Metadata Report for BODC Series Reference Number 1722314


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_049
BODC Series Reference 1722314
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-10 16:49
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.54206 N ( 57° 32.5' N )
Longitude 12.86588 W ( 12° 52.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 1085.0 m
Minimum Sensor or Sampling Height 6.0 m
Maximum Sensor or Sampling Height 1086.0 m
Sea Floor Depth 1091.0 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 = 1722314

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 D
CategoryOffshore location
Latitude57° 32.52' N
Longitude12° 52.02' W
Water depth below MSL1000.0 m

Ellett Line/Extended Ellett Line: Station D

Station D 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 D 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 D

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
90256CTD or STD cast1975-11-09 16:20:0057.5366 N, 12.8733 WRRS Challenger CH14A/75
91303CTD or STD cast1976-05-23 05:17:0057.5433 N, 12.87 WRRS Challenger CH8/76
90883CTD or STD cast1977-03-06 11:20:0057.54 N, 12.8633 WRRS Challenger CH4/77
92078CTD or STD cast1977-04-16 13:33:0057.545 N, 12.8716 WRRS Challenger CH6B/77
94116CTD or STD cast1977-07-23 15:30:0057.5483 N, 12.8816 WRRS Challenger CH11/77
88829CTD or STD cast1977-08-22 21:52:0057.54 N, 12.8666 WRRS Challenger CH13/77
92331CTD or STD cast1978-02-05 00:14:0057.5383 N, 12.895 WRRS Challenger CH2/78
92435CTD or STD cast1978-02-06 13:45:0057.55 N, 12.8766 WRRS Challenger CH2/78
94417CTD or STD cast1978-04-16 00:48:0057.5333 N, 12.8483 WRRS Challenger CH6/78
95200CTD or STD cast1978-06-05 04:47:0057.5416 N, 12.8616 WRRS Challenger CH9/78
185998CTD or STD cast1978-08-09 12:30:0057.5516 N, 12.87 WRRS Challenger CH11B/78
187483CTD or STD cast1980-03-01 22:10:0057.5433 N, 12.8816 WRRS Challenger CH4/80
188843CTD or STD cast1980-05-03 14:52:0057.5416 N, 12.8633 WRRS Challenger CH7/80
188289CTD or STD cast1981-04-19 22:45:0057.5416 N, 12.8666 WRRS Challenger CH6B/81
189397CTD or STD cast1982-05-08 21:12:0057.5433 N, 12.865 WRRS Challenger CH7B/82
96910CTD or STD cast1983-08-17 15:40:0057.5416 N, 12.8583 WRRS Challenger CH11/83
313382CTD or STD cast1984-06-29 07:00:0057.54 N, 12.865 WRRS Challenger CH2/84
257384CTD or STD cast1984-11-21 01:13:0057.5433 N, 12.8683 WRRS Challenger CH10/84
258283CTD or STD cast1985-01-25 18:35:0057.5433 N, 12.8666 WRRS Challenger CH1/85
254048CTD or STD cast1985-05-09 19:54:0057.5433 N, 12.865 WRRS Challenger CH4/85
261358CTD or STD cast1985-08-21 19:36:0057.5433 N, 12.8633 WRRS Challenger CH8/85
250416CTD or STD cast1987-04-28 10:49:0057.5333 N, 12.85 WRRS Challenger CH14
265519CTD or STD cast1989-01-25 22:47:0057.55 N, 12.8666 WRRS Discovery D180
266001CTD or STD cast1989-05-07 07:14:0057.55 N, 12.8666 WRV Lough Foyle LF1/89
317788CTD or STD cast1989-08-06 09:22:0057.5417 N, 12.8683 WRV Lough Foyle LF2/89
316970CTD or STD cast1989-11-27 07:24:0057.5417 N, 12.87 WRRS Charles Darwin CD44
314926CTD or STD cast1990-06-27 04:12:0057.54 N, 12.8683 WRRS Challenger CH67A
259667CTD or STD cast1990-09-01 08:31:0057.5333 N, 12.8666 WRRS Challenger CH71A
382665CTD or STD cast1991-02-28 05:57:0057.5417 N, 12.8667 WRRS Challenger CH75B
