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Metadata Report for BODC Series Reference Number 1722431


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_059
BODC Series Reference 1722431
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-13 09:21
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.23326 N ( 57° 14.0' N )
Longitude 10.05020 W ( 10° 3.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 2085.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 2094.0 m
Sea Floor Depth 2099.0 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 = 1722431

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 N
CategoryOffshore location
Latitude57° 13.98' N
Longitude10° 3.00' W
Water depth below MSL2100.0 m

Ellett Line/Extended Ellett Line: Station N

Station N 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 N 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 N

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
89937CTD or STD cast1975-05-04 06:35:0057.2333 N, 10.0166 WRRS Challenger CH7A/75
89267CTD or STD cast1975-07-05 16:40:0057.225 N, 9.9833 WRRS Challenger CH10A/75
90140CTD or STD cast1975-11-08 19:43:0057.2266 N, 10.0533 WRRS Challenger CH14A/75
90557CTD or STD cast1976-04-02 20:02:0057.2266 N, 10.1116 WRRS Challenger CH5A/76
91192CTD or STD cast1976-05-21 19:00:0057.2283 N, 10.0316 WRRS Challenger CH8/76
90999CTD or STD cast1977-03-07 12:57:0057.2333 N, 10.0 WRRS Challenger CH4/77
91991CTD or STD cast1977-04-15 17:33:0057.2383 N, 10.0716 WRRS Challenger CH6B/77
94233CTD or STD cast1977-07-24 13:27:0057.2333 N, 10.05 WRRS Challenger CH11/77
92539CTD or STD cast1978-02-07 09:39:0057.2416 N, 10.055 WRRS Challenger CH2/78
95304CTD or STD cast1978-06-06 09:05:0057.245 N, 10.005 WRRS Challenger CH9/78
186098CTD or STD cast1978-08-10 07:52:0057.2316 N, 10.0433 WRRS Challenger CH11B/78
190872CTD or STD cast1978-09-12 22:00:0057.2333 N, 10.05 WRRS Challenger CH11D/78
314441CTD or STD cast1978-11-08 08:02:0057.2283 N, 10.0467 WRRS Challenger CH14B/78
98707CTD or STD cast1979-05-21 09:30:0057.2233 N, 10.0466 WRRS Challenger CH7/79
95943CTD or STD cast1979-09-14 21:45:0057.2316 N, 10.0566 WRRS Challenger CH13/79
187655CTD or STD cast1980-03-03 14:17:0057.245 N, 10.035 WRRS Challenger CH4/80
188959CTD or STD cast1980-05-04 21:52:0057.235 N, 10.0483 WRRS Challenger CH7/80
312723CTD or STD cast1981-01-30 23:31:0057.2333 N, 10.05 WRRS Challenger CH2/81
188394CTD or STD cast1981-04-20 19:40:0057.235 N, 10.05 WRRS Challenger CH6B/81
192196CTD or STD cast1981-07-12 09:35:0057.235 N, 10.0583 WRRS Challenger CH10/81
187182CTD or STD cast1981-10-16 18:34:0057.23 N, 10.0516 WRRS Challenger CH15/81
189207CTD or STD cast1982-04-28 05:56:0057.23 N, 10.0516 WRRS Challenger CH7A/82
189219CTD or STD cast1982-04-28 06:23:0057.23 N, 10.0516 WRRS Challenger CH7A/82
193519CTD or STD cast1983-05-25 02:34:0057.2316 N, 10.0516 WRRS Challenger CH7B/83
97034CTD or STD cast1983-08-18 12:17:0057.23 N, 10.0466 WRRS Challenger CH11/83
313265CTD or STD cast1984-06-28 03:32:0057.2317 N, 10.0483 WRRS Challenger CH2/84
258338CTD or STD cast1985-01-26 11:54:0057.2333 N, 10.0483 WRRS Challenger CH1/85
253936CTD or STD cast1985-05-08 23:03:0057.235 N, 10.05 WRRS Challenger CH4/85
261230CTD or STD cast1985-08-20 13:04:0057.2333 N, 10.05 WRRS Challenger CH8/85
264215CTD or STD cast1987-01-10 16:56:0057.2333 N, 10.05 WRRS Challenger CH9
250533CTD or STD cast1987-04-30 01:03:0057.2333 N, 10.0466 WRRS Challenger CH14
266873CTD or STD cast1988-03-06 01:59:0057.235 N, 10.05 WRRS Challenger CH25
263918CTD or STD cast1988-06-20 03:44:0057.2333 N, 10.0433 WRRS Challenger CH30
265403CTD or STD cast1989-01-24 22:56:0057.2333 N, 10.05 WRRS Discovery D180
265901CTD or STD cast1989-05-06 11:36:0057.2333 N, 10.05 WRV Lough Foyle LF1/89
