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Metadata Report for BODC Series Reference Number 1722547


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 Prof 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_069
BODC Series Reference 1722547
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 13:34
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.94956 N ( 56° 57.0' N )
Longitude 8.78226 W ( 8° 46.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 115.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 124.0 m
Sea Floor Depth 129.0 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 = 1722547

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

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."


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 S
CategoryOffshore location
Latitude56° 57.00' N
Longitude8° 46.98' W
Water depth below MSL125.0 m

Ellett Line/Extended Ellett Line: Station S

Station S 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 S 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
B nominal value
Q value below limit of quantification

Appendix 1: Ellett Line/Extended Ellett Line Station S

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
89206CTD or STD cast1975-07-05 00:51:0056.95 N, 8.7833 WRRS Challenger CH10A/75
89673CTD or STD cast1975-08-31 12:10:0056.95 N, 8.7833 WRRS Challenger CH12A/75
90096CTD or STD cast1975-11-08 07:11:0056.9383 N, 8.7916 WRRS Challenger CH14A/75
91143CTD or STD cast1976-05-21 01:42:0056.95 N, 8.7833 WRRS Challenger CH8/76
91954CTD or STD cast1977-04-15 01:40:0056.95 N, 8.7833 WRRS Challenger CH6B/77
94282CTD or STD cast1977-07-24 23:35:0056.9483 N, 8.7833 WRRS Challenger CH11/77
88670CTD or STD cast1977-08-21 12:50:0056.9366 N, 8.7783 WRRS Challenger CH13/77
92263CTD or STD cast1978-02-03 01:27:0056.95 N, 8.7833 WRRS Challenger CH2/78
94558CTD or STD cast1978-04-17 15:38:0056.9333 N, 8.7583 WRRS Challenger CH6/78
95574CTD or STD cast1978-06-08 14:44:0056.9466 N, 8.7716 WRRS Challenger CH9/78
186142CTD or STD cast1978-08-10 22:53:0056.945 N, 8.8033 WRRS Challenger CH11B/78
314385CTD or STD cast1978-11-06 05:45:0056.9433 N, 8.7667 WRRS Challenger CH14B/78
98756CTD or STD cast1979-05-21 18:40:0056.95 N, 8.7833 WRRS Challenger CH7/79
99839CTD or STD cast1979-06-27 20:14:0056.9583 N, 8.755 WRRS Shackleton S5/79
95887CTD or STD cast1979-09-14 01:50:0056.9333 N, 8.775 WRRS Challenger CH13/79
96079CTD or STD cast1979-10-29 18:34:0056.9533 N, 8.795 WRRS Challenger CH16/79
187747CTD or STD cast1980-03-04 10:18:0056.95 N, 8.7833 WRRS Challenger CH4/80
189705CTD or STD cast1980-06-01 15:26:0056.9483 N, 8.7933 WRRS Challenger CH9B/80
187920CTD or STD cast1981-04-13 10:09:0056.9483 N, 8.7783 WRRS Challenger CH6A/81
188449CTD or STD cast1981-04-21 04:55:0056.9533 N, 8.7883 WRRS Challenger CH6B/81
192264CTD or STD cast1981-07-12 23:55:0056.945 N, 8.7816 WRRS Challenger CH10/81
193440CTD or STD cast1983-05-24 15:14:0056.9533 N, 8.81 WRRS Challenger CH7B/83
313204CTD or STD cast1984-06-27 16:43:0056.9517 N, 8.7917 WRRS Challenger CH2/84
257925CTD or STD cast1984-12-02 09:34:0056.9483 N, 8.7833 WRRS Challenger CH10/84
258375CTD or STD cast1985-01-26 20:09:0056.9483 N, 8.7816 WRRS Challenger CH1/85
253881CTD or STD cast1985-05-08 14:36:0056.95 N, 8.7833 WRRS Challenger CH4/85
261186CTD or STD cast1985-08-20 02:58:0056.95 N, 8.7833 WRRS Challenger CH8/85
264160CTD or STD cast1987-01-10 06:45:0056.95 N, 8.7833 WRRS Challenger CH9
250582CTD or STD cast1987-04-30 11:29:0056.95 N, 8.7816 WRRS Challenger CH14
251628CTD or STD cast1987-11-27 19:36:0056.9516 N, 8.7833 WRRS Challenger CH22
266928CTD or STD cast1988-03-06 13:23:0056.9516 N, 8.7833 WRRS Challenger CH25
263979CTD or STD cast1988-06-20 13:37:0056.9466 N, 8.785 WRRS Challenger CH30
265359CTD or STD cast1989-01-24 12:40:0056.95 N, 8.7833 WRRS Discovery D180
265857CTD or STD cast1989-05-06 03:29:0056.95 N, 8.7833 WRV Lough Foyle LF1/89
317635CTD or STD cast1989-08-05 07:17:0056.95 N, 8.7817 WRV Lough Foyle LF2/89
316804CTD or STD cast1989-11-25 23:08:0056.9517 N, 8.785 WRRS Charles Darwin CD44
259840CTD or STD cast1990-09-02 17:10:0056.95 N, 8.7833 WRRS Challenger CH71A
315991CTD or STD cast1990-12-10 21:07:0056.95 N, 8.7817 WRRS Challenger CH74A_1
