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Metadata Report for BODC Series Reference Number 1722640


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_079
BODC Series Reference 1722640
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 09:20
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.73322 N ( 56° 44.0' N )
Longitude 7.00094 W ( 7° 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 125.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 134.0 m
Sea Floor Depth 139.0 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 = 1722640

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 7G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 0.00' W
Water depth below MSL145.0 m

Ellett Line/Extended Ellett Line: Station 7G

Station 7G 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 7G 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 7G was also referred to as Station C5.

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 7G

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
90594CTD or STD cast1976-04-04 15:05:0056.7333 N, 7.0083 WRRS Challenger CH5A/76
91087CTD or STD cast1977-03-08 05:10:0056.7466 N, 6.9833 WRRS Challenger CH4/77
91898CTD or STD cast1977-04-14 16:02:0056.7333 N, 7.0016 WRRS Challenger CH6B/77
94349CTD or STD cast1977-07-25 13:03:0056.7316 N, 6.995 WRRS Challenger CH11/77
92195CTD or STD cast1978-02-02 15:47:0056.7316 N, 7.0 WRRS Challenger CH2/78
94964CTD or STD cast1978-04-20 18:05:0056.745 N, 7.0 WRRS Challenger CH6/78
95734CTD or STD cast1978-06-09 17:11:0056.7383 N, 7.0066 WRRS Challenger CH9/78
186209CTD or STD cast1978-08-11 08:16:0056.7316 N, 7.005 WRRS Challenger CH11B/78
314312CTD or STD cast1978-11-04 21:12:0056.7367 N, 6.9967 WRRS Challenger CH14B/78
98824CTD or STD cast1979-05-22 04:25:0056.7316 N, 7.0 WRRS Challenger CH7/79
95814CTD or STD cast1979-09-13 12:45:0056.735 N, 7.005 WRRS Challenger CH13/79
96006CTD or STD cast1979-10-29 07:38:0056.7333 N, 6.9983 WRRS Challenger CH16/79
187803CTD or STD cast1980-03-04 20:18:0056.735 N, 7.0 WRRS Challenger CH4/80
189649CTD or STD cast1980-06-01 03:59:0056.7216 N, 7.03 WRRS Challenger CH9B/80
186885CTD or STD cast1980-10-02 13:24:0056.73 N, 7.0 WRRS Challenger CH15/80
312538CTD or STD cast1981-01-27 20:22:0056.7333 N, 7.0 WRRS Challenger CH2/81
187993CTD or STD cast1981-04-14 02:19:0056.7333 N, 7.0 WRRS Challenger CH6A/81
191457CTD or STD cast1981-07-07 10:46:0056.74 N, 7.015 WRRS Challenger CH10/81
187298CTD or STD cast1981-10-19 17:50:0056.7316 N, 7.0116 WRRS Challenger CH15/81
312772CTD or STD cast1982-01-27 20:24:0056.733 N, 7.0 WRRS Challenger CH2/82
189084CTD or STD cast1982-04-26 14:40:0056.7316 N, 6.9833 WRRS Challenger CH7A/82
193347CTD or STD cast1983-05-24 02:32:0056.7333 N, 7.0 WRRS Challenger CH7B/83
96786CTD or STD cast1983-08-15 17:04:0056.7316 N, 7.0083 WRRS Challenger CH11/83
313124CTD or STD cast1984-06-26 23:42:0056.7333 N, 6.9883 WRRS Challenger CH2/84
257986CTD or STD cast1984-12-02 23:06:0056.7366 N, 6.985 WRRS Challenger CH10/84
258584CTD or STD cast1985-01-28 21:19:0056.7333 N, 7.0 WRRS Challenger CH1/85
253807CTD or STD cast1985-05-08 02:54:0056.7333 N, 7.0 WRRS Challenger CH4/85
261101CTD or STD cast1985-08-19 13:17:0056.7333 N, 6.9983 WRRS Challenger CH8/85
255826CTD or STD cast1985-12-16 02:43:0056.7333 N, 7.0 WRRS Frederick Russell FR13/85
346117CTD or STD cast1986-06-14 07:44:0056.7333 N, 7.0 WMV Dawn Sky DSK1/86
346707CTD or STD cast1986-08-28 04:07:0056.7283 N, 7.0133 WRRS Frederick Russell FR7B/86
347981CTD or STD cast1986-09-26 10:52:0056.7333 N, 7.0 WRRS Frederick Russell FR8/86
264080CTD or STD cast1987-01-09 02:26:0056.7333 N, 7.0 WRRS Challenger CH9
250650CTD or STD cast1987-04-30 22:58:0056.7366 N, 7.0 WRRS Challenger CH14
255980CTD or STD cast1987-08-31 20:46:0056.7333 N, 7.0 WRRS Frederick Russell FR18/87
