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Metadata Report for BODC Series Reference Number 1929929


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_035
BODC Series Reference 1929929
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-05-19 14:05
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 10.0 metres
 

Spatial Co-ordinates

Latitude 57.49750 N ( 57° 29.9' N )
Longitude 11.85090 W ( 11° 51.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 10.0 m
Maximum Sensor or Sampling Depth 1770.0 m
Minimum Sensor or Sampling Height 10.81 m
Maximum Sensor or Sampling Height 1770.82 m
Sea Floor Depth 1780.82 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 G
CategoryOffshore location
Latitude57° 29.52' N
Longitude11° 51.00' W
Water depth below MSL1812.0 m

Ellett Line/Extended Ellett Line: Station G

Station G 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 G 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 G

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
89986CTD or STD cast1975-05-04 20:30:0057.4916 N, 11.85 WRRS Challenger CH7A/75
90220CTD or STD cast1975-11-09 09:46:0057.49 N, 11.8516 WRRS Challenger CH14A/75
90477CTD or STD cast1976-04-02 07:05:0057.4933 N, 11.8566 WRRS Challenger CH5A/76
91272CTD or STD cast1976-05-22 21:50:0057.4966 N, 11.855 WRRS Challenger CH8/76
90914CTD or STD cast1977-03-06 18:00:0057.4916 N, 11.8483 WRRS Challenger CH4/77
92066CTD or STD cast1977-04-16 06:42:0057.4916 N, 11.8533 WRRS Challenger CH6B/77
94153CTD or STD cast1977-07-23 22:40:0057.4866 N, 11.8416 WRRS Challenger CH11/77
88798CTD or STD cast1977-08-22 14:21:0057.4883 N, 11.8366 WRRS Challenger CH13/77
92367CTD or STD cast1978-02-05 07:13:0057.495 N, 11.86 WRRS Challenger CH2/78
92460CTD or STD cast1978-02-06 19:47:0057.4933 N, 11.8566 WRRS Challenger CH2/78
94454CTD or STD cast1978-04-16 09:35:0057.4866 N, 11.8183 WRRS Challenger CH6/78
95236CTD or STD cast1978-06-05 12:00:0057.4883 N, 11.855 WRRS Challenger CH9/78
186025CTD or STD cast1978-08-09 19:09:0057.49 N, 11.8683 WRRS Challenger CH11B/78
190792CTD or STD cast1978-09-12 00:10:0057.4916 N, 11.85 WRRS Challenger CH11D/78
187526CTD or STD cast1980-03-02 06:23:0057.4916 N, 11.8516 WRRS Challenger CH4/80
188879CTD or STD cast1980-05-03 21:28:0057.4933 N, 11.845 WRRS Challenger CH7/80
188321CTD or STD cast1981-04-20 05:55:0057.485 N, 11.8466 WRRS Challenger CH6B/81
189348CTD or STD cast1982-05-02 00:22:0057.4883 N, 11.85 WRRS Challenger CH7A/82
189428CTD or STD cast1982-05-09 05:15:0057.495 N, 11.8416 WRRS Challenger CH7B/82
193612CTD or STD cast1983-05-26 05:06:0057.4916 N, 11.845 WRRS Challenger CH7B/83
96958CTD or STD cast1983-08-17 22:10:0057.4933 N, 11.85 WRRS Challenger CH11/83
313357CTD or STD cast1984-06-28 20:53:0057.4917 N, 11.85 WRRS Challenger CH2/84
257439CTD or STD cast1984-11-21 16:32:0057.4916 N, 11.8516 WRRS Challenger CH10/84
258302CTD or STD cast1985-01-26 02:55:0057.4833 N, 11.8666 WRRS Challenger CH1/85
254012CTD or STD cast1985-05-09 12:49:0057.4933 N, 11.8533 WRRS Challenger CH4/85
261322CTD or STD cast1985-08-21 11:27:0057.4916 N, 11.8483 WRRS Challenger CH8/85
264288CTD or STD cast1987-01-11 06:53:0057.4916 N, 11.85 WRRS Challenger CH9
265476CTD or STD cast1989-01-25 14:53:0057.5 N, 11.85 WRRS Discovery D180
317752CTD or STD cast1989-08-06 02:52:0057.4917 N, 11.85 WRV Lough Foyle LF2/89
316945CTD or STD cast1989-11-26 23:27:0057.4917 N, 11.8483 WRRS Charles Darwin CD44
