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Metadata Report for BODC Series Reference Number 1722338


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 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_051
BODC Series Reference 1722338
 

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 57.50860 N ( 57° 30.5' N )
Longitude 12.24918 W ( 12° 15.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 1820.0 m
Minimum Sensor or Sampling Height -29.0 m
Maximum Sensor or Sampling Height 1786.0 m
Sea Floor Depth 1791.0 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
 

Parameters

No Parameters for BODC Reference Number = 1722338

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.

References

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

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 F
CategoryOffshore location
Latitude57° 30.48' N
Longitude12° 15.00' W
Water depth below MSL1817.0 m

Ellett Line/Extended Ellett Line: Station F

Station F 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 F 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 F

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
89998CTD or STD cast1975-05-05 00:17:0057.5 N, 12.25 WRRS Challenger CH7A/75
89359CTD or STD cast1975-07-06 12:27:0057.5 N, 12.25 WRRS Challenger CH10A/75
90232CTD or STD cast1975-11-09 12:01:0057.5066 N, 12.2466 WRRS Challenger CH14A/75
90465CTD or STD cast1976-04-02 04:53:0057.5183 N, 12.2483 WRRS Challenger CH5A/76
91284CTD or STD cast1976-05-23 00:57:0057.5116 N, 12.2466 WRRS Challenger CH8/76
90902CTD or STD cast1977-03-06 15:25:0057.5083 N, 12.245 WRRS Challenger CH4/77
94141CTD or STD cast1977-07-23 20:10:0057.51 N, 12.2333 WRRS Challenger CH11/77
88805CTD or STD cast1977-08-22 17:11:0057.5133 N, 12.2483 WRRS Challenger CH13/77
94442CTD or STD cast1978-04-16 05:58:0057.5083 N, 12.25 WRRS Challenger CH6/78
95224CTD or STD cast1978-06-05 09:00:0057.505 N, 12.2683 WRRS Challenger CH9/78
186013CTD or STD cast1978-08-09 16:42:0057.5116 N, 12.245 WRRS Challenger CH11B/78
190780CTD or STD cast1978-09-11 21:30:0057.5033 N, 12.2516 WRRS Challenger CH11D/78
187514CTD or STD cast1980-03-02 03:48:0057.5066 N, 12.2483 WRRS Challenger CH4/80
188867CTD or STD cast1980-05-03 19:47:0057.51 N, 12.2566 WRRS Challenger CH7/80
188308CTD or STD cast1981-04-20 03:11:0057.51 N, 12.25 WRRS Challenger CH6B/81
189336CTD or STD cast1982-05-01 21:15:0057.51 N, 12.2466 WRRS Challenger CH7A/82
189416CTD or STD cast1982-05-09 02:20:0057.5066 N, 12.2483 WRRS Challenger CH7B/82
193624CTD or STD cast1983-05-26 07:45:0057.5083 N, 12.25 WRRS Challenger CH7B/83
96934CTD or STD cast1983-08-17 19:30:0057.5066 N, 12.2483 WRRS Challenger CH11/83
96946CTD or STD cast1983-08-17 19:30:0057.5066 N, 12.2483 WRRS Challenger CH11/83
313369CTD or STD cast1984-06-28 23:48:0057.5117 N, 12.2333 WRRS Challenger CH2/84
257427CTD or STD cast1984-11-21 13:13:0057.5066 N, 12.2466 WRRS Challenger CH10/84
258295CTD or STD cast1985-01-25 21:54:0057.51 N, 12.2483 WRRS Challenger CH1/85
254024CTD or STD cast1985-05-09 15:23:0057.5083 N, 12.245 WRRS Challenger CH4/85
261334CTD or STD cast1985-08-21 14:25:0057.5083 N, 12.25 WRRS Challenger CH8/85
250441CTD or STD cast1987-04-28 15:37:0057.5066 N, 12.25 WRRS Challenger CH14
265488CTD or STD cast1989-01-25 17:35:0057.5 N, 12.25 WRRS Discovery D180
265986CTD or STD cast1989-05-07 03:04:0057.5166 N, 12.25 WRV Lough Foyle LF1/89
317764CTD or STD cast1989-08-06 05:17:0057.51 N, 12.25 WRV Lough Foyle LF2/89
316957CTD or STD cast1989-11-27 02:30:0057.5083 N, 12.2483 WRRS Charles Darwin CD44
314951CTD or STD cast1990-06-27 08:52:0057.5083 N, 12.2517 WRRS Challenger CH67A
