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Metadata Report for BODC Series Reference Number 1722443


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_060
BODC Series Reference 1722443
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-13 21:30
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.14946 N ( 57° 9.0' N )
Longitude 9.69946 W ( 9° 42.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 1910.0 m
Minimum Sensor or Sampling Height 11.0 m
Maximum Sensor or Sampling Height 1916.0 m
Sea Floor Depth 1921.0 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 = 1722443

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 O
CategoryOffshore location
Latitude57° 9.00' N
Longitude9° 42.00' W
Water depth below MSL1900.0 m

Ellett Line/Extended Ellett Line: Station O

Station O 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 O 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 O

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
89925CTD or STD cast1975-05-04 03:08:0057.1466 N, 9.7083 WRRS Challenger CH7A/75
89255CTD or STD cast1975-07-05 14:00:0057.1666 N, 9.6833 WRRS Challenger CH10A/75
90139CTD or STD cast1975-11-08 16:52:0057.15 N, 9.695 WRRS Challenger CH14A/75
90569CTD or STD cast1976-04-02 22:55:0057.145 N, 9.7016 WRRS Challenger CH5A/76
91180CTD or STD cast1976-05-21 15:45:0057.1466 N, 9.7033 WRRS Challenger CH8/76
91978CTD or STD cast1977-04-15 15:10:0057.15 N, 9.7016 WRRS Challenger CH6B/77
94245CTD or STD cast1977-07-24 16:01:0057.1566 N, 9.7216 WRRS Challenger CH11/77
88713CTD or STD cast1977-08-21 19:53:0057.145 N, 9.7233 WRRS Challenger CH13/77
92540CTD or STD cast1978-02-07 12:15:0057.1566 N, 9.7183 WRRS Challenger CH2/78
95316CTD or STD cast1978-06-06 11:31:0057.15 N, 9.6916 WRRS Challenger CH9/78
186105CTD or STD cast1978-08-10 10:27:0057.1416 N, 9.6883 WRRS Challenger CH11B/78
190884CTD or STD cast1978-09-13 00:30:0057.15 N, 9.705 WRRS Challenger CH11D/78
98719CTD or STD cast1979-05-21 12:10:0057.1483 N, 9.705 WRRS Challenger CH7/79
95931CTD or STD cast1979-09-14 18:53:0057.1583 N, 9.69 WRRS Challenger CH13/79
96123CTD or STD cast1979-10-30 08:07:0057.15 N, 9.7066 WRRS Challenger CH16/79
187667CTD or STD cast1980-03-03 17:01:0057.1483 N, 9.6983 WRRS Challenger CH4/80
187679CTD or STD cast1980-03-03 17:20:0057.1483 N, 9.6983 WRRS Challenger CH4/80
188960CTD or STD cast1980-05-05 00:57:0057.155 N, 9.705 WRRS Challenger CH7/80
312711CTD or STD cast1981-01-30 21:10:0057.15 N, 9.7 WRRS Challenger CH2/81
187852CTD or STD cast1981-04-13 00:37:0057.1533 N, 9.6983 WRRS Challenger CH6A/81
188401CTD or STD cast1981-04-20 22:05:0057.1516 N, 9.6983 WRRS Challenger CH6B/81
192203CTD or STD cast1981-07-12 12:08:0057.1516 N, 9.7016 WRRS Challenger CH10/81
187194CTD or STD cast1981-10-17 00:41:0057.1483 N, 9.7016 WRRS Challenger CH15/81
189188CTD or STD cast1982-04-27 22:08:0057.1483 N, 9.6983 WRRS Challenger CH7A/82
193488CTD or STD cast1983-05-24 23:21:0057.15 N, 9.7016 WRRS Challenger CH7B/83
193507CTD or STD cast1983-05-24 23:38:0057.1566 N, 9.7 WRRS Challenger CH7B/83
97046CTD or STD cast1983-08-18 23:10:0057.1383 N, 9.7316 WRRS Challenger CH11/83
253924CTD or STD cast1985-05-08 20:47:0057.15 N, 9.6983 WRRS Challenger CH4/85
261229CTD or STD cast1985-08-20 10:11:0057.1516 N, 9.6866 WRRS Challenger CH8/85
264203CTD or STD cast1987-01-10 14:28:0057.15 N, 9.7 WRRS Challenger CH9
250545CTD or STD cast1987-04-30 04:03:0057.1516 N, 9.6883 WRRS Challenger CH14
266885CTD or STD cast1988-03-06 04:47:0057.15 N, 9.6966 WRRS Challenger CH25
263931CTD or STD cast1988-06-20 06:27:0057.15 N, 9.6983 WRRS Challenger CH30
265396CTD or STD cast1989-01-24 20:13:0057.15 N, 9.7 WRRS Discovery D180
265894CTD or STD cast1989-05-06 08:58:0057.15 N, 9.7 WRV Lough Foyle LF1/89
317672CTD or STD cast1989-08-05 12:36:0057.15 N, 9.7 WRV Lough Foyle LF2/89
316853CTD or STD cast1989-11-26 05:38:0057.1517 N, 9.7 WRRS Charles Darwin CD44
315051CTD or STD cast1990-06-28 03:06:0057.15 N, 9.7017 WRRS Challenger CH67A
