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Metadata Report for BODC Series Reference Number 1722584


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_073
BODC Series Reference 1722584
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 20:16
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.78324 N ( 56° 47.0' N )
Longitude 8.00084 W ( 8° 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 110.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 119.0 m
Sea Floor Depth 124.0 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 = 1722584

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 13G
CategoryOffshore location
Latitude56° 46.98' N
Longitude8° 0.00' W
Water depth below MSL110.0 m

Ellett Line/Extended Ellett Line: Station 13G

Station 13G 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 13G 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. During this period Station 13G was also referred to as Station C8.

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 13G

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
91733CTD or STD cast1976-05-28 15:33:0056.7933 N, 8.0 WRRS Challenger CH8/76
91051CTD or STD cast1977-03-08 00:05:0056.7833 N, 7.99 WRRS Challenger CH4/77
91929CTD or STD cast1977-04-14 20:47:0056.7833 N, 7.9966 WRRS Challenger CH6B/77
94313CTD or STD cast1977-07-25 08:18:0056.78 N, 8.0 WRRS Challenger CH11/77
89187CTD or STD cast1977-08-31 23:55:0056.7816 N, 7.9916 WRRS Challenger CH13/77
94595CTD or STD cast1978-04-17 20:18:0056.7883 N, 7.995 WRRS Challenger CH6/78
314348CTD or STD cast1978-11-06 00:25:0056.775 N, 8.01 WRRS Challenger CH14B/78
98793CTD or STD cast1979-05-21 23:22:0056.7833 N, 8.0033 WRRS Challenger CH7/79
99864CTD or STD cast1979-06-28 00:23:0056.775 N, 8.0 WRRS Shackleton S5/79
95851CTD or STD cast1979-09-13 18:41:0056.7833 N, 8.0 WRRS Challenger CH13/79
96043CTD or STD cast1979-10-29 13:20:0056.7783 N, 8.005 WRRS Challenger CH16/79
187772CTD or STD cast1980-03-04 15:18:0056.7833 N, 8.0016 WRRS Challenger CH4/80
189674CTD or STD cast1980-06-01 10:20:0056.7833 N, 8.0166 WRRS Challenger CH9B/80
186916CTD or STD cast1980-10-02 19:06:0056.7816 N, 7.9983 WRRS Challenger CH15/80
312563CTD or STD cast1981-01-28 03:38:0056.7833 N, 8.0 WRRS Challenger CH2/81
187956CTD or STD cast1981-04-13 21:30:0056.785 N, 7.9966 WRRS Challenger CH6A/81
192319CTD or STD cast1981-07-13 04:48:0056.7833 N, 7.9983 WRRS Challenger CH10/81
189115CTD or STD cast1982-04-26 21:20:0056.8033 N, 8.0 WRRS Challenger CH7A/82
193403CTD or STD cast1983-05-24 09:36:0056.775 N, 7.9966 WRRS Challenger CH7B/83
96830CTD or STD cast1983-08-16 02:46:0056.7833 N, 8.0 WRRS Challenger CH11/83
313173CTD or STD cast1984-06-27 08:52:0056.7667 N, 8.0 WRRS Challenger CH2/84
257950CTD or STD cast1984-12-02 15:52:0056.7816 N, 8.0016 WRRS Challenger CH10/84
258406CTD or STD cast1985-01-27 01:29:0056.7833 N, 7.9983 WRRS Challenger CH1/85
253844CTD or STD cast1985-05-08 09:57:0056.7833 N, 8.0 WRRS Challenger CH4/85
261149CTD or STD cast1985-08-19 21:17:0056.7983 N, 8.0 WRRS Challenger CH8/85
255851CTD or STD cast1985-12-16 20:02:0056.7833 N, 8.0 WRRS Frederick Russell FR13/85
264135CTD or STD cast1987-01-10 01:35:0056.7833 N, 8.0 WRRS Challenger CH9
250613CTD or STD cast1987-04-30 16:14:0056.785 N, 7.9933 WRRS Challenger CH14
255943CTD or STD cast1987-08-31 15:02:0056.7833 N, 8.0 WRRS Frederick Russell FR18/87
251665CTD or STD cast1987-11-28 00:12:0056.785 N, 8.0 WRRS Challenger CH22
266965CTD or STD cast1988-03-06 18:35:0056.7866 N, 7.9966 WRRS Challenger CH25
264006CTD or STD cast1988-06-20 18:02:0056.78 N, 8.0016 WRRS Challenger CH30
265311CTD or STD cast1989-01-24 06:48:0056.7833 N, 8.0166 WRRS Discovery D180
