-05 09:12:0057.49167 N, 11.49883 WRRS Discovery D245
559100CTD or STD cast2000-05-18 07:44:0057.4817 N, 11.53 WFRV Scotia 0700S
676896CTD or STD cast2001-05-21 09:38:0057.48717 N, 11.53183 WRRS Discovery D253
626802CTD or STD cast2003-04-18 17:15:0057.483 N, 11.535 WFRV Scotia 0703S
844940CTD or STD cast2003-07-22 09:03:0057.48262 N, 11.53575 WFS Poseidon PO300_2
667162CTD or STD cast2004-07-14 10:10:0057.4805 N, 11.5265 WFS Poseidon PO314
896501CTD or STD cast2005-10-11 16:53:0057.48332 N, 11.53282 WRRS Charles Darwin CD176
776560CTD or STD cast2006-10-24 19:20:2157.4905 N, 11.5265 WRRS Discovery D312
847870CTD or STD cast2007-08-29 08:43:3457.48325 N, 11.53212 WRRS Discovery D321B
880812CTD or STD cast2008-05-22 06:36:0057.48167 N, 11.524 WFRV Scotia 0508S
1616830Water sample data2008-05-22 06:36:0057.48167 N, 11.524 WFRV Scotia 0508S
954265CTD or STD cast2009-06-17 22:24:3857.48168 N, 11.53091 WRRS Discovery D340A
1052720CTD or STD cast2010-05-19 17:23:0857.48 N, 11.53083 WRRS Discovery D351
1896756Water sample data2010-05-19 18:26:0057.48349 N, 11.52862 WRRS Discovery D351
1195745CTD or STD cast2011-05-30 13:56:3257.4935 N, 11.5455 WRRS Discovery D365
1203556CTD or STD cast2012-08-04 20:13:0057.48485 N, 11.53195 WRRS Discovery D379
1220387CTD or STD cast2013-05-19 07:45:1057.487 N, 11.5306 WRRS James Cook JC086
1371143CTD or STD cast2014-07-15 06:15:1557.4831 N, 11.5329 WRRS James Clark Ross JR20140531 (JR302)
1723274CTD or STD cast2015-06-12 01:28:1257.4828 N, 11.5324 WRRS Discovery DY031
1722363Currents -subsurface Eulerian2015-06-12 01:28:3557.48282 N, 11.53242 WRRS Discovery DY031
1879218Water sample data2015-06-12 02:19:0057.48283 N, 11.53241 WRRS Discovery DY031
1764556CTD or STD cast2016-06-16 10:53:4257.4824 N, 11.5344 WRRS Discovery DY052
1765688Currents -subsurface Eulerian2016-06-16 10:54:1057.48235 N, 11.5344 WRRS Discovery DY052
1874889Water sample data2016-06-16 11:52:0057.48235 N, 11.5344 WRRS Discovery DY052