Metadata Report for BODC Series Reference Number 1722387


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_055
BODC Series Reference 1722387
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-12 23:17
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.44992 N ( 57° 27.0' N )
Longitude 11.08358 W ( 11° 5.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 575.0 m
Minimum Sensor or Sampling Height 17.0 m
Maximum Sensor or Sampling Height 587.0 m
Sea Floor Depth 592.0 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 = 1722387

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 J
CategoryOffshore location
Latitude57° 27.00' N
Longitude11° 4.98' W
Water depth below MSL550.0 m

Ellett Line/Extended Ellett Line: Station J

Station J 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 J 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 J

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
89962CTD or STD cast1975-05-04 14:30:0057.455 N, 11.0583 WRRS Challenger CH7A/75
89311CTD or STD cast1975-07-06 03:27:0057.45 N, 11.0833 WRRS Challenger CH10A/75
90188CTD or STD cast1975-11-09 04:13:0057.4483 N, 11.08 WRRS Challenger CH14A/75
90508CTD or STD cast1976-04-02 13:00:0057.4483 N, 11.085 WRRS Challenger CH5A/76
91247CTD or STD cast1976-05-22 13:46:0057.4483 N, 11.0833 WRRS Challenger CH8/76
90951CTD or STD cast1977-03-06 23:20:0057.4566 N, 11.105 WRRS Challenger CH4/77
92030CTD or STD cast1977-04-16 01:29:0057.4466 N, 11.0866 WRRS Challenger CH6B/77
94189CTD or STD cast1977-07-24 05:03:0057.4466 N, 11.0733 WRRS Challenger CH11/77
88762CTD or STD cast1977-08-22 08:19:0057.435 N, 11.0816 WRRS Challenger CH13/77
92496CTD or STD cast1978-02-07 01:50:0057.4583 N, 11.1066 WRRS Challenger CH2/78
95273CTD or STD cast1978-06-05 17:55:0057.4516 N, 11.085 WRRS Challenger CH9/78
186050CTD or STD cast1978-08-10 00:40:0057.4516 N, 11.0833 WRRS Challenger CH11B/78
190835CTD or STD cast1978-09-12 14:00:0057.45 N, 11.0833 WRRS Challenger CH11D/78
314397CTD or STD cast1978-11-07 23:16:0057.4533 N, 11.0967 WRRS Challenger CH14B/78
98652CTD or STD cast1979-05-20 17:09:0057.4483 N, 11.0816 WRRS Challenger CH7/79
187587CTD or STD cast1980-03-02 14:59:0057.45 N, 11.085 WRRS Challenger CH4/80
188911CTD or STD cast1980-05-04 13:48:0057.45 N, 11.085 WRRS Challenger CH7/80
188357CTD or STD cast1981-04-20 12:10:0057.45 N, 11.0833 WRRS Challenger CH6B/81
187145CTD or STD cast1981-10-15 01:00:0057.45 N, 11.0833 WRRS Challenger CH15/81
189281CTD or STD cast1982-04-29 15:02:0057.4483 N, 11.085 WRRS Challenger CH7A/82
189489CTD or STD cast1982-05-09 13:25:0057.4483 N, 11.0816 WRRS Challenger CH7B/82
193581CTD or STD cast1983-05-25 23:47:0057.4483 N, 11.085 WRRS Challenger CH7B/83
96995CTD or STD cast1983-08-18 04:08:0057.4483 N, 11.0933 WRRS Challenger CH11/83
313321CTD or STD cast1984-06-28 15:26:0057.4483 N, 11.085 WRRS Challenger CH2/84
258314CTD or STD cast1985-01-26 05:47:0057.445 N, 11.0983 WRRS Challenger CH1/85
253985CTD or STD cast1985-05-09 07:24:0057.4466 N, 11.09 WRRS Challenger CH4/85
261291CTD or STD cast1985-08-21 05:21:0057.4483 N, 11.0816 WRRS Challenger CH8/85
264252CTD or STD cast1987-01-11 01:45:0057.45 N, 11.0833 WRRS Challenger CH9
250489CTD or STD cast1987-04-29 00:39:0057.45 N, 11.0833 WRRS Challenger CH14
263875CTD or STD cast1988-06-19 19:39:0057.45 N, 11.0833 WRRS Challenger CH30
265440CTD or STD cast1989-01-25 09:16:0057.45 N, 11.0833 WRRS Discovery D180
265949CTD or STD cast1989-05-06 19:29:0057.45 N, 11.0833 WRV Lough Foyle LF1/89
317727CTD or STD cast1989-08-05 22:14:0057.4483 N, 11.0817 WRV Lough Foyle LF2/89
316908CTD or STD cast1989-11-26 17:51:0057.45 N, 11.0833 WRRS Charles Darwin CD44
314999CTD or STD cast1990-06-27 17:17:0057.45 N, 11.085 WRRS Challenger CH67A
259759CTD or STD cast1990-09-01 22:11:0057.45 N, 11.0833 WRRS Challenger CH71A
