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Metadata Report for BODC Series Reference Number 1722406


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_057
BODC Series Reference 1722406
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-13 02:55
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.36718 N ( 57° 22.0' N )
Longitude 10.66584 W ( 10° 40.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 2105.0 m
Minimum Sensor or Sampling Height 1.0 m
Maximum Sensor or Sampling Height 2101.0 m
Sea Floor Depth 2106.0 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 = 1722406

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 L
CategoryOffshore location
Latitude57° 22.02' N
Longitude10° 40.02' W
Water depth below MSL2076.0 m

Ellett Line/Extended Ellett Line: Station L

Station L 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 L 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 L

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
89280CTD or STD cast1975-07-05 22:35:0057.3566 N, 10.6466 WRRS Challenger CH10A/75
90164CTD or STD cast1975-11-09 00:41:0057.365 N, 10.6683 WRRS Challenger CH14A/75
90533CTD or STD cast1976-04-02 15:55:0057.365 N, 10.6666 WRRS Challenger CH5A/76
91223CTD or STD cast1976-05-22 08:31:0057.3683 N, 10.6733 WRRS Challenger CH8/76
92017CTD or STD cast1977-04-15 22:15:0057.365 N, 10.67 WRRS Challenger CH6B/77
94208CTD or STD cast1977-07-24 08:04:0057.3666 N, 10.6716 WRRS Challenger CH11/77
88749CTD or STD cast1977-08-22 03:47:0057.3516 N, 10.6433 WRRS Challenger CH13/77
92515CTD or STD cast1978-02-07 04:40:0057.3766 N, 10.6833 WRRS Challenger CH2/78
94510CTD or STD cast1978-04-16 19:25:0057.3516 N, 10.6833 WRRS Challenger CH6/78
94811CTD or STD cast1978-04-19 08:20:0057.3316 N, 10.6716 WRRS Challenger CH6/78
95297CTD or STD cast1978-06-05 20:44:0057.3633 N, 10.6716 WRRS Challenger CH9/78
186074CTD or STD cast1978-08-10 03:20:0057.3666 N, 10.665 WRRS Challenger CH11B/78
190859CTD or STD cast1978-09-12 17:00:0057.3666 N, 10.6666 WRRS Challenger CH11D/78
314416CTD or STD cast1978-11-08 02:35:0057.3667 N, 10.675 WRRS Challenger CH14B/78
98676CTD or STD cast1979-05-20 20:28:0057.3666 N, 10.6633 WRRS Challenger CH7/79
95967CTD or STD cast1979-09-15 02:45:0057.3683 N, 10.6466 WRRS Challenger CH13/79
187631CTD or STD cast1980-03-02 19:40:0057.3666 N, 10.67 WRRS Challenger CH4/80
188935CTD or STD cast1980-05-04 17:00:0057.3666 N, 10.6566 WRRS Challenger CH7/80
188370CTD or STD cast1981-04-20 15:15:0057.3616 N, 10.6433 WRRS Challenger CH6B/81
187169CTD or STD cast1981-10-15 04:10:0057.3683 N, 10.6666 WRRS Challenger CH15/81
189244CTD or STD cast1982-04-29 09:20:0057.3683 N, 10.665 WRRS Challenger CH7A/82
189256CTD or STD cast1982-04-29 11:08:0057.3833 N, 10.6666 WRRS Challenger CH7A/82
189521CTD or STD cast1982-05-09 17:17:0057.3666 N, 10.6683 WRRS Challenger CH7B/82
193556CTD or STD cast1983-05-25 19:58:0057.365 N, 10.665 WRRS Challenger CH7B/83
97010CTD or STD cast1983-08-18 07:10:0057.3666 N, 10.6583 WRRS Challenger CH11/83
313289CTD or STD cast1984-06-28 10:19:0057.3733 N, 10.6967 WRRS Challenger CH2/84
258326CTD or STD cast1985-01-26 08:14:0057.36 N, 10.6616 WRRS Challenger CH1/85
253961CTD or STD cast1985-05-09 03:55:0057.3666 N, 10.6783 WRRS Challenger CH4/85
261266CTD or STD cast1985-08-21 01:27:0057.3666 N, 10.6666 WRRS Challenger CH8/85
264239CTD or STD cast1987-01-10 21:35:0057.3666 N, 10.6666 WRRS Challenger CH9
250508CTD or STD cast1987-04-29 03:53:0057.365 N, 10.665 WRRS Challenger CH14
263899CTD or STD cast1988-06-19 22:30:0057.3666 N, 10.665 WRRS Challenger CH30
265427CTD or STD cast1989-01-25 04:42:0057.3666 N, 10.65 WRRS Discovery D180
265925CTD or STD cast1989-05-06 16:23:0057.3666 N, 10.6666 WRV Lough Foyle LF1/89
