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Metadata Report for BODC Series Reference Number 1722418


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_058
BODC Series Reference 1722418
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-13 06:07
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.29964 N ( 57° 18.0' N )
Longitude 10.38408 W ( 10° 23.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 2195.0 m
Minimum Sensor or Sampling Height 14.0 m
Maximum Sensor or Sampling Height 2204.0 m
Sea Floor Depth 2209.0 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 = 1722418

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 M
CategoryOffshore location
Latitude57° 18.00' N
Longitude10° 22.98' W
Water depth below MSL2340.0 m

Ellett Line/Extended Ellett Line: Station M

Station M 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 M 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 M

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
89949CTD or STD cast1975-05-04 09:00:0057.3 N, 10.3333 WRRS Challenger CH7A/75
89279CTD or STD cast1975-07-05 20:15:0057.305 N, 10.385 WRRS Challenger CH10A/75
90152CTD or STD cast1975-11-08 22:27:0057.3 N, 10.385 WRRS Challenger CH14A/75
90545CTD or STD cast1976-04-02 18:03:0057.2966 N, 10.3816 WRRS Challenger CH5A/76
91211CTD or STD cast1976-05-21 21:37:0057.2983 N, 10.385 WRRS Challenger CH8/76
90987CTD or STD cast1977-03-07 10:05:0057.3 N, 10.3833 WRRS Challenger CH4/77
92005CTD or STD cast1977-04-15 19:52:0057.3 N, 10.3866 WRRS Challenger CH6B/77
94221CTD or STD cast1977-07-24 10:20:0057.2866 N, 10.3933 WRRS Challenger CH11/77
92527CTD or STD cast1978-02-07 07:05:0057.305 N, 10.3866 WRRS Challenger CH2/78
186086CTD or STD cast1978-08-10 05:30:0057.2983 N, 10.37 WRRS Challenger CH11B/78
190860CTD or STD cast1978-09-12 19:32:0057.2783 N, 10.3816 WRRS Challenger CH11D/78
314428CTD or STD cast1978-11-08 05:08:0057.3083 N, 10.3867 WRRS Challenger CH14B/78
98688CTD or STD cast1979-05-21 06:50:0057.2966 N, 10.3883 WRRS Challenger CH7/79
95955CTD or STD cast1979-09-15 00:05:0057.2766 N, 10.3733 WRRS Challenger CH13/79
187643CTD or STD cast1980-03-02 21:52:0057.3 N, 10.3833 WRRS Challenger CH4/80
188947CTD or STD cast1980-05-04 19:10:0057.3 N, 10.3833 WRRS Challenger CH7/80
312735CTD or STD cast1981-01-31 02:22:0057.3 N, 10.383 WRRS Challenger CH2/81
188382CTD or STD cast1981-04-20 17:25:0057.3016 N, 10.3833 WRRS Challenger CH6B/81
189545CTD or STD cast1982-05-09 20:40:0057.3 N, 10.38 WRRS Challenger CH7B/82
193544CTD or STD cast1983-05-25 17:13:0057.3 N, 10.3866 WRRS Challenger CH7B/83
97022CTD or STD cast1983-08-18 09:40:0057.3 N, 10.385 WRRS Challenger CH11/83
313277CTD or STD cast1984-06-28 07:27:0057.3 N, 10.385 WRRS Challenger CH2/84
253948CTD or STD cast1985-05-09 01:33:0057.3 N, 10.3816 WRRS Challenger CH4/85
261254CTD or STD cast1985-08-20 22:53:0057.3 N, 10.385 WRRS Challenger CH8/85
264227CTD or STD cast1987-01-10 19:27:0057.3 N, 10.3833 WRRS Challenger CH9
250521CTD or STD cast1987-04-29 06:47:0057.3 N, 10.3816 WRRS Challenger CH14
266861CTD or STD cast1988-03-05 23:07:0057.3016 N, 10.385 WRRS Challenger CH25
263906CTD or STD cast1988-06-20 01:05:0057.3 N, 10.385 WRRS Challenger CH30
265415CTD or STD cast1989-01-25 01:46:0057.3 N, 10.3833 WRRS Discovery D180
265913CTD or STD cast1989-05-06 14:02:0057.3 N, 10.3833 WRV Lough Foyle LF1/89
317696CTD or STD cast1989-08-05 16:36:0057.3 N, 10.3833 WRV Lough Foyle LF2/89
316877CTD or STD cast1989-11-26 11:09:0057.3 N, 10.385 WRRS Charles Darwin CD44
315026CTD or STD cast1990-06-27 22:13:0057.2983 N, 10.385 WRRS Challenger CH67A
259784CTD or STD cast1990-09-02 03:57:0057.3 N, 10.3833 WRRS Challenger CH71A
382561CTD or STD cast1991-02-27 06:55:0057.3 N, 10.3833 WRRS Challenger CH75B
316263CTD or STD cast1991-07-03 01:40:0057.3 N, 10.385 WRRS Challenger CH81
386549CTD or STD cast1992-09-27 08:48:0057.3 N, 10.3817 WRRS Challenger CH97
385386CTD or STD cast1993-03-15 21:11:0057.2983 N, 10.385 WRRS Challenger CH101B
