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Metadata Report for BODC Series Reference Number 1722363


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_053
BODC Series Reference 1722363
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-12 01:28
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.48282 N ( 57° 29.0' N )
Longitude 11.53242 W ( 11° 31.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 2000.0 m
Minimum Sensor or Sampling Height 18.0 m
Maximum Sensor or Sampling Height 2013.0 m
Sea Floor Depth 2018.0 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 = 1722363

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 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
1929930Currents -subsurface Eulerian2010-05-19 17:23:5757.4826 N, 11.5337 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
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