317703CTD or STD cast1989-08-05 19:12:0057.3667 N, 10.6667 WRV Lough Foyle LF2/89
316889CTD or STD cast1989-11-26 13:59:0057.3667 N, 10.6667 WRRS Charles Darwin CD44
315014CTD or STD cast1990-06-27 20:10:0057.3633 N, 10.6683 WRRS Challenger CH67A
259772CTD or STD cast1990-09-02 01:21:0057.3666 N, 10.6666 WRRS Challenger CH71A
382573CTD or STD cast1991-02-27 10:00:0057.3667 N, 10.67 WRRS Challenger CH75B
316275CTD or STD cast1991-07-03 04:42:0057.3717 N, 10.6717 WRRS Challenger CH81
386550CTD or STD cast1992-09-27 19:34:0057.3667 N, 10.6667 WRRS Challenger CH97
385374CTD or STD cast1993-03-15 18:23:0057.365 N, 10.6717 WRRS Challenger CH101B
385687CTD or STD cast1993-05-16 02:42:0057.3667 N, 10.67 WRRS Challenger CH103
387805CTD or STD cast1993-09-06 19:49:0057.3655 N, 10.667 WRRS Challenger CH105
389283CTD or STD cast1994-05-03 01:56:0057.3687 N, 10.686 WRRS Challenger CH112
390898CTD or STD cast1994-08-18 06:16:0057.3667 N, 10.6667 WRRS Challenger CH114
392057CTD or STD cast1994-11-25 15:28:0057.3667 N, 10.6593 WRRS Challenger CH116
435169CTD or STD cast1995-04-22 11:16:0057.3667 N, 10.6667 WRRS Charles Darwin CD92B
390512CTD or STD cast1995-07-31 11:59:0057.3628 N, 10.6548 WRRS Challenger CH120
434117CTD or STD cast1996-01-13 14:13:0057.3667 N, 10.6667 WRRS Challenger CH124
434271CTD or STD cast1996-01-16 03:36:0057.3667 N, 10.6667 WRRS Challenger CH124
1014632CTD or STD cast1996-10-01 15:12:0057.35933 N, 10.65633 WRRS Discovery D223A
1850132Water sample data1996-10-01 16:09:0057.35926 N, 10.6563 WRRS Discovery D223A
1070714CTD or STD cast1999-09-12 17:51:0057.37183 N, 10.65433 WRRS Discovery D242
1252040Water sample data1999-09-12 18:20:0057.37183 N, 10.65433 WRRS Discovery D242
1075208CTD or STD cast2000-02-04 15:53:0057.36283 N, 10.66933 WRRS Discovery D245
559148CTD or STD cast2000-05-18 14:19:0057.3583 N, 10.6767 WFRV Scotia 0700S
676859CTD or STD cast2001-05-21 01:04:0057.36167 N, 10.653 WRRS Discovery D253
626758CTD or STD cast2003-04-18 10:31:0057.3667 N, 10.6647 WFRV Scotia 0703S
844988CTD or STD cast2003-07-22 18:07:0057.36962 N, 10.6686 WFS Poseidon PO300_2
667125CTD or STD cast2004-07-13 23:31:0057.3675 N, 10.67217 WFS Poseidon PO314
896469CTD or STD cast2005-10-11 03:08:0057.36704 N, 10.66806 WRRS Charles Darwin CD176
776603CTD or STD cast2006-10-25 10:33:5057.36833 N, 10.66733 WRRS Discovery D312
847882CTD or STD cast2007-08-29 18:55:1857.36733 N, 10.67185 WRRS Discovery D321B
880861CTD or STD cast2008-05-22 15:17:0057.36133 N, 10.67117 WFRV Scotia 0508S
1616878Water sample data2008-05-22 15:17:0057.36133 N, 10.67117 WFRV Scotia 0508S
954308CTD or STD cast2009-06-19 21:07:0357.36612 N, 10.66851 WRRS Discovery D340A
1052756CTD or STD cast2010-05-20 03:55:1457.36067 N, 10.66983 WRRS Discovery D351
1929978Currents -subsurface Eulerian2010-05-20 03:56:0357.3662 N, 10.6699 WRRS Discovery D351
1896800Water sample data2010-05-20 04:56:0057.35942 N, 10.66956 WRRS Discovery D351
1195782CTD or STD cast2011-05-30 22:37:3757.35733 N, 10.6765 WRRS Discovery D365
1203519CTD or STD cast2012-08-04 08:44:0057.36588 N, 10.66485 WRRS Discovery D379
1220431CTD or STD cast2013-05-19 21:57:4457.3659 N, 10.6706 WRRS James Cook JC086
1371180CTD or STD cast2014-07-15 14:22:0857.367 N, 10.667 WRRS James Clark Ross JR20140531 (JR302)
1723317CTD or STD cast2015-06-13 02:54:4557.3672 N, 10.6657 WRRS Discovery DY031
1879267Water sample data2015-06-13 03:47:0057.3672 N, 10.66574 WRRS Discovery DY031
1764600CTD or STD cast2016-06-16 20:20:2957.3667 N, 10.6676 WRRS Discovery DY052
1765732Currents -subsurface Eulerian2016-06-16 20:20:4657.36668 N, 10.66763 WRRS Discovery DY052
1874933Water sample data2016-06-16 21:12:0057.36667 N, 10.66763 WRRS Discovery DY052