385675CTD or STD cast1993-05-15 23:24:0057.3 N, 10.3833 WRRS Challenger CH103
387817CTD or STD cast1993-09-07 04:08:0057.3012 N, 10.4033 WRRS Challenger CH105
389129CTD or STD cast1994-03-18 19:32:0057.3 N, 10.3833 WRRS Challenger CH110
389295CTD or STD cast1994-05-03 05:04:0057.3 N, 10.3833 WRRS Challenger CH112
390874CTD or STD cast1994-08-17 21:10:0057.3 N, 10.3833 WRRS Challenger CH114
392033CTD or STD cast1994-11-25 04:30:0057.3 N, 10.3833 WRRS Challenger CH116
392045CTD or STD cast1994-11-25 05:32:0057.3 N, 10.3833 WRRS Challenger CH116
435157CTD or STD cast1995-04-22 05:00:0057.3 N, 10.3833 WRRS Charles Darwin CD92B
435354CTD or STD cast1995-04-29 17:48:0057.3 N, 10.3833 WRRS Charles Darwin CD92B
390500CTD or STD cast1995-07-31 06:29:0057.2988 N, 10.3842 WRRS Challenger CH120
434105CTD or STD cast1996-01-13 10:51:0057.3 N, 10.3833 WRRS Challenger CH124
1014620CTD or STD cast1996-10-01 11:41:0057.30533 N, 10.37583 WRRS Discovery D223A
1850120Water sample data1996-10-01 12:51:0057.3054 N, 10.37583 WRRS Discovery D223A
1008036CTD or STD cast1997-09-13 23:35:0057.28417 N, 10.39633 WRRS Discovery D230
1305017Water sample data1997-09-14 00:35:0057.28424 N, 10.39631 WRRS Discovery D230
1020649CTD or STD cast1998-05-26 06:49:0057.29883 N, 10.38567 WRRS Discovery D233
1306291Water sample data1998-05-26 07:50:0057.29879 N, 10.38565 WRRS Discovery D233
1849456Water sample data1998-05-26 07:50:0057.29879 N, 10.38565 WRRS Discovery D233
1076980CTD or STD cast1999-06-01 10:47:0057.2995 N, 10.39783 WNot applicable
1070702CTD or STD cast1999-09-12 13:46:0057.2945 N, 10.37167 WRRS Discovery D242
1252039Water sample data1999-09-12 14:23:0057.2945 N, 10.37167 WRRS Discovery D242
1075190CTD or STD cast2000-02-04 04:50:0057.29917 N, 10.3985 WRRS Discovery D245
559161CTD or STD cast2000-05-18 17:14:0057.2967 N, 10.3817 WFRV Scotia 0700S
1230450Water sample data2000-05-18 17:14:0057.29767 N, 10.38317 WFRV Scotia 0700S
676847CTD or STD cast2001-05-20 21:47:0057.2895 N, 10.3765 WRRS Discovery D253
626746CTD or STD cast2003-04-18 07:55:0057.3002 N, 10.384 WFRV Scotia 0703S
845003CTD or STD cast2003-07-22 22:14:0057.29938 N, 10.3825 WFS Poseidon PO300_2
667113CTD or STD cast2004-07-13 19:55:0057.3015 N, 10.38233 WFS Poseidon PO314
896457CTD or STD cast2005-10-10 22:50:0057.30272 N, 10.38124 WRRS Charles Darwin CD176
776615CTD or STD cast2006-10-25 15:41:0657.30333 N, 10.379 WRRS Discovery D312
847464CTD or STD cast2007-08-29 22:23:3657.29953 N, 10.3795 WRRS Discovery D321B
880873CTD or STD cast2008-05-22 18:54:0057.30167 N, 10.38117 WFRV Scotia 0508S
1616891Water sample data2008-05-22 18:54:0057.30167 N, 10.38117 WFRV Scotia 0508S
954321CTD or STD cast2009-06-20 01:00:1157.30187 N, 10.38222 WRRS Discovery D340A
1052768CTD or STD cast2010-05-20 07:28:2957.28717 N, 10.38133 WRRS Discovery D351
1929991Currents -subsurface Eulerian2010-05-20 07:29:1157.2955 N, 10.3847 WRRS Discovery D351
1896812Water sample data2010-05-20 08:28:0057.2854 N, 10.37933 WRRS Discovery D351
1195794CTD or STD cast2011-05-31 01:49:1657.28767 N, 10.386 WRRS Discovery D365
1203507CTD or STD cast2012-08-04 05:05:0057.29853 N, 10.38556 WRRS Discovery D379
1220443CTD or STD cast2013-05-20 01:18:4157.2984 N, 10.3904 WRRS James Cook JC086
1220584CTD or STD cast2013-05-22 09:35:1957.2976 N, 10.3853 WRRS James Cook JC086
1371192CTD or STD cast2014-07-15 17:13:4357.3002 N, 10.3824 WRRS James Clark Ross JR20140531 (JR302)
1723329CTD or STD cast2015-06-13 06:06:5557.2996 N, 10.384 WRRS Discovery DY031
1879279Water sample data2015-06-13 06:58:0057.29964 N, 10.38406 WRRS Discovery DY031
1764612CTD or STD cast2016-06-16 23:34:0057.2989 N, 10.386 WRRS Discovery DY052
1765744Currents -subsurface Eulerian2016-06-16 23:34:1957.29866 N, 10.38624 WRRS Discovery DY052
1874945Water sample data2016-06-17 00:29:0057.29864 N, 10.38626 WRRS Discovery DY052
1765793Currents -subsurface Eulerian2016-06-18 18:48:4057.2458 N, 10.3516 WRRS Discovery DY052
1764661CTD or STD cast2016-06-18 18:52:0657.2458 N, 10.3516 WRRS Discovery DY052