259711CTD or STD cast1990-09-01 12:49:0057.5166 N, 12.25 WRRS Challenger CH71A
382641CTD or STD cast1991-02-28 00:26:0057.5067 N, 12.2517 WRRS Challenger CH75B
316343CTD or STD cast1991-07-03 17:22:0057.5067 N, 12.2533 WRRS Challenger CH81
386617CTD or STD cast1992-09-28 09:38:0057.5083 N, 12.2517 WRRS Challenger CH97
385602CTD or STD cast1993-05-15 04:50:0057.5067 N, 12.2467 WRRS Challenger CH103
387749CTD or STD cast1993-09-05 21:30:0057.5065 N, 12.253 WRRS Challenger CH105
389210CTD or STD cast1994-05-02 10:47:0057.5083 N, 12.25 WRRS Challenger CH112
390954CTD or STD cast1994-08-19 00:17:0057.5048 N, 12.2423 WRRS Challenger CH114
435274CTD or STD cast1995-04-28 00:21:0057.5083 N, 12.25 WRRS Charles Darwin CD92B
390585CTD or STD cast1995-08-01 06:00:0057.5083 N, 12.25 WRRS Challenger CH120
434178CTD or STD cast1996-01-14 07:11:0057.5083 N, 12.25 WRRS Challenger CH124
1014700CTD or STD cast1996-10-02 11:56:0057.51867 N, 12.24833 WRRS Discovery D223A
1850200Water sample data1996-10-02 12:53:0057.51872 N, 12.24839 WRRS Discovery D223A
1008000CTD or STD cast1997-09-13 12:03:0057.50433 N, 12.26683 WRRS Discovery D230
1304978Water sample data1997-09-13 12:48:0057.5044 N, 12.26681 WRRS Discovery D230
1020613CTD or STD cast1998-05-25 19:21:0057.52017 N, 12.24517 WRRS Discovery D233
1306254Water sample data1998-05-25 20:16:0057.52023 N, 12.24524 WRRS Discovery D233
1849420Water sample data1998-05-25 20:16:0057.52023 N, 12.24524 WRRS Discovery D233
1076943CTD or STD cast1999-05-30 20:19:0057.51267 N, 12.243 WNot applicable
1070787CTD or STD cast1999-09-13 12:51:0057.508 N, 12.258 WRRS Discovery D242
1252119Water sample data1999-09-13 13:18:0057.508 N, 12.258 WRRS Discovery D242
559081CTD or STD cast2000-05-18 02:08:0057.5383 N, 12.2567 WFRV Scotia 0700S
676915CTD or STD cast2001-05-21 16:11:0057.51133 N, 12.24417 WRRS Discovery D253
626826CTD or STD cast2003-04-18 21:55:0057.5098 N, 12.243 WFRV Scotia 0703S
844915CTD or STD cast2003-07-21 20:38:0057.50908 N, 12.24168 WFS Poseidon PO300_2
667186CTD or STD cast2004-07-14 16:45:0057.517 N, 12.248 WFS Poseidon PO314
896525CTD or STD cast2005-10-12 01:17:0057.50902 N, 12.25014 WRRS Charles Darwin CD176
776547CTD or STD cast2006-10-24 08:56:1957.5125 N, 12.25267 WRRS Discovery D312
847415CTD or STD cast2007-08-29 02:26:0357.51132 N, 12.25122 WRRS Discovery D321B
880793CTD or STD cast2008-05-21 20:49:0057.50067 N, 12.25683 WFRV Scotia 0508S
1616817Water sample data2008-05-21 20:49:0057.50067 N, 12.25683 WFRV Scotia 0508S
954241CTD or STD cast2009-06-17 08:50:3757.50962 N, 12.24236 WRRS Discovery D340A
1052707CTD or STD cast2010-05-19 10:22:3657.51867 N, 12.23917 WRRS Discovery D351
1929917Currents -subsurface Eulerian2010-05-19 10:23:4457.5171 N, 12.2487 WRRS Discovery D351
1896732Water sample data2010-05-19 11:26:0057.52135 N, 12.23791 WRRS Discovery D351
1195721CTD or STD cast2011-05-30 07:29:2157.51067 N, 12.2395 WRRS Discovery D365
1203581CTD or STD cast2012-08-05 04:01:0057.50869 N, 12.24728 WRRS Discovery D379
1220363CTD or STD cast2013-05-19 00:25:3857.5082 N, 12.25 WRRS James Cook JC086
1371118CTD or STD cast2014-07-15 00:26:4557.508 N, 12.2495 WRRS James Clark Ross JR20140531 (JR302)
1723250CTD or STD cast2015-06-10 22:45:2857.5086 N, 12.2492 WRRS Discovery DY031
1879199Water sample data2015-06-10 23:35:0057.5086 N, 12.24916 WRRS Discovery DY031
1764532CTD or STD cast2016-06-16 03:41:3857.508 N, 12.2531 WRRS Discovery DY052
1765664Currents -subsurface Eulerian2016-06-16 03:41:5457.50803 N, 12.25306 WRRS Discovery DY052
1874865Water sample data2016-06-16 04:26:0057.50802 N, 12.25305 WRRS Discovery DY052