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Metadata Report for BODC Series Reference Number 1722326

Metadata Summary

Data Description

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

Data Identifiers

Originator's Identifier LADCP_050
BODC Series Reference 1722326

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-10 19:15
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars

Spatial Co-ordinates

Latitude 57.53347 N ( 57° 32.0' N )
Longitude 12.63320 W ( 12° 38.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 1625.0 m
Minimum Sensor or Sampling Height 12.0 m
Maximum Sensor or Sampling Height 1632.0 m
Sea Floor Depth 1637.0 m
Sea Floor Depth Source CTDDATA
Sensor or Sampling Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum Approximate - Depth is only approximate


No Parameters for BODC Reference Number = 1722326

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

Instrument Description

The LADCP data were collected using the instrumentation detailed below:

Sensor Model Serial Number Calibration (UT) Comments
LADCP Teledyne RDI high-power Workhorse 300kHz 15288 - LDEO unit, downward looking

One Teledyne RDI Workhorse 300kHz ADCP was mounted on the Sea-Bird 9 11 plus CTD frame pointing downward (downlooker).

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 Processing

LDEO processed data were provided by the originator in Matlab and ASCII formats. The LDEO processed data in ASCII format were converted into BODC internal format after discussion with the originator. All data provided were from the downward looking RDI 300 kHz Workhorse ADCP which was 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 Parameter Name Units Description BODC Parameter Code Units Comments
z m Depth of LADCP bin ADEPZZ01 m -
u m s-1 Eastward velocity LCEWLW01 cm s-1 Units converted from m s-1 to cm s-1 by multiplying by 100.
v m s-1 Northward velocity LCNSLW01 cm s-1 Units converted from m s-1 to cm s-1 by multiplying by 100.
ev m s-1 Uncertainty estimates of LADCP velocity profile 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.

Note that the more complex LDEO processed data are available on request in Matlab format as well as the unprocessed raw LADCP files.

Originator's Data Processing

Sampling Strategy

A total of 84 LADCP profiles were collected at all CTD stations in order to derive full-depth profiles of ocean velocity, as well as profiles of finestructure vertical shear.

Data processing

Preliminary shipboard processing of the LADCP data was carried out with the LDEO IX LADCP processing software using averaged one Hz ascii CTD data in order to correct the LADCP data for depth and sound speed.

Please refer to Thurnherr (2014) and cruise report for a more detailed processing methodology. However, please be aware that this processing guide is for software versions IX.7 to IX.10 only, and changes have been made between versions which have the potential for significantly changing the solutions.


Thurnherr, A. M., 2014. How To Process LADCP Data With the LDEO Software, Versions IX.7 - IX.10.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information


Cruise Name DY031
Departure Date 2015-05-29
Arrival Date 2015-06-17
Principal Scientist(s)N Penny Holliday (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 E
CategoryOffshore location
Latitude57° 31.98' N
Longitude12° 37.98' W
Water depth below MSL1658.0 m

Ellett Line/Extended Ellett Line: Station E

Station E 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 E 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 E

