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Metadata Report for BODC Series Reference Number 1722535


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_068
BODC Series Reference 1722535
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 12:02
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.99980 N ( 56° 60.0' N )
Longitude 9.00090 W ( 9° 0.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 120.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 129.0 m
Sea Floor Depth 134.0 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 = 1722535

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 Quality Report

All casts were processed, although it was noted that casts shallower than 100-200 m often seemed to have problems, usually characterised as giving a profile that was significantly deeper than the true water depth. It is assumed this was due to confusing reflections at the seabed, and recommend that those profiles not be used (Casts 35, 37, 46, 47, 68-75, 79-81, 83). For more information see the cruise report page 35.


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 R
CategoryOffshore location
Latitude57° 0.00' N
Longitude9° 0.00' W
Water depth below MSL135.0 m

Ellett Line/Extended Ellett Line: Station R

Station R 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 R 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 R

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
89765CTD or STD cast1975-05-03 10:10:0057.0 N, 9.0 WRRS Challenger CH7A/75
89777CTD or STD cast1975-05-03 11:05:0057.0 N, 9.0 WRRS Challenger CH7A/75
89789CTD or STD cast1975-05-03 12:04:0057.0 N, 9.0 WRRS Challenger CH7A/75
89790CTD or STD cast1975-05-03 13:15:0057.0 N, 9.0 WRRS Challenger CH7A/75
89808CTD or STD cast1975-05-03 14:05:0057.0 N, 9.0 WRRS Challenger CH7A/75
89821CTD or STD cast1975-05-03 15:02:0057.0 N, 9.0 WRRS Challenger CH7A/75
89833CTD or STD cast1975-05-03 16:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89845CTD or STD cast1975-05-03 17:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89857CTD or STD cast1975-05-03 18:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89869CTD or STD cast1975-05-03 19:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89870CTD or STD cast1975-05-03 20:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89882CTD or STD cast1975-05-03 21:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89894CTD or STD cast1975-05-03 22:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
89901CTD or STD cast1975-05-03 23:00:0057.0 N, 9.0 WRRS Challenger CH7A/75
90084CTD or STD cast1975-05-05 21:20:0056.9916 N, 8.9666 WRRS Challenger CH7A/75
89218CTD or STD cast1975-07-05 02:23:0057.0 N, 9.0166 WRRS Challenger CH10A/75
89685CTD or STD cast1975-08-31 13:40:0057.0 N, 9.0 WRRS Challenger CH12A/75
90103CTD or STD cast1975-11-08 09:44:0057.0 N, 9.0016 WRRS Challenger CH14A/75
91179CTD or STD cast1976-05-21 12:00:0057.0133 N, 9.0016 WRRS Challenger CH8/76
91721CTD or STD cast1976-05-28 06:00:0057.0 N, 9.0 WRRS Challenger CH8/76
91026CTD or STD cast1977-03-07 19:45:0057.005 N, 9.0016 WRRS Challenger CH4/77
93371CTD or STD cast1977-07-03 09:46:0056.9766 N, 8.9866 WRRS Challenger CH10/77
93531CTD or STD cast1977-07-04 11:17:0057.0033 N, 8.975 WRRS Challenger CH10/77
94270CTD or STD cast1977-07-24 22:13:0056.9966 N, 9.0133 WRRS Challenger CH11/77
88682CTD or STD cast1977-08-21 14:40:0057.015 N, 9.0183 WRRS Challenger CH13/77
92275CTD or STD cast1978-02-03 03:04:0057.0033 N, 8.9933 WRRS Challenger CH2/78
92576CTD or STD cast1978-02-07 17:20:0057.0116 N, 9.0033 WRRS Challenger CH2/78
94546CTD or STD cast1978-04-17 13:51:0056.985 N, 8.9733 WRRS Challenger CH6/78