314963CTD or STD cast1990-06-27 11:36:0057.4933 N, 11.845 WRRS Challenger CH67A
259723CTD or STD cast1990-09-01 15:32:0057.4833 N, 11.85 WRRS Challenger CH71A
382628CTD or STD cast1991-02-27 21:23:0057.4917 N, 11.8517 WRRS Challenger CH75B
316331CTD or STD cast1991-07-03 14:29:0057.4933 N, 11.8533 WRRS Challenger CH81
386605CTD or STD cast1992-09-28 06:17:0057.49 N, 11.8467 WRRS Challenger CH97
385614CTD or STD cast1993-05-15 07:48:0057.4933 N, 11.85 WRRS Challenger CH103
387750CTD or STD cast1993-09-06 04:52:0057.4967 N, 11.86 WRRS Challenger CH105
389222CTD or STD cast1994-05-02 13:42:0057.489 N, 11.8502 WRRS Challenger CH112
390942CTD or STD cast1994-08-18 20:59:0057.4917 N, 11.85 WRRS Challenger CH114
392101CTD or STD cast1994-11-26 04:02:0057.4888 N, 11.8263 WRRS Challenger CH116
435286CTD or STD cast1995-04-28 03:59:0057.4917 N, 11.85 WRRS Charles Darwin CD92B
390573CTD or STD cast1995-08-01 02:32:0057.4922 N, 11.8557 WRRS Challenger CH120
434166CTD or STD cast1996-01-14 03:05:0057.4917 N, 11.85 WRRS Challenger CH124
1014693CTD or STD cast1996-10-02 08:43:0057.49333 N, 11.82867 WRRS Discovery D223A
1850193Water sample data1996-10-02 09:32:0057.49339 N, 11.8287 WRRS Discovery D223A
1070775CTD or STD cast1999-09-13 08:20:0057.50217 N, 11.82067 WRRS Discovery D242
1252107Water sample data1999-09-13 08:50:0057.50217 N, 11.82067 WRRS Discovery D242
1075269CTD or STD cast2000-02-14 05:45:0057.51033 N, 11.84133 WRRS Discovery D245
559093CTD or STD cast2000-05-18 05:16:0057.495 N, 11.85 WFRV Scotia 0700S
1230425Water sample data2000-05-18 05:16:0057.49517 N, 11.85133 WFRV Scotia 0700S
676903CTD or STD cast2001-05-21 12:56:0057.49483 N, 11.8485 WRRS Discovery D253
626814CTD or STD cast2003-04-18 19:22:0057.4912 N, 11.8447 WFRV Scotia 0703S
844939CTD or STD cast2003-07-22 06:19:0057.49387 N, 11.85482 WFS Poseidon PO300_2
667174CTD or STD cast2004-07-14 13:31:0057.48933 N, 11.85067 WFS Poseidon PO314
896513CTD or STD cast2005-10-11 21:15:0057.49164 N, 11.85016 WRRS Charles Darwin CD176
776559CTD or STD cast2006-10-24 14:52:0157.48767 N, 11.846 WRRS Discovery D312
847427CTD or STD cast2007-08-29 05:36:2457.48902 N, 11.84798 WRRS Discovery D321B
880800CTD or STD cast2008-05-22 00:52:0057.49217 N, 11.85217 WFRV Scotia 0508S
1616829Water sample data2008-05-22 00:52:0057.49217 N, 11.85217 WFRV Scotia 0508S
954253CTD or STD cast2009-06-17 12:04:4657.49962 N, 11.84389 WRRS Discovery D340A
1052719CTD or STD cast2010-05-19 14:05:0657.4975 N, 11.85033 WRRS Discovery D351
1896744Water sample data2010-05-19 14:58:0057.49858 N, 11.85285 WRRS Discovery D351
1195733CTD or STD cast2011-05-30 10:37:4757.492 N, 11.8495 WRRS Discovery D365
1203568CTD or STD cast2012-08-05 00:05:0057.49225 N, 11.85052 WRRS Discovery D379
1220375CTD or STD cast2013-05-19 04:23:4657.4917 N, 11.8499 WRRS James Cook JC086
1371131CTD or STD cast2014-07-15 03:30:5257.492 N, 11.8499 WRRS James Clark Ross JR20140531 (JR302)
1723262CTD or STD cast2015-06-11 02:01:3657.4915 N, 11.8483 WRRS Discovery DY031
1722351Currents -subsurface Eulerian2015-06-11 02:02:1657.49152 N, 11.8483 WRRS Discovery DY031
1879206Water sample data2015-06-11 02:55:0057.49152 N, 11.84826 WRRS Discovery DY031
1764544CTD or STD cast2016-06-16 07:28:2057.4915 N, 11.8513 WRRS Discovery DY052
1765676Currents -subsurface Eulerian2016-06-16 07:28:3057.49149 N, 11.85128 WRRS Discovery DY052
1874877Water sample data2016-06-16 08:20:0057.49149 N, 11.85129 WRRS Discovery DY052