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
89360CTD or STD cast1975-07-06 15:40:0057.5233 N, 12.5633 WRRS Challenger CH10A/75
90244CTD or STD cast1975-11-09 14:32:0057.5266 N, 12.6416 WRRS Challenger CH14A/75
90453CTD or STD cast1976-04-02 02:38:0057.5333 N, 12.6333 WRRS Challenger CH5A/76
91296CTD or STD cast1976-05-23 03:25:0057.5283 N, 12.6366 WRRS Challenger CH8/76
90895CTD or STD cast1977-03-06 13:05:0057.5333 N, 12.6333 WRRS Challenger CH4/77
94128CTD or STD cast1977-07-23 17:10:0057.5133 N, 12.68 WRRS Challenger CH11/77
88817CTD or STD cast1977-08-22 19:59:0057.53 N, 12.6366 WRRS Challenger CH13/77
92447CTD or STD cast1978-02-06 15:15:0057.53 N, 12.64 WRRS Challenger CH2/78
94429CTD or STD cast1978-04-16 01:55:0057.5283 N, 12.63 WRRS Challenger CH6/78
95212CTD or STD cast1978-06-05 06:09:0057.5316 N, 12.6316 WRRS Challenger CH9/78
186001CTD or STD cast1978-08-09 14:00:0057.5333 N, 12.6333 WRRS Challenger CH11B/78
187502CTD or STD cast1980-03-02 01:15:0057.5316 N, 12.6366 WRRS Challenger CH4/80
188855CTD or STD cast1980-05-03 16:21:0057.5316 N, 12.6283 WRRS Challenger CH7/80
188290CTD or STD cast1981-04-20 00:42:0057.5333 N, 12.6333 WRRS Challenger CH6B/81
187090CTD or STD cast1981-10-14 00:53:0057.53 N, 12.6333 WRRS Challenger CH15/81
189404CTD or STD cast1982-05-08 22:58:0057.5333 N, 12.63 WRRS Challenger CH7B/82
96922CTD or STD cast1983-08-17 17:18:0057.5316 N, 12.645 WRRS Challenger CH11/83
313370CTD or STD cast1984-06-29 04:42:0057.5333 N, 12.6317 WRRS Challenger CH2/84
257372CTD or STD cast1984-11-20 23:16:0057.535 N, 12.6333 WRRS Challenger CH10/84
254036CTD or STD cast1985-05-09 18:12:0057.5333 N, 12.6333 WRRS Challenger CH4/85
261346CTD or STD cast1985-08-21 17:19:0057.5316 N, 12.6333 WRRS Challenger CH8/85
250428CTD or STD cast1987-04-28 12:50:0057.5316 N, 12.63 WRRS Challenger CH14
265507CTD or STD cast1989-01-25 20:58:0057.5333 N, 12.6166 WRRS Discovery D180
265998CTD or STD cast1989-05-07 05:35:0057.5333 N, 12.6333 WRV Lough Foyle LF1/89
317776CTD or STD cast1989-08-06 07:35:0057.5333 N, 12.6333 WRV Lough Foyle LF2/89
316969CTD or STD cast1989-11-27 05:31:0057.5333 N, 12.6317 WRRS Charles Darwin CD44
314938CTD or STD cast1990-06-27 06:16:0057.53 N, 12.6333 WRRS Challenger CH67A
259679CTD or STD cast1990-09-01 10:10:0057.5333 N, 12.6333 WRRS Challenger CH71A
259680CTD or STD cast1990-09-01 10:28:0057.5333 N, 12.6333 WRRS Challenger CH71A
259692CTD or STD cast1990-09-01 11:10:0057.5333 N, 12.6333 WRRS Challenger CH71A
382653CTD or STD cast1991-02-28 03:35:0057.5333 N, 12.6333 WRRS Challenger CH75B
316355CTD or STD cast1991-07-03 20:07:0057.5333 N, 12.6317 WRRS Challenger CH81
386629CTD or STD cast1992-09-28 12:24:0057.5333 N, 12.6333 WRRS Challenger CH97
385595CTD or STD cast1993-05-15 01:56:0057.5317 N, 12.6367 WRRS Challenger CH103
387737CTD or STD cast1993-09-05 17:18:0057.5337 N, 12.6303 WRRS Challenger CH105
389209CTD or STD cast1994-05-02 07:29:0057.5333 N, 12.6333 WRRS Challenger CH112