251340CTD or STD cast1987-11-24 21:41:0056.735 N, 7.0 WRRS Challenger CH22
267004CTD or STD cast1988-03-07 01:26:0056.7366 N, 7.005 WRRS Challenger CH25
262699CTD or STD cast1988-06-08 18:46:0056.735 N, 7.0 WRRS Challenger CH30
265267CTD or STD cast1989-01-23 22:47:0056.7333 N, 7.0 WRRS Discovery D180
265777CTD or STD cast1989-05-05 17:45:0056.7333 N, 7.0 WRV Lough Foyle LF1/89
317555CTD or STD cast1989-08-04 21:24:0056.735 N, 7.0017 WRV Lough Foyle LF2/89
316693CTD or STD cast1989-11-25 10:35:0056.7333 N, 7.005 WRRS Charles Darwin CD44
314754CTD or STD cast1990-03-13 02:02:0056.7367 N, 6.9933 WRRS Challenger CH63_2
315143CTD or STD cast1990-06-28 18:09:0056.7333 N, 7.0033 WRRS Challenger CH67A
259920CTD or STD cast1990-09-03 04:05:0056.7333 N, 7.0 WRRS Challenger CH71A
315905CTD or STD cast1990-12-10 01:54:0056.7333 N, 6.995 WRRS Challenger CH74A_1
382419CTD or STD cast1991-02-24 19:20:0056.7333 N, 7.0 WRRS Challenger CH75B
316110CTD or STD cast1991-07-02 01:42:0056.7333 N, 7.0017 WRRS Challenger CH81
384266CTD or STD cast1991-11-26 20:13:0056.74 N, 7.0033 WRRS Challenger CH86B
385024CTD or STD cast1992-03-08 02:30:0056.7333 N, 7.0 WRRS Challenger CH89B
386408CTD or STD cast1992-09-26 03:53:0056.73 N, 6.9967 WRRS Challenger CH97
385301CTD or STD cast1993-03-14 12:55:0056.7333 N, 6.9983 WRRS Challenger CH101B
386027CTD or STD cast1993-05-20 16:06:0056.735 N, 6.995 WRRS Challenger CH103
387971CTD or STD cast1993-09-10 01:47:0056.7347 N, 6.9967 WRRS Challenger CH105
388998CTD or STD cast1994-03-14 23:52:0056.7333 N, 7.0 WRRS Challenger CH110
389584CTD or STD cast1994-05-08 19:11:0056.7333 N, 7.0 WRRS Challenger CH112
391889CTD or STD cast1994-11-21 23:30:0056.7333 N, 7.0 WRRS Challenger CH116
434615CTD or STD cast1995-04-14 19:43:0056.7333 N, 7.0 WRRS Charles Darwin CD92B
435631CTD or STD cast1995-05-01 15:37:0056.7333 N, 7.0 WRRS Charles Darwin CD92B
390327CTD or STD cast1995-07-29 19:32:0056.7417 N, 6.9988 WRRS Challenger CH120
433937CTD or STD cast1996-01-11 20:58:0056.7333 N, 7.0 WRRS Challenger CH124
1289231Water sample data1996-01-11 20:58:0056.7333 N, 7.0 WRRS Challenger CH124
1075012CTD or STD cast2000-02-01 17:21:0056.73483 N, 7.0035 WRRS Discovery D245
845193CTD or STD cast2003-07-25 10:11:0056.73467 N, 6.99867 WFS Poseidon PO300_2
666982CTD or STD cast2004-07-12 15:59:0056.734 N, 6.998 WFS Poseidon PO314
896992CTD or STD cast2005-10-26 02:05:0056.73306 N, 6.99934 WRRS Charles Darwin CD176
776897CTD or STD cast2006-10-29 22:32:4756.7355 N, 6.99667 WRRS Discovery D312
847612CTD or STD cast2007-08-31 08:19:0556.73546 N, 7.00042 WRRS Discovery D321B
881053CTD or STD cast2008-05-23 20:51:0056.73317 N, 6.99933 WFRV Scotia 0508S
1617071Water sample data2008-05-23 20:51:0056.73317 N, 6.99933 WFRV Scotia 0508S
954763CTD or STD cast2009-06-24 22:47:1856.73261 N, 7.00235 WRRS Discovery D340A
1052941CTD or STD cast2010-05-21 12:53:0056.73033 N, 7.0005 WRRS Discovery D351
1896989Water sample data2010-05-21 13:04:0056.72999 N, 7.00057 WRRS Discovery D351
1195327CTD or STD cast2011-05-20 08:48:5256.7345 N, 6.99583 WRRS Discovery D365
1203279CTD or STD cast2012-08-02 16:16:0056.73294 N, 6.99988 WRRS Discovery D379
1220640CTD or STD cast2013-05-23 23:12:0156.7333 N, 7.0 WRRS James Cook JC086
1371376CTD or STD cast2014-07-17 05:17:0256.7328 N, 7.0006 WRRS James Clark Ross JR20140531 (JR302)
1723563CTD or STD cast2015-06-15 09:19:2856.7332 N, 7.001 WRRS Discovery DY031
1879464Water sample data2015-06-15 09:30:0056.73321 N, 7.00093 WRRS Discovery DY031
1764821CTD or STD cast2016-06-19 23:16:4356.733 N, 6.9986 WRRS Discovery DY052
1765953Currents -subsurface Eulerian2016-06-19 23:17:1556.73301 N, 6.99862 WRRS Discovery DY052
1875125Water sample data2016-06-19 23:26:0056.73301 N, 6.99861 WRRS Discovery DY052