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Metadata Report for BODC Series Reference Number 1722627


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_077
BODC Series Reference 1722627
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 05:01
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.73380 N ( 56° 44.0' N )
Longitude 7.33424 W ( 7° 20.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 145.0 m
Minimum Sensor or Sampling Height 16.0 m
Maximum Sensor or Sampling Height 156.0 m
Sea Floor Depth 161.0 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 = 1722627

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 9G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 19.98' W
Water depth below MSL160.0 m

Ellett Line/Extended Ellett Line: Station 9G

Station 9G 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 9G 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 9G was also referred to as Station C6.

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 9G

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
91757CTD or STD cast1976-05-28 18:30:0056.735 N, 7.2833 WRRS Challenger CH8/76
91075CTD or STD cast1977-03-08 03:20:0056.7333 N, 7.3333 WRRS Challenger CH4/77
91905CTD or STD cast1977-04-14 17:41:0056.73 N, 7.3366 WRRS Challenger CH6B/77
94337CTD or STD cast1977-07-25 11:27:0056.7333 N, 7.3266 WRRS Challenger CH11/77
92202CTD or STD cast1978-02-02 17:22:0056.7583 N, 7.33 WRRS Challenger CH2/78
94952CTD or STD cast1978-04-20 16:38:0056.7416 N, 7.3333 WRRS Challenger CH6/78
186191CTD or STD cast1978-08-11 06:35:0056.7333 N, 7.3333 WRRS Challenger CH11B/78
190896CTD or STD cast1978-09-14 08:40:0056.7166 N, 7.3416 WRRS Challenger CH11D/78
314324CTD or STD cast1978-11-04 23:28:0056.7333 N, 7.3233 WRRS Challenger CH14B/78
98812CTD or STD cast1979-05-22 02:48:0056.7316 N, 7.33 WRRS Challenger CH7/79
99888CTD or STD cast1979-06-28 03:39:0056.7316 N, 7.33 WRRS Shackleton S5/79
95826CTD or STD cast1979-09-13 14:40:0056.7283 N, 7.3283 WRRS Challenger CH13/79
187796CTD or STD cast1980-03-04 18:38:0056.7316 N, 7.3316 WRRS Challenger CH4/80
189650CTD or STD cast1980-06-01 06:00:0056.7316 N, 7.3216 WRRS Challenger CH9B/80
186897CTD or STD cast1980-10-02 15:14:0056.7333 N, 7.335 WRRS Challenger CH15/80
312551CTD or STD cast1981-01-27 22:50:0056.7333 N, 7.3333 WRRS Challenger CH2/81
187981CTD or STD cast1981-04-14 00:43:0056.7316 N, 7.3233 WRRS Challenger CH6A/81
191470CTD or STD cast1981-07-07 14:20:0056.7366 N, 7.3233 WRRS Challenger CH10/81
189096CTD or STD cast1982-04-26 16:46:0056.7333 N, 7.3333 WRRS Challenger CH7A/82
193360CTD or STD cast1983-05-24 04:47:0056.7366 N, 7.3266 WRRS Challenger CH7B/83
193870CTD or STD cast1983-08-15 20:58:0056.735 N, 7.3333 WRRS Challenger CH11/83
313136CTD or STD cast1984-06-27 03:20:0056.7333 N, 7.3333 WRRS Challenger CH2/84
257974CTD or STD cast1984-12-02 20:56:0056.7333 N, 7.3333 WRRS Challenger CH10/84
258596CTD or STD cast1985-01-29 00:18:0056.7316 N, 7.335 WRRS Challenger CH1/85
253819CTD or STD cast1985-05-08 05:00:0056.7333 N, 7.3333 WRRS Challenger CH4/85
261113CTD or STD cast1985-08-19 16:11:0056.7333 N, 7.3366 WRRS Challenger CH8/85
255906CTD or STD cast1985-12-17 08:58:0056.7366 N, 7.3333 WRRS Frederick Russell FR13/85
346105CTD or STD cast1986-06-14 05:19:0056.7333 N, 7.3333 WMV Dawn Sky DSK1/86
346719CTD or STD cast1986-08-28 05:28:0056.735 N, 7.335 WRRS Frederick Russell FR7B/86
347956CTD or STD cast1986-09-26 08:19:0056.7333 N, 7.3333 WRRS Frederick Russell FR8/86
264092CTD or STD cast1987-01-09 21:21:0056.7333 N, 7.3333 WRRS Challenger CH9
250649CTD or STD cast1987-04-30 20:31:0056.735 N, 7.335 WRRS Challenger CH14
255979CTD or STD cast1987-08-31 18:50:0056.7333 N, 7.3333 WRRS Frederick Russell FR18/87