390966CTD or STD cast1994-08-19 05:47:0057.5333 N, 12.6333 WRRS Challenger CH114
435262CTD or STD cast1995-04-27 19:11:0057.5333 N, 12.6333 WRRS Charles Darwin CD92B
390641CTD or STD cast1995-08-01 22:41:0057.5327 N, 12.6338 WRRS Challenger CH120
434191CTD or STD cast1996-01-14 10:29:0057.5333 N, 12.6333 WRRS Challenger CH124
1014712CTD or STD cast1996-10-02 15:52:0057.53067 N, 12.61667 WRRS Discovery D223A
1850212Water sample data1996-10-02 16:40:0057.5307 N, 12.61661 WRRS Discovery D223A
1020601CTD or STD cast1998-05-25 16:32:0057.53233 N, 12.629 WRRS Discovery D233
1306242Water sample data1998-05-25 17:18:0057.5324 N, 12.62896 WRRS Discovery D233
1849419Water sample data1998-05-25 17:18:0057.5324 N, 12.62896 WRRS Discovery D233
1070799CTD or STD cast1999-09-13 16:19:0057.53333 N, 12.63633 WRRS Discovery D242
1252120Water sample data1999-09-13 16:42:0057.53333 N, 12.63633 WRRS Discovery D242
559068CTD or STD cast2000-05-17 23:16:0057.53 N, 12.6283 WFRV Scotia 0700S
1230413Water sample data2000-05-17 23:16:0057.53 N, 12.62867 WFRV Scotia 0700S
676927CTD or STD cast2001-05-21 19:42:0057.52867 N, 12.62417 WRRS Discovery D253
626838CTD or STD cast2003-04-19 00:50:0057.5323 N, 12.6315 WFRV Scotia 0703S
844927CTD or STD cast2003-07-22 00:58:0057.532 N, 12.63328 WFS Poseidon PO300_2
667198CTD or STD cast2004-07-14 21:07:0057.53317 N, 12.63183 WFS Poseidon PO314
896537CTD or STD cast2005-10-12 04:49:0057.53204 N, 12.62058 WRRS Charles Darwin CD176
776523CTD or STD cast2006-10-22 21:15:2257.53033 N, 12.62333 WRRS Discovery D312
847869CTD or STD cast2007-08-28 22:55:2657.53323 N, 12.63332 WRRS Discovery D321B
880781CTD or STD cast2008-05-21 17:32:0057.52967 N, 12.63433 WFRV Scotia 0508S
1616805Water sample data2008-05-21 17:32:0057.52967 N, 12.63433 WFRV Scotia 0508S
954228CTD or STD cast2009-06-16 18:10:3957.53186 N, 12.63257 WRRS Discovery D340A
1053551CTD or STD cast2010-05-19 07:03:0257.51567 N, 12.6725 WRRS Discovery D351
1929905Currents -subsurface Eulerian2010-05-19 07:04:0757.5189 N, 12.67 WRRS Discovery D351
1896720Water sample data2010-05-19 07:54:0057.51553 N, 12.67239 WRRS Discovery D351
1195708CTD or STD cast2011-05-30 04:09:0057.52833 N, 12.64067 WRRS Discovery D365
1203593CTD or STD cast2012-08-05 07:39:0057.53191 N, 12.62969 WRRS Discovery D379
1220351CTD or STD cast2013-05-18 20:45:1357.533 N, 12.634 WRRS James Cook JC086
1371106CTD or STD cast2014-07-14 21:35:5057.5327 N, 12.633 WRRS James Clark Ross JR20140531 (JR302)
1723249CTD or STD cast2015-06-10 19:15:3657.5335 N, 12.6332 WRRS Discovery DY031
1879187Water sample data2015-06-10 20:09:0057.53348 N, 12.6332 WRRS Discovery DY031
1764520CTD or STD cast2016-06-16 00:12:4957.5313 N, 12.6355 WRRS Discovery DY052
1765652Currents -subsurface Eulerian2016-06-16 00:13:0657.53129 N, 12.63548 WRRS Discovery DY052
1874853Water sample data2016-06-16 00:56:0057.53119 N, 12.63567 WRRS Discovery DY052
1976105CTD or STD cast2017-05-19 06:25:3557.5303 N, 12.6283 WRRS Discovery DY078 (DY079)