316367CTD or STD cast1991-07-03 22:19:0057.54 N, 12.865 WRRS Challenger CH81
386630CTD or STD cast1992-09-28 14:57:0057.5417 N, 12.87 WRRS Challenger CH97
385583CTD or STD cast1993-05-14 23:33:0057.5433 N, 12.8633 WRRS Challenger CH103
387725CTD or STD cast1993-09-05 13:02:0057.5405 N, 12.8587 WRRS Challenger CH105
389191CTD or STD cast1994-05-02 05:37:0057.5417 N, 12.8667 WRRS Challenger CH112
390978CTD or STD cast1994-08-19 08:06:0057.5417 N, 12.8667 WRRS Challenger CH114
435250CTD or STD cast1995-04-27 17:05:0057.5417 N, 12.8667 WRRS Charles Darwin CD92B
390628CTD or STD cast1995-08-01 20:42:0057.5407 N, 12.8682 WRRS Challenger CH120
1014724CTD or STD cast1996-10-02 18:36:0057.54117 N, 12.86833 WRRS Discovery D223A
1850224Water sample data1996-10-02 19:13:0057.54119 N, 12.86837 WRRS Discovery D223A
1007997CTD or STD cast1997-09-13 07:53:0057.54917 N, 12.87133 WRRS Discovery D230
1304966Water sample data1997-09-13 08:31:0057.5492 N, 12.87135 WRRS Discovery D230
1020594CTD or STD cast1998-05-25 14:26:0057.53867 N, 12.86633 WRRS Discovery D233
1306230Water sample data1998-05-25 15:00:0057.5387 N, 12.86625 WRRS Discovery D233
1849407Water sample data1998-05-25 15:00:0057.5387 N, 12.86625 WRRS Discovery D233
1076931CTD or STD cast1999-05-30 16:13:0057.52883 N, 12.86283 WNot applicable
1071834CTD or STD cast1999-09-13 18:54:0057.54483 N, 12.86733 WRRS Discovery D242
1252132Water sample data1999-09-13 19:10:0057.54483 N, 12.86733 WRRS Discovery D242
559056CTD or STD cast2000-05-17 21:38:0057.535 N, 12.8667 WFRV Scotia 0700S
676939CTD or STD cast2001-05-21 22:25:0057.52817 N, 12.86267 WRRS Discovery D253
626851CTD or STD cast2003-04-19 03:07:0057.5402 N, 12.8663 WFRV Scotia 0703S
844903CTD or STD cast2003-07-21 06:05:0057.53175 N, 12.86652 WFS Poseidon PO300_2
667205CTD or STD cast2004-07-14 23:34:0057.53833 N, 12.86817 WFS Poseidon PO314
896550CTD or STD cast2005-10-12 11:14:0057.54196 N, 12.86636 WRRS Charles Darwin CD176
776492CTD or STD cast2006-10-22 14:53:0057.54017 N, 12.86967 WRRS Discovery D312
847403CTD or STD cast2007-08-28 20:48:4257.5425 N, 12.8726 WRRS Discovery D321B
880768CTD or STD cast2008-05-21 15:14:0057.53867 N, 12.86817 WFRV Scotia 0508S
1616798Water sample data2008-05-21 15:14:0057.53867 N, 12.86817 WFRV Scotia 0508S
954216CTD or STD cast2009-06-16 15:07:4557.5403 N, 12.86299 WRRS Discovery D340A
1052688CTD or STD cast2010-05-19 00:34:4957.54917 N, 12.87017 WRRS Discovery D351
1896719Water sample data2010-05-19 01:17:0057.54698 N, 12.87116 WRRS Discovery D351
1195690CTD or STD cast2011-05-30 01:52:0657.53433 N, 12.86917 WRRS Discovery D365
1203600CTD or STD cast2012-08-05 10:53:0057.54031 N, 12.86281 WRRS Discovery D379
1220338CTD or STD cast2013-05-18 18:14:2657.5417 N, 12.8666 WRRS James Cook JC086
1371099CTD or STD cast2014-07-14 19:37:1557.542 N, 12.8667 WRRS James Clark Ross JR20140531 (JR302)
1723237CTD or STD cast2015-06-10 16:48:4057.5421 N, 12.8659 WRRS Discovery DY031
1879175Water sample data2015-06-10 17:23:0057.54208 N, 12.86588 WRRS Discovery DY031
1764519CTD or STD cast2016-06-15 21:22:1557.5419 N, 12.8683 WRRS Discovery DY052
1765640Currents -subsurface Eulerian2016-06-15 21:22:4557.5419 N, 12.86831 WRRS Discovery DY052
1874841Water sample data2016-06-15 21:56:0057.5419 N, 12.86831 WRRS Discovery DY052