251352CTD or STD cast1987-11-25 00:24:0056.73 N, 7.3483 WRRS Challenger CH22
266990CTD or STD cast1988-03-06 23:05:0056.735 N, 7.3333 WRRS Challenger CH25
262706CTD or STD cast1988-06-08 21:18:0056.7416 N, 7.3333 WRRS Challenger CH30
265279CTD or STD cast1989-01-24 01:26:0056.7333 N, 7.3333 WRRS Discovery D180
265789CTD or STD cast1989-05-05 19:36:0056.7333 N, 7.3333 WRV Lough Foyle LF1/89
317567CTD or STD cast1989-08-04 23:45:0056.7283 N, 7.3383 WRV Lough Foyle LF2/89
316712CTD or STD cast1989-11-25 13:08:0056.7333 N, 7.3333 WRRS Charles Darwin CD44
315131CTD or STD cast1990-06-28 16:07:0056.7317 N, 7.335 WRRS Challenger CH67A
259919CTD or STD cast1990-09-03 01:54:0056.7333 N, 7.3333 WRRS Challenger CH71A
315898CTD or STD cast1990-12-09 23:37:0056.7333 N, 7.3333 WRRS Challenger CH74A_1
382420CTD or STD cast1991-02-24 21:48:0056.7333 N, 7.3383 WRRS Challenger CH75B
316122CTD or STD cast1991-07-02 04:17:0056.7367 N, 7.335 WRRS Challenger CH81
384278CTD or STD cast1991-11-26 21:52:0056.7333 N, 7.335 WRRS Challenger CH86B
385036CTD or STD cast1992-03-08 05:08:0056.7367 N, 7.345 WRRS Challenger CH89B
386421CTD or STD cast1992-09-26 06:50:0056.7417 N, 7.3333 WRRS Challenger CH97
385313CTD or STD cast1993-03-14 16:56:0056.7117 N, 7.345 WRRS Challenger CH101B
386015CTD or STD cast1993-05-20 14:49:0056.735 N, 7.3167 WRRS Challenger CH103
387958CTD or STD cast1993-09-09 23:30:0056.7332 N, 7.3303 WRRS Challenger CH105
389001CTD or STD cast1994-03-15 01:30:0056.7335 N, 7.3242 WRRS Challenger CH110
389572CTD or STD cast1994-05-08 17:38:0056.7333 N, 7.3333 WRRS Challenger CH112
390733CTD or STD cast1994-08-16 04:22:0056.7335 N, 7.3257 WRRS Challenger CH114
391890CTD or STD cast1994-11-22 15:16:0056.7337 N, 7.3337 WRRS Challenger CH116
434627CTD or STD cast1995-04-14 22:26:0056.7333 N, 7.3333 WRRS Charles Darwin CD92B
435618CTD or STD cast1995-05-01 13:53:0056.7333 N, 7.3333 WRRS Charles Darwin CD92B
390339CTD or STD cast1995-07-29 21:11:0056.7328 N, 7.3328 WRRS Challenger CH120
433949CTD or STD cast1996-01-12 00:30:0056.7333 N, 7.3333 WRRS Challenger CH124
1289243Water sample data1996-01-12 00:30:0056.7333 N, 7.3333 WRRS Challenger CH124
1075024CTD or STD cast2000-02-01 19:31:0056.732 N, 7.33017 WRRS Discovery D245
845181CTD or STD cast2003-07-25 07:33:0056.73333 N, 7.33318 WFS Poseidon PO300_2
666994CTD or STD cast2004-07-12 17:39:0056.73367 N, 7.3345 WFS Poseidon PO314
896979CTD or STD cast2005-10-25 22:53:0056.7341 N, 7.33144 WRRS Charles Darwin CD176
776732CTD or STD cast2006-10-26 23:08:5256.73517 N, 7.33133 WRRS Discovery D312
881028CTD or STD cast2008-05-23 19:00:0056.73367 N, 7.333 WFRV Scotia 0508S
1617046Water sample data2008-05-23 19:00:0056.73367 N, 7.333 WFRV Scotia 0508S
954738CTD or STD cast2009-06-24 20:29:4356.73255 N, 7.32864 WRRS Discovery D340A
1052916CTD or STD cast2010-05-21 10:17:5056.7355 N, 7.3355 WRRS Discovery D351
1930107Currents -subsurface Eulerian2010-05-21 10:18:3356.7355 N, 7.3353 WRRS Discovery D351
1896965Water sample data2010-05-21 10:29:0056.73545 N, 7.33525 WRRS Discovery D351
1195340CTD or STD cast2011-05-20 12:25:2556.73517 N, 7.33333 WRRS Discovery D365
1203292CTD or STD cast2012-08-02 19:46:0056.7324 N, 7.33209 WRRS Discovery D379
1220664CTD or STD cast2013-05-24 02:22:4256.7335 N, 7.3336 WRRS James Cook JC086
1371352CTD or STD cast2014-07-17 01:25:0656.7327 N, 7.3332 WRRS James Clark Ross JR20140531 (JR302)
1723538CTD or STD cast2015-06-15 05:01:1456.7338 N, 7.3342 WRRS Discovery DY031
1879440Water sample data2015-06-15 05:11:0056.7338 N, 7.33423 WRRS Discovery DY031
1764790CTD or STD cast2016-06-19 20:28:3156.7333 N, 7.3327 WRRS Discovery DY052
1765928Currents -subsurface Eulerian2016-06-19 20:28:5756.73326 N, 7.33272 WRRS Discovery DY052
1875101Water sample data2016-06-19 20:37:0056.73325 N, 7.33271 WRRS Discovery DY052