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Metadata Report for BODC Series Reference Number 1722523


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_067
BODC Series Reference 1722523
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 10:24
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.05003 N ( 57° 3.0' N )
Longitude 9.21824 W ( 9° 13.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 305.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 314.0 m
Sea Floor Depth 319.0 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 = 1722523

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 Q
CategoryOffshore location
Latitude57° 3.00' N
Longitude9° 13.02' W
Water depth below MSL350.0 m

Ellett Line/Extended Ellett Line: Station Q

Station Q 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 Q 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 Q

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
89231CTD or STD cast1975-07-05 03:45:0057.0483 N, 9.2066 WRRS Challenger CH10A/75
90115CTD or STD cast1975-11-08 12:12:0057.045 N, 9.2516 WRRS Challenger CH14A/75
90397CTD or STD cast1975-11-11 09:15:0057.05 N, 9.2166 WRRS Challenger CH14A/75
91155CTD or STD cast1976-05-21 03:50:0057.0616 N, 9.2333 WRRS Challenger CH8/76
91966CTD or STD cast1977-04-15 03:58:0057.0516 N, 9.2283 WRRS Challenger CH6B/77
93358CTD or STD cast1977-06-30 05:00:0057.0266 N, 9.2183 WRRS Challenger CH10/77
94269CTD or STD cast1977-07-24 20:40:0057.0466 N, 9.2266 WRRS Challenger CH11/77
88694CTD or STD cast1977-08-21 16:05:0057.045 N, 9.2316 WRRS Challenger CH13/77
92287CTD or STD cast1978-02-03 04:20:0057.05 N, 9.2166 WRRS Challenger CH2/78
92564CTD or STD cast1978-02-07 16:10:0057.0516 N, 9.23 WRRS Challenger CH2/78
94860CTD or STD cast1978-04-20 00:33:0057.05 N, 9.2516 WRRS Challenger CH6/78
95341CTD or STD cast1978-06-06 15:07:0057.0466 N, 9.2133 WRRS Challenger CH9/78
186129CTD or STD cast1978-08-10 20:13:0057.065 N, 9.215 WRRS Challenger CH11B/78
98732CTD or STD cast1979-05-21 16:00:0057.05 N, 9.2166 WRRS Challenger CH7/79
99815CTD or STD cast1979-06-27 17:53:0057.0433 N, 9.1833 WRRS Shackleton S5/79
95906CTD or STD cast1979-09-14 04:44:0057.0466 N, 9.2083 WRRS Challenger CH13/79
96092CTD or STD cast1979-10-29 21:14:0057.0566 N, 9.2416 WRRS Challenger CH16/79
187723CTD or STD cast1980-03-03 23:32:0057.0516 N, 9.2316 WRRS Challenger CH4/80
189023CTD or STD cast1980-05-05 06:33:0057.0533 N, 9.21 WRRS Challenger CH7/80
312667CTD or STD cast1981-01-29 22:37:0057.05 N, 9.217 WRRS Challenger CH2/81
187907CTD or STD cast1981-04-13 06:01:0057.0516 N, 9.2166 WRRS Challenger CH6A/81
188425CTD or STD cast1981-04-21 02:05:0057.0516 N, 9.2183 WRRS Challenger CH6B/81
192240CTD or STD cast1981-07-12 18:27:0057.0483 N, 9.215 WRRS Challenger CH10/81
187237CTD or STD cast1981-10-17 18:39:0057.0483 N, 9.2183 WRRS Challenger CH15/81