94872CTD or STD cast1978-04-20 01:00:0056.9883 N, 8.985 WRRS Challenger CH6/78
95353CTD or STD cast1978-06-06 16:28:0056.9983 N, 8.99 WRRS Challenger CH9/78
95562CTD or STD cast1978-06-08 13:30:0056.9983 N, 9.005 WRRS Challenger CH9/78
186130CTD or STD cast1978-08-10 21:35:0057.0066 N, 9.0 WRRS Challenger CH11B/78
314465CTD or STD cast1978-11-08 14:50:0056.9917 N, 9.0033 WRRS Challenger CH14B/78
98744CTD or STD cast1979-05-21 17:30:0056.995 N, 8.9933 WRRS Challenger CH7/79
99827CTD or STD cast1979-06-27 19:01:0056.995 N, 9.01 WRRS Shackleton S5/79
96080CTD or STD cast1979-10-29 19:52:0057.0033 N, 9.0033 WRRS Challenger CH16/79
187735CTD or STD cast1980-03-04 01:26:0057.0016 N, 9.0033 WRRS Challenger CH4/80
189035CTD or STD cast1980-05-05 07:50:0057.0033 N, 8.9966 WRRS Challenger CH7/80
189717CTD or STD cast1980-06-01 16:55:0056.9833 N, 8.9866 WRRS Challenger CH9B/80
312655CTD or STD cast1981-01-29 21:13:0057.0 N, 9.0 WRRS Challenger CH2/81
187919CTD or STD cast1981-04-13 07:32:0057.0 N, 9.0 WRRS Challenger CH6A/81
188437CTD or STD cast1981-04-21 03:50:0056.9933 N, 9.0 WRRS Challenger CH6B/81
192252CTD or STD cast1981-07-12 22:37:0057.0016 N, 9.0083 WRRS Challenger CH10/81
187250CTD or STD cast1981-10-17 22:13:0057.0066 N, 9.0266 WRRS Challenger CH15/81
189152CTD or STD cast1982-04-27 03:18:0056.985 N, 8.9816 WRRS Challenger CH7A/82
193452CTD or STD cast1983-05-24 16:41:0057.0033 N, 8.9783 WRRS Challenger CH7B/83
96866CTD or STD cast1983-08-16 10:03:0057.0016 N, 9.0 WRRS Challenger CH11/83
97083CTD or STD cast1983-08-19 05:35:0057.0 N, 9.0 WRRS Challenger CH11/83
313216CTD or STD cast1984-06-27 18:15:0056.9983 N, 9.0 WRRS Challenger CH2/84
257913CTD or STD cast1984-12-02 07:36:0057.0 N, 9.0 WRRS Challenger CH10/84
258363CTD or STD cast1985-01-26 18:20:0057.0 N, 9.0 WRRS Challenger CH1/85
253893CTD or STD cast1985-05-08 15:53:0057.0 N, 9.0 WRRS Challenger CH4/85
261198CTD or STD cast1985-08-20 04:22:0056.995 N, 8.995 WRRS Challenger CH8/85
255887CTD or STD cast1985-12-17 02:59:0057.0 N, 9.0 WRRS Frederick Russell FR13/85
264172CTD or STD cast1987-01-10 08:31:0057.0 N, 9.0 WRRS Challenger CH9
250570CTD or STD cast1987-04-30 09:49:0057.0016 N, 8.9983 WRRS Challenger CH14
251616CTD or STD cast1987-11-27 17:48:0056.9983 N, 8.9983 WRRS Challenger CH22
266916CTD or STD cast1988-03-06 11:23:0057.0 N, 9.0016 WRRS Challenger CH25
263967CTD or STD cast1988-06-20 11:59:0057.0 N, 9.0 WRRS Challenger CH30
265360CTD or STD cast1989-01-24 14:25:0057.0 N, 9.0 WRRS Discovery D180
265869CTD or STD cast1989-05-06 04:34:0057.0 N, 9.0 WRV Lough Foyle LF1/89
317647CTD or STD cast1989-08-05 08:20:0057.0 N, 8.9983 WRV Lough Foyle LF2/89
316816CTD or STD cast1989-11-26 00:15:0057.0 N, 9.0067 WRRS Charles Darwin CD44
315087CTD or STD cast1990-06-28 07:54:0057.0 N, 8.9983 WRRS Challenger CH67A
259839CTD or STD cast1990-09-02 15:38:0057.0 N, 9.0 WRRS Challenger CH71A
316005CTD or STD cast1990-12-10 22:20:0057.0 N, 8.9967 WRRS Challenger CH74A_1
382500CTD or STD cast1991-02-26 18:35:0057.0 N, 9.0 WRRS Challenger CH75B
316202CTD or STD cast1991-07-02 14:58:0057.0017 N, 9.0017 WRRS Challenger CH81
386494CTD or STD cast1992-09-26 16:56:0056.9967 N, 8.9983 WRRS Challenger CH97
385350CTD or STD cast1993-03-15 06:26:0056.9967 N, 9.0433 WRRS Challenger CH101B
385743CTD or STD cast1993-05-17 07:02:0057.0 N, 9.0017 WRRS Challenger CH103
385767CTD or STD cast1993-05-17 10:04:0057.0 N, 9.0 WRRS Challenger CH103
385903CTD or STD cast1993-05-19 21:39:0056.9967 N, 9.0017 WRRS Challenger CH103
387910CTD or STD cast1993-09-09 01:53:0057.0 N, 8.9983 WRRS Challenger CH105
388095CTD or STD cast1993-09-11 02:11:0056.9985 N, 9.0008 WRRS Challenger CH105