265821CTD or STD cast1989-05-05 22:55:0056.7833 N, 8.0 WRV Lough Foyle LF1/89
317592CTD or STD cast1989-08-05 03:15:0056.785 N, 8.0017 WRV Lough Foyle LF2/89
316761CTD or STD cast1989-11-25 18:09:0056.7833 N, 8.0 WRRS Charles Darwin CD44
315106CTD or STD cast1990-06-28 12:33:0056.7817 N, 8.0 WRRS Challenger CH67A
259876CTD or STD cast1990-09-02 21:47:0056.7833 N, 8.0 WRRS Challenger CH71A
315862CTD or STD cast1990-12-09 18:48:0056.79 N, 8.0033 WRRS Challenger CH74A_1
382456CTD or STD cast1991-02-25 02:28:0056.78 N, 7.995 WRRS Challenger CH75B
316158CTD or STD cast1991-07-02 08:31:0056.79 N, 7.9983 WRRS Challenger CH81
386457CTD or STD cast1992-09-26 11:14:0056.78 N, 8.01 WRRS Challenger CH97
385337CTD or STD cast1993-03-14 22:55:0056.775 N, 8.0233 WRRS Challenger CH101B
385976CTD or STD cast1993-05-20 10:15:0056.7833 N, 7.9983 WRRS Challenger CH103
388034CTD or STD cast1993-09-10 18:19:0056.785 N, 7.9983 WRRS Challenger CH105
389037CTD or STD cast1994-03-15 08:04:0056.7833 N, 8.0 WRRS Challenger CH110
389547CTD or STD cast1994-05-08 12:39:0056.776 N, 7.9882 WRRS Challenger CH112
390769CTD or STD cast1994-08-16 09:36:0056.7833 N, 8.0 WRRS Challenger CH114
391933CTD or STD cast1994-11-24 09:47:0056.7833 N, 8.0 WRRS Challenger CH116
434652CTD or STD cast1995-04-15 04:03:0056.7833 N, 8.0 WRRS Charles Darwin CD92B
435587CTD or STD cast1995-05-01 09:51:0056.7833 N, 8.0 WRRS Charles Darwin CD92B
390364CTD or STD cast1995-07-30 01:37:0056.7853 N, 8.0013 WRRS Challenger CH120
433986CTD or STD cast1996-01-12 07:25:0056.7833 N, 8.0 WRRS Challenger CH124
1289279Water sample data1996-01-12 07:25:0056.7833 N, 8.0 WRRS Challenger CH124
1014527CTD or STD cast1996-09-30 12:26:0056.7845 N, 8.00733 WRRS Discovery D223A
1850027Water sample data1996-09-30 12:38:0056.78455 N, 8.00737 WRRS Discovery D223A
1077135CTD or STD cast1999-06-04 21:46:0056.78317 N, 8.00067 WNot applicable
1070578CTD or STD cast1999-09-11 08:43:0056.77883 N, 8.027 WRRS Discovery D242
1251915Water sample data1999-09-11 08:49:0056.77883 N, 8.027 WRRS Discovery D242
1075061CTD or STD cast2000-02-02 21:42:0056.77817 N, 8.01867 WRRS Discovery D245
845132CTD or STD cast2003-07-25 01:55:0056.78395 N, 8.00187 WFS Poseidon PO300_2
667033CTD or STD cast2004-07-12 21:40:0056.78383 N, 8.00083 WFS Poseidon PO314
896899CTD or STD cast2005-10-25 13:46:0056.78199 N, 8.00053 WRRS Charles Darwin CD176
776781CTD or STD cast2006-10-27 05:08:4956.78583 N, 7.99683 WRRS Discovery D312
847568CTD or STD cast2007-08-30 22:11:4956.78298 N, 8.00016 WRRS Discovery D321B
880989CTD or STD cast2008-05-23 15:20:0056.78317 N, 8.00083 WFRV Scotia 0508S
1617009Water sample data2008-05-23 15:20:0056.78317 N, 8.00083 WFRV Scotia 0508S
954695CTD or STD cast2009-06-24 15:49:5556.78408 N, 7.99968 WRRS Discovery D340A
1052873CTD or STD cast2010-05-21 04:24:2456.78383 N, 8.00267 WRRS Discovery D351
1930076Currents -subsurface Eulerian2010-05-21 04:25:3256.7838 N, 8.0027 WRRS Discovery D351
1896916Water sample data2010-05-21 04:35:0056.78364 N, 8.0029 WRRS Discovery D351
1203347CTD or STD cast2012-08-03 01:31:0056.78308 N, 8.00008 WRRS Discovery D379
1220719CTD or STD cast2013-05-24 12:10:1156.7839 N, 8.0003 WRRS James Cook JC086
1371315CTD or STD cast2014-07-16 18:01:4756.7829 N, 8.0 WRRS James Clark Ross JR20140531 (JR302)
1723495CTD or STD cast2015-06-14 20:15:4156.7832 N, 8.0008 WRRS Discovery DY031
1879403Water sample data2015-06-14 20:28:0056.78324 N, 8.00084 WRRS Discovery DY031
1764753CTD or STD cast2016-06-19 11:09:2156.7834 N, 8.0 WRRS Discovery DY052
1765885Currents -subsurface Eulerian2016-06-19 11:10:2456.78341 N, 7.99998 WRRS Discovery DY052
1875069Water sample data2016-06-19 11:18:0056.78341 N, 7.99999 WRRS Discovery DY052