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Metadata Report for BODC Series Reference Number 1722375


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_054
BODC Series Reference 1722375
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-12 04:25
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.46640 N ( 57° 28.0' N )
Longitude 11.31666 W ( 11° 19.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 735.0 m
Minimum Sensor or Sampling Height 21.0 m
Maximum Sensor or Sampling Height 751.0 m
Sea Floor Depth 756.0 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 = 1722375

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 I
CategoryOffshore location
Latitude57° 28.02' N
Longitude11° 19.02' W
Water depth below MSL750.0 m

Ellett Line/Extended Ellett Line: Station I

Station I 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 I 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 I

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
89974CTD or STD cast1975-05-04 18:00:0057.4666 N, 11.3166 WRRS Challenger CH7A/75
89323CTD or STD cast1975-07-06 04:50:0057.4666 N, 11.3166 WRRS Challenger CH10A/75
90207CTD or STD cast1975-11-09 06:04:0057.46 N, 11.3166 WRRS Challenger CH14A/75
90490CTD or STD cast1976-04-02 11:31:0057.465 N, 11.315 WRRS Challenger CH5A/76
91259CTD or STD cast1976-05-22 16:10:0057.4633 N, 11.3566 WRRS Challenger CH8/76
92042CTD or STD cast1977-04-16 02:55:0057.4666 N, 11.3166 WRRS Challenger CH6B/77
94177CTD or STD cast1977-07-24 03:15:0057.4666 N, 11.3166 WRRS Challenger CH11/77
88774CTD or STD cast1977-08-22 10:11:0057.4533 N, 11.3233 WRRS Challenger CH13/77
92380CTD or STD cast1978-02-05 11:35:0057.465 N, 11.3183 WRRS Challenger CH2/78
92484CTD or STD cast1978-02-07 00:10:0057.4733 N, 11.3233 WRRS Challenger CH2/78
95261CTD or STD cast1978-06-05 16:30:0057.4666 N, 11.315 WRRS Challenger CH9/78
186049CTD or STD cast1978-08-09 23:06:0057.475 N, 11.3083 WRRS Challenger CH11B/78
190823CTD or STD cast1978-09-12 12:27:0057.4533 N, 11.3133 WRRS Challenger CH11D/78
187563CTD or STD cast1980-03-02 12:11:0057.4666 N, 11.3183 WRRS Challenger CH4/80
188892CTD or STD cast1980-05-04 12:08:0057.465 N, 11.3166 WRRS Challenger CH7/80
188345CTD or STD cast1981-04-20 10:25:0057.4666 N, 11.315 WRRS Challenger CH6B/81
187133CTD or STD cast1981-10-14 23:26:0057.4666 N, 11.31 WRRS Challenger CH15/81
189293CTD or STD cast1982-04-29 16:14:0057.4666 N, 11.3183 WRRS Challenger CH7A/82
189477CTD or STD cast1982-05-09 11:59:0057.465 N, 11.315 WRRS Challenger CH7B/82
193593CTD or STD cast1983-05-26 01:16:0057.465 N, 11.3183 WRRS Challenger CH7B/83
96983CTD or STD cast1983-08-18 02:34:0057.4666 N, 11.3116 WRRS Challenger CH11/83
313333CTD or STD cast1984-06-28 16:56:0057.4667 N, 11.32 WRRS Challenger CH2/84
257452CTD or STD cast1984-11-21 23:13:0057.4666 N, 11.3166 WRRS Challenger CH10/84
253997CTD or STD cast1985-05-09 08:57:0057.4683 N, 11.315 WRRS Challenger CH4/85
264264CTD or STD cast1987-01-11 03:12:0057.4666 N, 11.3166 WRRS Challenger CH9
250477CTD or STD cast1987-04-28 23:04:0057.4666 N, 11.31 WRRS Challenger CH14
263863CTD or STD cast1988-06-19 18:14:0057.465 N, 11.315 WRRS Challenger CH30
265452CTD or STD cast1989-01-25 10:42:0057.4666 N, 11.3166 WRRS Discovery D180
265950CTD or STD cast1989-05-06 20:40:0057.4666 N, 11.3166 WRV Lough Foyle LF1/89
317739CTD or STD cast1989-08-05 23:23:0057.4667 N, 11.3167 WRV Lough Foyle LF2/89
316921CTD or STD cast1989-11-26 19:17:0057.4667 N, 11.315 WRRS Charles Darwin CD44