189164CTD or STD cast1982-04-27 05:06:0057.035 N, 9.2116 WRRS Challenger CH7A/82
193464CTD or STD cast1983-05-24 18:44:0057.0466 N, 9.2083 WRRS Challenger CH7B/83
97071CTD or STD cast1983-08-19 03:45:0057.05 N, 9.2133 WRRS Challenger CH11/83
313228CTD or STD cast1984-06-27 20:53:0057.0483 N, 9.2167 WRRS Challenger CH2/84
253900CTD or STD cast1985-05-08 17:43:0057.05 N, 9.2166 WRRS Challenger CH4/85
261205CTD or STD cast1985-08-20 06:43:0057.0483 N, 9.215 WRRS Challenger CH8/85
264184CTD or STD cast1987-01-10 11:36:0057.05 N, 9.2166 WRRS Challenger CH9
250569CTD or STD cast1987-04-30 08:27:0057.05 N, 9.2166 WRRS Challenger CH14
251604CTD or STD cast1987-11-27 16:28:0057.0483 N, 9.225 WRRS Challenger CH22
266904CTD or STD cast1988-03-06 10:01:0057.0483 N, 9.215 WRRS Challenger CH25
263955CTD or STD cast1988-06-20 10:36:0057.05 N, 9.215 WRRS Challenger CH30
265372CTD or STD cast1989-01-24 16:20:0057.05 N, 9.2166 WRRS Discovery D180
265870CTD or STD cast1989-05-06 05:55:0057.05 N, 9.2166 WRV Lough Foyle LF1/89
317659CTD or STD cast1989-08-05 09:54:0057.05 N, 9.2167 WRV Lough Foyle LF2/89
316828CTD or STD cast1989-11-26 01:58:0057.05 N, 9.2133 WRRS Charles Darwin CD44
315075CTD or STD cast1990-06-28 06:44:0057.05 N, 9.2167 WRRS Challenger CH67A
259827CTD or STD cast1990-09-02 14:24:0057.05 N, 9.2166 WRRS Challenger CH71A
382512CTD or STD cast1991-02-26 20:18:0057.0483 N, 9.2167 WRRS Challenger CH75B
316214CTD or STD cast1991-07-02 16:52:0057.05 N, 9.2167 WRRS Challenger CH81
386501CTD or STD cast1992-09-26 21:43:0057.05 N, 9.2167 WRRS Challenger CH97
385362CTD or STD cast1993-03-15 07:33:0057.0483 N, 9.22 WRRS Challenger CH101B
385731CTD or STD cast1993-05-17 05:34:0057.0383 N, 9.2217 WRRS Challenger CH103
385780CTD or STD cast1993-05-17 11:56:0057.05 N, 9.2217 WRRS Challenger CH103
387891CTD or STD cast1993-09-08 22:19:0057.0515 N, 9.2188 WRRS Challenger CH105
389086CTD or STD cast1994-03-18 01:23:0057.05 N, 9.2167 WRRS Challenger CH110
389338CTD or STD cast1994-05-04 04:44:0057.05 N, 9.2167 WRRS Challenger CH112
389479CTD or STD cast1994-05-08 03:30:0057.05 N, 9.2167 WRRS Challenger CH112
390825CTD or STD cast1994-08-16 18:26:0057.05 N, 9.2167 WRRS Challenger CH114
391982CTD or STD cast1994-11-24 17:12:0057.05 N, 9.2167 WRRS Challenger CH116
434720CTD or STD cast1995-04-15 15:33:0057.05 N, 9.2167 WRRS Charles Darwin CD92B
435422CTD or STD cast1995-04-30 11:59:0057.05 N, 9.2167 WRRS Charles Darwin CD92B
390432CTD or STD cast1995-07-30 10:23:0057.0502 N, 9.2175 WRRS Challenger CH120
434049CTD or STD cast1996-01-12 19:03:0057.05 N, 9.2167 WRRS Challenger CH124
1289347Water sample data1996-01-12 19:03:0057.05 N, 9.2167 WRRS Challenger CH124
1014576CTD or STD cast1996-09-30 19:57:0057.05367 N, 9.213 WRRS Discovery D223A
1850076Water sample data1996-09-30 20:21:0057.05362 N, 9.213 WRRS Discovery D223A