382493CTD or STD cast1991-02-26 17:16:0056.9483 N, 8.78 WRRS Challenger CH75B
316195CTD or STD cast1991-07-02 13:56:0056.9567 N, 8.7883 WRRS Challenger CH81
386482CTD or STD cast1992-09-26 15:44:0056.95 N, 8.7817 WRRS Challenger CH97
385755CTD or STD cast1993-05-17 08:53:0056.9517 N, 8.7867 WRRS Challenger CH103
385939CTD or STD cast1993-05-20 02:19:0056.95 N, 8.7783 WRRS Challenger CH103
387922CTD or STD cast1993-09-09 03:47:0056.9508 N, 8.7867 WRRS Challenger CH105
388083CTD or STD cast1993-09-11 00:16:0056.9507 N, 8.7848 WRRS Challenger CH105
389062CTD or STD cast1994-03-17 21:49:0056.95 N, 8.7833 WRRS Challenger CH110
389511CTD or STD cast1994-05-08 07:54:0056.95 N, 8.7833 WRRS Challenger CH112
390794CTD or STD cast1994-08-16 15:22:0056.9422 N, 8.7838 WRRS Challenger CH114
391969CTD or STD cast1994-11-24 14:37:0056.9505 N, 8.7745 WRRS Challenger CH116
434688CTD or STD cast1995-04-15 10:28:0056.95 N, 8.7833 WRRS Charles Darwin CD92B
435551CTD or STD cast1995-05-01 05:37:0056.95 N, 8.7833 WRRS Charles Darwin CD92B
390407CTD or STD cast1995-07-30 06:18:0056.95 N, 8.7833 WRRS Challenger CH120
434013CTD or STD cast1996-01-12 14:41:0056.95 N, 8.7833 WRRS Challenger CH124
1289311Water sample data1996-01-12 14:41:0056.95 N, 8.7833 WRRS Challenger CH124
1014552CTD or STD cast1996-09-30 17:14:0056.953 N, 8.78133 WRRS Discovery D223A
1850052Water sample data1996-09-30 17:27:0056.95301 N, 8.7813 WRRS Discovery D223A
1070610CTD or STD cast1999-09-11 14:39:0056.95133 N, 8.78383 WRRS Discovery D242
1251940Water sample data1999-09-11 14:46:0056.95133 N, 8.78383 WRRS Discovery D242
1075097CTD or STD cast2000-02-03 06:12:0056.9475 N, 8.7795 WRRS Discovery D245
559228CTD or STD cast2000-05-19 05:56:0056.9483 N, 8.7833 WFRV Scotia 0700S
1230486Water sample data2000-05-19 05:56:0056.9485 N, 8.78383 WFRV Scotia 0700S
1220848CTD or STD cast2001-05-20 05:40:0056.95167 N, 8.785 WRRS Discovery D253
626678CTD or STD cast2003-04-17 20:04:0056.9495 N, 8.7747 WFRV Scotia 0703S
845107CTD or STD cast2003-07-24 19:35:0056.9494 N, 8.78218 WFS Poseidon PO300_2
667057CTD or STD cast2004-07-13 01:49:0056.94867 N, 8.784 WFS Poseidon PO314
776676CTD or STD cast2006-10-26 09:31:2656.94983 N, 8.78333 WRRS Discovery D312
847520CTD or STD cast2007-08-30 16:19:3156.94837 N, 8.7809 WRRS Discovery D321B
880941CTD or STD cast2008-05-23 10:41:0056.94983 N, 8.78317 WFRV Scotia 0508S
1616958Water sample data2008-05-23 10:41:0056.94983 N, 8.78317 WFRV Scotia 0508S
954382CTD or STD cast2009-06-20 17:52:2656.9456 N, 8.78315 WRRS Discovery D340A
1052836CTD or STD cast2010-05-20 23:24:5156.94917 N, 8.78017 WRRS Discovery D351
1930040Currents -subsurface Eulerian2010-05-20 23:25:2856.9502 N, 8.7814 WRRS Discovery D351
1896885Water sample data2010-05-20 23:36:0056.94844 N, 8.77903 WRRS Discovery D351
1195850CTD or STD cast2011-05-31 17:50:2256.9505 N, 8.78017 WRRS Discovery D365
1203384CTD or STD cast2012-08-03 07:48:0056.94807 N, 8.77737 WRRS Discovery D379
1220756CTD or STD cast2013-05-24 18:17:3756.9496 N, 8.7827 WRRS James Cook JC086
2098475Water sample data2013-05-24 18:29:0057.20306 N, 9.03972 WRRS James Cook JC086
2099546Water sample data2013-05-24 18:29:0057.20306 N, 9.03972 WRRS James Cook JC086
2100137Water sample data2013-05-24 18:29:0057.20306 N, 9.03972 WRRS James Cook JC086
2100696Water sample data2013-05-24 18:29:0057.20306 N, 9.03972 WRRS James Cook JC086
2101675Water sample data2013-05-24 18:29:0057.20306 N, 9.03972 WRRS James Cook JC086
1371272CTD or STD cast2014-07-16 10:10:0856.9499 N, 8.7822 WRRS James Clark Ross JR20140531 (JR302)
1723446CTD or STD cast2015-06-14 13:32:2556.9496 N, 8.7822 WRRS Discovery DY031
2150472Water sample data2015-06-14 13:42:3056.94957 N, 8.78225 WRRS Discovery DY031
1879360Water sample data2015-06-14 13:43:0056.94957 N, 8.78225 WRRS Discovery DY031
1764704CTD or STD cast2016-06-19 05:27:0656.9516 N, 8.7831 WRRS Discovery DY052
1765836Currents -subsurface Eulerian2016-06-19 05:27:2256.95156 N, 8.78314 WRRS Discovery DY052
2149538Water sample data2016-06-19 05:34:3356.95155 N, 8.78314 WRRS Discovery DY052
1875021Water sample data2016-06-19 05:35:0056.95155 N, 8.78314 WRRS Discovery DY052
1975937CTD or STD cast2017-05-15 17:37:2456.9504 N, 8.7824 WRRS Discovery DY078 (DY079)