314987CTD or STD cast1990-06-27 15:51:0057.4667 N, 11.3167 WRRS Challenger CH67A
259747CTD or STD cast1990-09-01 20:40:0057.4666 N, 11.3166 WRRS Challenger CH71A
382604CTD or STD cast1991-02-27 16:49:0057.465 N, 11.3167 WRRS Challenger CH75B
316306CTD or STD cast1991-07-03 10:09:0057.4667 N, 11.3183 WRRS Challenger CH81
386586CTD or STD cast1992-09-28 01:01:0057.4667 N, 11.3167 WRRS Challenger CH97
385638CTD or STD cast1993-05-15 13:37:0057.4667 N, 11.3167 WRRS Challenger CH103
387774CTD or STD cast1993-09-06 12:38:0057.4683 N, 11.3072 WRRS Challenger CH105
389246CTD or STD cast1994-05-02 19:38:0057.4667 N, 11.3167 WRRS Challenger CH112
390929CTD or STD cast1994-08-18 14:34:0057.4668 N, 11.3065 WRRS Challenger CH114
392082CTD or STD cast1994-11-25 23:49:0057.4672 N, 11.3163 WRRS Challenger CH116
435194CTD or STD cast1995-04-24 15:25:0057.4667 N, 11.3167 WRRS Charles Darwin CD92B
435305CTD or STD cast1995-04-28 11:34:0057.4667 N, 11.3167 WRRS Charles Darwin CD92B
390548CTD or STD cast1995-07-31 20:17:0057.465 N, 11.3147 WRRS Challenger CH120
434142CTD or STD cast1996-01-13 21:33:0057.4667 N, 11.3167 WRRS Challenger CH124
1014668CTD or STD cast1996-10-02 03:23:0057.47267 N, 11.31567 WRRS Discovery D223A
1850168Water sample data1996-10-02 04:00:0057.4726 N, 11.31563 WRRS Discovery D223A
1070751CTD or STD cast1999-09-13 01:53:0057.46617 N, 11.30867 WRRS Discovery D242
1252076Water sample data1999-09-13 02:08:0057.46617 N, 11.30867 WRRS Discovery D242
1075245CTD or STD cast2000-02-05 05:17:0057.47 N, 11.31167 WRRS Discovery D245
559112CTD or STD cast2000-05-18 09:51:0057.465 N, 11.315 WFRV Scotia 0700S
1230437Water sample data2000-05-18 09:51:0057.466 N, 11.31517 WFRV Scotia 0700S
676884CTD or STD cast2001-05-21 07:44:0057.47233 N, 11.31033 WRRS Discovery D253
626795CTD or STD cast2003-04-18 15:49:0057.4663 N, 11.3188 WFRV Scotia 0703S
844952CTD or STD cast2003-07-22 12:02:0057.46607 N, 11.31728 WFS Poseidon PO300_2
667150CTD or STD cast2004-07-14 07:48:0057.4665 N, 11.31467 WFS Poseidon PO314
896494CTD or STD cast2005-10-11 14:49:0057.46712 N, 11.31926 WRRS Charles Darwin CD176
776572CTD or STD cast2006-10-25 00:12:4757.46533 N, 11.3255 WRRS Discovery D312
847439CTD or STD cast2007-08-29 11:31:0157.46562 N, 11.31602 WRRS Discovery D321B
880824CTD or STD cast2008-05-22 09:34:0057.46267 N, 11.31817 WFRV Scotia 0508S
1616842Water sample data2008-05-22 09:34:0057.46267 N, 11.31817 WFRV Scotia 0508S
954277CTD or STD cast2009-06-19 13:12:5457.46734 N, 11.32071 WRRS Discovery D340A
1052732CTD or STD cast2010-05-19 20:40:4657.47133 N, 11.32583 WRRS Discovery D351
1929942Currents -subsurface Eulerian2010-05-19 20:41:2457.4686 N, 11.3211 WRRS Discovery D351
1896768Water sample data2010-05-19 21:17:0057.47156 N, 11.3296 WRRS Discovery D351
1195757CTD or STD cast2011-05-30 16:53:5757.46817 N, 11.31217 WRRS Discovery D365
1203544CTD or STD cast2012-08-04 17:29:0057.46795 N, 11.3099 WRRS Discovery D379
1220399CTD or STD cast2013-05-19 15:43:0457.4708 N, 11.3158 WRRS James Cook JC086
1371155CTD or STD cast2014-07-15 08:48:0457.4677 N, 11.3171 WRRS James Clark Ross JR20140531 (JR302)
1723286CTD or STD cast2015-06-12 04:24:4657.4664 N, 11.3166 WRRS Discovery DY031
1879231Water sample data2015-06-12 04:48:0057.46641 N, 11.31665 WRRS Discovery DY031
1764568CTD or STD cast2016-06-16 14:05:4657.4666 N, 11.3178 WRRS Discovery DY052
1765707Currents -subsurface Eulerian2016-06-16 14:06:0657.4666 N, 11.31776 WRRS Discovery DY052
1874890Water sample data2016-06-16 14:31:0057.4666 N, 11.31776 WRRS Discovery DY052