317684CTD or STD cast1989-08-05 14:34:0057.235 N, 10.0517 WRV Lough Foyle LF2/89
316865CTD or STD cast1989-11-26 08:32:0057.235 N, 10.055 WRRS Charles Darwin CD44
315038CTD or STD cast1990-06-28 00:58:0057.2333 N, 10.0533 WRRS Challenger CH67A
259796CTD or STD cast1990-09-02 07:07:0057.2333 N, 10.05 WRRS Challenger CH71A
382548CTD or STD cast1991-02-27 03:44:0057.2333 N, 10.0517 WRRS Challenger CH75B
316251CTD or STD cast1991-07-02 22:54:0057.2333 N, 10.0517 WRRS Challenger CH81
386537CTD or STD cast1992-09-27 05:37:0057.23 N, 10.0467 WRRS Challenger CH97
385699CTD or STD cast1993-05-16 12:13:0057.2333 N, 10.0467 WRRS Challenger CH103
387829CTD or STD cast1993-09-07 14:56:0057.2333 N, 10.2333 WRRS Challenger CH105
389117CTD or STD cast1994-03-18 13:23:0057.2265 N, 10.0503 WRRS Challenger CH110
389302CTD or STD cast1994-05-03 12:30:0057.2335 N, 10.0512 WRRS Challenger CH112
390886CTD or STD cast1994-08-18 02:24:0057.2335 N, 10.0515 WRRS Challenger CH114
392021CTD or STD cast1994-11-25 01:37:0057.2338 N, 10.0422 WRRS Challenger CH116
435145CTD or STD cast1995-04-22 01:07:0057.2333 N, 10.05 WRRS Charles Darwin CD92B
435366CTD or STD cast1995-04-29 22:23:0057.235 N, 10.0443 WRRS Charles Darwin CD92B
390493CTD or STD cast1995-07-31 00:31:0057.233 N, 10.0467 WRRS Challenger CH120
434098CTD or STD cast1996-01-13 06:59:0057.2333 N, 10.05 WRRS Challenger CH124
1289360Water sample data1996-01-13 06:59:0057.2333 N, 10.05 WRRS Challenger CH124
1014619CTD or STD cast1996-10-01 08:13:0057.22783 N, 10.07367 WRRS Discovery D223A
1850119Water sample data1996-10-01 09:24:0057.22777 N, 10.07372 WRRS Discovery D223A
1070695CTD or STD cast1999-09-12 09:21:0057.2305 N, 10.04133 WRRS Discovery D242
1252027Water sample data1999-09-12 10:01:0057.2305 N, 10.04133 WRRS Discovery D242
1075189CTD or STD cast2000-02-04 00:47:0057.2255 N, 10.05717 WRRS Discovery D245
559173CTD or STD cast2000-05-18 19:45:0057.2333 N, 10.0483 WFRV Scotia 0700S
676835CTD or STD cast2001-05-20 16:58:0057.22933 N, 10.05717 WRRS Discovery D253
626734CTD or STD cast2003-04-18 05:24:0057.236 N, 10.0498 WFRV Scotia 0703S
845015CTD or STD cast2003-07-23 02:48:0057.23502 N, 10.05542 WFS Poseidon PO300_2
667101CTD or STD cast2004-07-13 16:09:0057.23917 N, 10.06233 WFS Poseidon PO314
896445CTD or STD cast2005-10-10 17:24:0057.2313 N, 10.04808 WRRS Charles Darwin CD176
776627CTD or STD cast2006-10-25 19:37:2957.23333 N, 10.04833 WRRS Discovery D312
847476CTD or STD cast2007-08-30 02:26:2557.23438 N, 10.04794 WRRS Discovery D321B
880885CTD or STD cast2008-05-22 22:54:0057.234 N, 10.051 WFRV Scotia 0508S
1616909Water sample data2008-05-22 22:54:0057.234 N, 10.051 WFRV Scotia 0508S
954333CTD or STD cast2009-06-20 05:04:4657.23317 N, 10.04833 WRRS Discovery D340A
1052781CTD or STD cast2010-05-20 10:54:1557.23367 N, 10.03733 WRRS Discovery D351
1930003Currents -subsurface Eulerian2010-05-20 11:03:1257.2334 N, 10.0499 WRRS Discovery D351
1896824Water sample data2010-05-20 11:53:0057.23428 N, 10.03499 WRRS Discovery D351
1195801CTD or STD cast2011-05-31 05:09:2457.2405 N, 10.042 WRRS Discovery D365
1203488CTD or STD cast2012-08-04 01:03:0057.23178 N, 10.04823 WRRS Discovery D379
1220455CTD or STD cast2013-05-20 05:01:1457.2325 N, 10.049 WRRS James Cook JC086
1371211CTD or STD cast2014-07-15 20:21:4257.2341 N, 10.0508 WRRS James Clark Ross JR20140531 (JR302)
1723330CTD or STD cast2015-06-13 09:20:5357.2333 N, 10.0504 WRRS Discovery DY031
1879280Water sample data2015-06-13 10:15:0057.23329 N, 10.05038 WRRS Discovery DY031
1764624CTD or STD cast2016-06-17 03:00:4357.233 N, 10.0536 WRRS Discovery DY052
1765756Currents -subsurface Eulerian2016-06-17 03:00:5957.23302 N, 10.05353 WRRS Discovery DY052
1874957Water sample data2016-06-17 03:53:0057.23303 N, 10.05353 WRRS Discovery DY052