389074CTD or STD cast1994-03-17 23:18:0057.0 N, 9.0 WRRS Challenger CH110
389351CTD or STD cast1994-05-04 06:29:0057.0 N, 9.0 WRRS Challenger CH112
389492CTD or STD cast1994-05-08 05:54:0057.0 N, 9.0 WRRS Challenger CH112
390801CTD or STD cast1994-08-16 16:34:0056.993 N, 8.9838 WRRS Challenger CH114
391411CTD or STD cast1994-08-23 22:46:0056.9867 N, 9.0333 WRRS Challenger CH114
391423CTD or STD cast1994-08-23 23:18:0057.0 N, 9.0 WRRS Challenger CH114
391970CTD or STD cast1994-11-24 15:48:0057.0 N, 8.9917 WRRS Challenger CH116
434707CTD or STD cast1995-04-15 12:36:0057.0 N, 9.0 WRRS Charles Darwin CD92B
435446CTD or STD cast1995-04-30 14:01:0057.0 N, 9.0 WRRS Charles Darwin CD92B
434025CTD or STD cast1996-01-12 15:52:0057.0 N, 9.0 WRRS Challenger CH124
1289323Water sample data1996-01-12 15:52:0057.0 N, 9.0 WRRS Challenger CH124
1014564CTD or STD cast1996-09-30 18:33:0057.00067 N, 8.9965 WRRS Discovery D223A
1850064Water sample data1996-09-30 18:48:0057.00063 N, 8.9965 WRRS Discovery D223A
1008085CTD or STD cast1997-09-14 11:54:0056.99817 N, 8.98617 WRRS Discovery D230
1305054Water sample data1997-09-14 12:11:0056.99815 N, 8.98619 WRRS Discovery D230
1020686CTD or STD cast1998-05-26 18:36:0056.99717 N, 8.99617 WRRS Discovery D233
1306334Water sample data1998-05-26 18:47:0056.99713 N, 8.99614 WRRS Discovery D233
1849500Water sample data1998-05-26 18:47:0056.99713 N, 8.99614 WRRS Discovery D233
1070622CTD or STD cast1999-09-11 16:40:0056.99917 N, 8.99917 WRRS Discovery D242
1251952Water sample data1999-09-11 16:46:0056.99917 N, 8.99917 WRRS Discovery D242
1075104CTD or STD cast2000-02-03 08:01:0057.00133 N, 9.00067 WRRS Discovery D245
559216CTD or STD cast2000-05-19 04:46:0057.0 N, 8.9967 WFRV Scotia 0700S
676792CTD or STD cast2001-05-20 07:39:0056.99817 N, 8.99217 WRRS Discovery D253
626691CTD or STD cast2003-04-17 21:02:0056.9992 N, 8.9883 WFRV Scotia 0703S
845088CTD or STD cast2003-07-24 17:43:0057.0005 N, 8.99908 WFS Poseidon PO300_2
667069CTD or STD cast2004-07-13 03:15:0056.9995 N, 9.0005 WFS Poseidon PO314
896390CTD or STD cast2005-10-08 03:26:0056.99838 N, 8.99988 WRRS Charles Darwin CD176
896863CTD or STD cast2005-10-25 07:29:0057.00092 N, 8.99782 WRRS Charles Darwin CD176
776664CTD or STD cast2006-10-26 07:35:2056.99867 N, 9.0 WRRS Discovery D312
847519CTD or STD cast2007-08-30 14:39:5257.00044 N, 8.99943 WRRS Discovery D321B
880928CTD or STD cast2008-05-23 09:34:0057.0 N, 9.00483 WFRV Scotia 0508S
1616946Water sample data2008-05-23 09:34:0057.0 N, 9.00483 WFRV Scotia 0508S
954370CTD or STD cast2009-06-20 16:04:2356.99788 N, 8.99698 WRRS Discovery D340A
1052824CTD or STD cast2010-05-20 21:58:1356.99817 N, 8.99617 WRRS Discovery D351
1930039Currents -subsurface Eulerian2010-05-20 21:59:0956.9982 N, 8.998 WRRS Discovery D351
1896873Water sample data2010-05-20 22:10:0056.99828 N, 8.99486 WRRS Discovery D351
1195849CTD or STD cast2011-05-31 16:05:3857.00183 N, 8.99017 WRRS Discovery D365
1203396CTD or STD cast2012-08-03 09:33:0056.99901 N, 9.0017 WRRS Discovery D379
1220572CTD or STD cast2013-05-21 00:36:3857.0 N, 9.0 WRRS James Cook JC086
1371260CTD or STD cast2014-07-16 08:13:1357.0002 N, 8.9975 WRRS James Clark Ross JR20140531 (JR302)
1723434CTD or STD cast2015-06-14 12:01:2356.9998 N, 9.0009 WRRS Discovery DY031
1879359Water sample data2015-06-14 12:11:0056.99979 N, 9.0009 WRRS Discovery DY031
1764697CTD or STD cast2016-06-19 04:01:4757.0016 N, 8.9997 WRRS Discovery DY052
1765824Currents -subsurface Eulerian2016-06-19 04:02:1557.00162 N, 8.9997 WRRS Discovery DY052
1875008Water sample data2016-06-19 04:09:0057.00161 N, 8.9997 WRRS Discovery DY052