1008073CTD or STD cast1997-09-14 10:06:0057.0495 N, 9.21183 WRRS Discovery D230
1305042Water sample data1997-09-14 10:22:0057.04942 N, 9.21191 WRRS Discovery D230
1020674CTD or STD cast1998-05-26 17:02:0057.05233 N, 9.215 WRRS Discovery D233
1306322Water sample data1998-05-26 17:20:0057.05228 N, 9.21497 WRRS Discovery D233
1849493Water sample data1998-05-26 17:20:0057.05228 N, 9.21497 WRRS Discovery D233
1077111CTD or STD cast1999-06-04 15:01:0057.0465 N, 9.21967 WNot applicable
1070634CTD or STD cast1999-09-11 18:37:0057.0545 N, 9.22633 WRRS Discovery D242
1251964Water sample data1999-09-11 18:45:0057.0545 N, 9.22633 WRRS Discovery D242
1075128CTD or STD cast2000-02-03 10:44:0057.04433 N, 9.22183 WRRS Discovery D245
559204CTD or STD cast2000-05-19 03:33:0057.0517 N, 9.2133 WFRV Scotia 0700S
1230474Water sample data2000-05-19 03:33:0057.053 N, 9.21483 WFRV Scotia 0700S
1220861CTD or STD cast2001-05-20 08:48:0057.04667 N, 9.22333 WRRS Discovery D253
626709CTD or STD cast2003-04-17 22:08:0057.046 N, 9.2178 WFRV Scotia 0703S
845064CTD or STD cast2003-07-24 15:11:0057.0511 N, 9.21573 WFS Poseidon PO300_2
667070CTD or STD cast2004-07-13 04:45:0057.04933 N, 9.22033 WFS Poseidon PO314
896408CTD or STD cast2005-10-08 05:44:0057.05385 N, 9.21071 WRRS Charles Darwin CD176
776652CTD or STD cast2006-10-26 05:16:3557.051 N, 9.21967 WRRS Discovery D312
847507CTD or STD cast2007-08-30 12:35:3157.04918 N, 9.22307 WRRS Discovery D321B
880916CTD or STD cast2008-05-23 08:11:0057.05167 N, 9.21783 WFRV Scotia 0508S
1616934Water sample data2008-05-23 08:11:0057.05167 N, 9.21783 WFRV Scotia 0508S
954369CTD or STD cast2009-06-20 14:21:5857.05152 N, 9.21351 WRRS Discovery D340A
1052812CTD or STD cast2010-05-20 20:11:0957.05067 N, 9.21083 WRRS Discovery D351
1930027Currents -subsurface Eulerian2010-05-20 20:11:4057.0505 N, 9.2141 WRRS Discovery D351
1896861Water sample data2010-05-20 20:32:0057.04959 N, 9.20755 WRRS Discovery D351
1195837CTD or STD cast2011-05-31 14:22:0757.05233 N, 9.21683 WRRS Discovery D365
1203439CTD or STD cast2012-08-03 13:27:0057.05126 N, 9.21644 WRRS Discovery D379
1220535CTD or STD cast2013-05-20 20:29:0157.05 N, 9.2166 WRRS James Cook JC086
1371247CTD or STD cast2014-07-16 04:38:5457.0751 N, 9.317 WRRS James Clark Ross JR20140531 (JR302)
1371259CTD or STD cast2014-07-16 06:17:4857.0504 N, 9.2169 WRRS James Clark Ross JR20140531 (JR302)
1723422CTD or STD cast2015-06-14 10:24:1457.05 N, 9.2182 WRRS Discovery DY031
1879347Water sample data2015-06-14 10:39:0057.05003 N, 9.21824 WRRS Discovery DY031
1764685CTD or STD cast2016-06-19 02:26:3657.0508 N, 9.2171 WRRS Discovery DY052
1765812Currents -subsurface Eulerian2016-06-19 02:26:5757.05076 N, 9.21714 WRRS Discovery DY052
1874994Water sample data2016-06-19 02:41:0057.05076 N, 9.21714 WRRS Discovery DY052