382597CTD or STD cast1991-02-27 15:10:0057.45 N, 11.0833 WRRS Challenger CH75B
316299CTD or STD cast1991-07-03 08:39:0057.4517 N, 11.0817 WRRS Challenger CH81
386574CTD or STD cast1992-09-27 23:25:0057.4483 N, 11.0833 WRRS Challenger CH97
385651CTD or STD cast1993-05-15 15:19:0057.4483 N, 11.0833 WRRS Challenger CH103
387786CTD or STD cast1993-09-06 14:37:0057.443 N, 11.0845 WRRS Challenger CH105
389130CTD or STD cast1994-03-19 06:16:0057.45 N, 11.0833 WRRS Challenger CH110
389258CTD or STD cast1994-05-02 21:52:0057.45 N, 11.0833 WRRS Challenger CH112
390917CTD or STD cast1994-08-18 11:50:0057.45 N, 11.0735 WRRS Challenger CH114
392070CTD or STD cast1994-11-25 22:21:0057.45 N, 11.0833 WRRS Challenger CH116
435182CTD or STD cast1995-04-22 16:33:0057.45 N, 11.0833 WRRS Charles Darwin CD92B
435330CTD or STD cast1995-04-28 19:54:0057.45 N, 11.0833 WRRS Charles Darwin CD92B
390536CTD or STD cast1995-07-31 17:46:0057.45 N, 11.0843 WRRS Challenger CH120
434130CTD or STD cast1996-01-13 19:49:0057.45 N, 11.0833 WRRS Challenger CH124
434314CTD or STD cast1996-01-16 18:15:0057.45 N, 11.0833 WRRS Challenger CH124
1014656CTD or STD cast1996-10-02 01:21:0057.44983 N, 11.09733 WRRS Discovery D223A
1850156Water sample data1996-10-02 01:57:0057.44979 N, 11.09737 WRRS Discovery D223A
1008024CTD or STD cast1997-09-13 20:17:0057.44933 N, 11.08067 WRRS Discovery D230
1305005Water sample data1997-09-13 20:41:0057.44928 N, 11.08072 WRRS Discovery D230
1020637CTD or STD cast1998-05-26 03:19:0057.4535 N, 11.08667 WRRS Discovery D233
1306278Water sample data1998-05-26 03:44:0057.45353 N, 11.08664 WRRS Discovery D233
1849444Water sample data1998-05-26 03:44:0057.45353 N, 11.08664 WRRS Discovery D233
1076979CTD or STD cast1999-06-01 06:04:0057.45483 N, 11.083 WNot applicable
1070738CTD or STD cast1999-09-12 23:32:0057.44367 N, 11.07367 WRRS Discovery D242
1252064Water sample data1999-09-12 23:45:0057.44367 N, 11.07367 WRRS Discovery D242
1075233CTD or STD cast2000-02-04 21:49:0057.44967 N, 11.05433 WRRS Discovery D245
559124CTD or STD cast2000-05-18 11:18:0057.445 N, 11.0817 WFRV Scotia 0700S
676872CTD or STD cast2001-05-21 06:02:0057.45133 N, 11.07967 WRRS Discovery D253
626783CTD or STD cast2003-04-18 14:30:0057.4478 N, 11.083 WFRV Scotia 0703S
844964CTD or STD cast2003-07-22 13:53:0057.4503 N, 11.084 WFS Poseidon PO300_2
667149CTD or STD cast2004-07-14 05:23:0057.45317 N, 11.081 WFS Poseidon PO314
896482CTD or STD cast2005-10-11 10:12:0057.44982 N, 11.0817 WRRS Charles Darwin CD176
776584CTD or STD cast2006-10-25 04:39:3757.45133 N, 11.08883 WRRS Discovery D312
847440CTD or STD cast2007-08-29 13:53:4457.44771 N, 11.09263 WRRS Discovery D321B
880836CTD or STD cast2008-05-22 11:25:0057.44867 N, 11.083 WFRV Scotia 0508S
1616854Water sample data2008-05-22 11:25:0057.44867 N, 11.083 WFRV Scotia 0508S
954289CTD or STD cast2009-06-19 15:47:3057.44932 N, 11.0802 WRRS Discovery D340A
1052744CTD or STD cast2010-05-19 23:02:4457.45183 N, 11.08467 WRRS Discovery D351
1896781Water sample data2010-05-19 23:30:0057.45148 N, 11.08587 WRRS Discovery D351
1195769CTD or STD cast2011-05-30 18:42:1457.4505 N, 11.07717 WRRS Discovery D365
1203532CTD or STD cast2012-08-04 14:59:0057.45007 N, 11.08348 WRRS Discovery D379
1220406CTD or STD cast2013-05-19 17:51:5257.4497 N, 11.082 WRRS James Cook JC086
1371167CTD or STD cast2014-07-15 10:33:4457.4501 N, 11.0829 WRRS James Clark Ross JR20140531 (JR302)
1723298CTD or STD cast2015-06-12 23:16:2657.4495 N, 11.0837 WRRS Discovery DY031
1879243Water sample data2015-06-12 23:38:0057.44866 N, 11.08384 WRRS Discovery DY031
1764581CTD or STD cast2016-06-16 16:28:5457.4491 N, 11.0832 WRRS Discovery DY052
1765719Currents -subsurface Eulerian2016-06-16 16:29:0257.44907 N, 11.08296 WRRS Discovery DY052
1874908Water sample data2016-06-16 16:48:0057.44905 N, 11.08289 WRRS Discovery DY052