259803CTD or STD cast1990-09-02 09:57:0057.15 N, 9.7 WRRS Challenger CH71A
382536CTD or STD cast1991-02-27 00:12:0057.15 N, 9.6983 WRRS Challenger CH75B
316238CTD or STD cast1991-07-02 20:11:0057.15 N, 9.7 WRRS Challenger CH81
386525CTD or STD cast1992-09-27 01:35:0057.1517 N, 9.6983 WRRS Challenger CH97
385706CTD or STD cast1993-05-16 20:48:0057.15 N, 9.7017 WRRS Challenger CH103
385835CTD or STD cast1993-05-18 00:01:0057.15 N, 9.6983 WRRS Challenger CH103
387830CTD or STD cast1993-09-07 21:42:0057.1508 N, 9.6878 WRRS Challenger CH105
389105CTD or STD cast1994-03-18 09:17:0057.15 N, 9.7 WRRS Challenger CH110
389314CTD or STD cast1994-05-03 16:38:0057.15 N, 9.7 WRRS Challenger CH112
389431CTD or STD cast1994-05-07 18:40:0057.15 N, 9.7 WRRS Challenger CH112
390862CTD or STD cast1994-08-17 03:10:0057.15 N, 9.7 WRRS Challenger CH114
392008CTD or STD cast1994-11-24 22:37:0057.1507 N, 9.6993 WRRS Challenger CH116
434768CTD or STD cast1995-04-16 06:11:0057.15 N, 9.7 WRRS Charles Darwin CD92B
435378CTD or STD cast1995-04-30 03:27:0057.15 N, 9.7 WRRS Charles Darwin CD92B
390481CTD or STD cast1995-07-30 21:29:0057.15 N, 9.6992 WRRS Challenger CH120
434086CTD or STD cast1996-01-13 03:36:0057.15 N, 9.7 WRRS Challenger CH124
1014607CTD or STD cast1996-10-01 04:24:0057.14117 N, 9.689 WRRS Discovery D223A
1850107Water sample data1996-10-01 05:29:0057.14109 N, 9.68897 WRRS Discovery D223A
1008048CTD or STD cast1997-09-14 04:09:0057.15467 N, 9.7105 WRRS Discovery D230
1305029Water sample data1997-09-14 05:07:0057.15463 N, 9.71044 WRRS Discovery D230
1020650CTD or STD cast1998-05-26 11:21:0057.15183 N, 9.69983 WRRS Discovery D233
1306309Water sample data1998-05-26 12:16:0057.15178 N, 9.6999 WRRS Discovery D233
1849468Water sample data1998-05-26 12:16:0057.15178 N, 9.6999 WRRS Discovery D233
1070566CTD or STD cast1999-09-10 22:47:0057.13983 N, 9.71817 WRRS Discovery D242
1070671CTD or STD cast1999-09-12 01:12:0057.14583 N, 9.60783 WRRS Discovery D242
1252003Water sample data1999-09-12 01:46:0057.14583 N, 9.60783 WRRS Discovery D242
1075177CTD or STD cast2000-02-03 20:40:0057.16083 N, 9.68433 WRRS Discovery D245
559185CTD or STD cast2000-05-18 22:10:0057.15 N, 9.695 WFRV Scotia 0700S
676823CTD or STD cast2001-05-20 13:39:0057.15017 N, 9.69033 WRRS Discovery D253
626722CTD or STD cast2003-04-18 02:37:0057.1497 N, 9.6988 WFRV Scotia 0703S
845027CTD or STD cast2003-07-23 18:20:0057.14935 N, 9.70172 WFS Poseidon PO300_2
667094CTD or STD cast2004-07-13 12:31:0057.1495 N, 9.702 WFS Poseidon PO314
896433CTD or STD cast2005-10-10 12:58:0057.15424 N, 9.7032 WRRS Charles Darwin CD176
776639CTD or STD cast2006-10-25 23:14:3757.14867 N, 9.701 WRRS Discovery D312
847894CTD or STD cast2007-08-30 06:53:5757.14846 N, 9.70677 WRRS Discovery D321B
880897CTD or STD cast2008-05-23 02:25:0057.13533 N, 9.66967 WFRV Scotia 0508S
1616910Water sample data2008-05-23 02:25:0057.13533 N, 9.66967 WFRV Scotia 0508S
954345CTD or STD cast2009-06-20 08:31:5057.15213 N, 9.6969 WRRS Discovery D340A
1052793CTD or STD cast2010-05-20 14:25:4757.14917 N, 9.6995 WRRS Discovery D351
1896836Water sample data2010-05-20 15:20:0057.14967 N, 9.69941 WRRS Discovery D351
1195813CTD or STD cast2011-05-31 08:38:3357.15567 N, 9.70317 WRRS Discovery D365
1203476CTD or STD cast2012-08-03 21:10:0057.1517 N, 9.70046 WRRS Discovery D379
1220467CTD or STD cast2013-05-20 08:53:4657.1525 N, 9.7035 WRRS James Cook JC086
1371223CTD or STD cast2014-07-15 23:29:2357.1492 N, 9.6999 WRRS James Clark Ross JR20140531 (JR302)
1723342CTD or STD cast2015-06-13 21:28:5857.1495 N, 9.6995 WRRS Discovery DY031
1879292Water sample data2015-06-13 22:27:0057.14952 N, 9.69952 WRRS Discovery DY031
1764648CTD or STD cast2016-06-18 02:05:2057.1489 N, 9.6983 WRRS Discovery DY052
1765781Currents -subsurface Eulerian2016-06-18 02:05:3757.14891 N, 9.69824 WRRS Discovery DY052
1874970Water sample data2016-06-18 02:54:0057.14892 N, 9.69826 WRRS Discovery DY052