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Metadata Report for BODC Series Reference Number 1722302


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_048
BODC Series Reference 1722302
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-10 15:19
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.55090 N ( 57° 33.1' N )
Longitude 12.99792 W ( 12° 59.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 285.0 m
Minimum Sensor or Sampling Height 17.0 m
Maximum Sensor or Sampling Height 297.0 m
Sea Floor Depth 302.0 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 = 1722302

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 C
CategoryOffshore location
Latitude57° 33.00' N
Longitude13° 0.00' W
Water depth below MSL330.0 m

Ellett Line/Extended Ellett Line: Station C

Station C 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 C 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 C

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
89384CTD or STD cast1975-07-06 20:15:0057.5566 N, 13.01 WRRS Challenger CH10A/75
90268CTD or STD cast1975-11-09 18:37:0057.55 N, 13.005 WRRS Challenger CH14A/75
90428CTD or STD cast1976-04-01 22:18:0057.55 N, 12.9966 WRRS Challenger CH5A/76
91315CTD or STD cast1976-05-23 07:10:0057.5483 N, 13.0066 WRRS Challenger CH8/76
90871CTD or STD cast1977-03-06 10:13:0057.5483 N, 12.9983 WRRS Challenger CH4/77
92091CTD or STD cast1977-04-16 17:03:0057.555 N, 12.9966 WRRS Challenger CH6B/77
94104CTD or STD cast1977-07-23 14:32:0057.55 N, 13.0 WRRS Challenger CH11/77
88830CTD or STD cast1977-08-22 23:19:0057.5433 N, 12.9716 WRRS Challenger CH13/77
92318CTD or STD cast1978-02-04 23:03:0057.55 N, 13.0 WRRS Challenger CH2/78
92423CTD or STD cast1978-02-06 12:38:0057.5566 N, 13.0 WRRS Challenger CH2/78
94405CTD or STD cast1978-04-15 22:37:0057.5433 N, 12.985 WRRS Challenger CH6/78
95193CTD or STD cast1978-06-05 03:55:0057.5616 N, 13.0 WRRS Challenger CH9/78
185986CTD or STD cast1978-08-09 11:16:0057.5633 N, 13.0033 WRRS Challenger CH11B/78
187458CTD or STD cast1980-03-01 20:17:0057.55 N, 13.005 WRRS Challenger CH4/80
188831CTD or STD cast1980-05-03 14:00:0057.5483 N, 12.9966 WRRS Challenger CH7/80
188277CTD or STD cast1981-04-19 21:45:0057.55 N, 13.0016 WRRS Challenger CH6B/81
189385CTD or STD cast1982-05-08 20:10:0057.55 N, 13.0 WRRS Challenger CH7B/82
96909CTD or STD cast1983-08-17 14:36:0057.5383 N, 12.9916 WRRS Challenger CH11/83
313394CTD or STD cast1984-06-29 08:30:0057.55 N, 12.9983 WRRS Challenger CH2/84
257396CTD or STD cast1984-11-21 02:36:0057.5516 N, 13.0 WRRS Challenger CH10/84
254061CTD or STD cast1985-05-09 20:57:0057.545 N, 13.0083 WRRS Challenger CH4/85
261371CTD or STD cast1985-08-21 20:51:0057.55 N, 12.9983 WRRS Challenger CH8/85
250404CTD or STD cast1987-04-28 09:42:0057.55 N, 13.0 WRRS Challenger CH14
265520CTD or STD cast1989-01-26 00:29:0057.55 N, 13.0 WRRS Discovery D180
266013CTD or STD cast1989-05-07 08:15:0057.55 N, 13.0 WRV Lough Foyle LF1/89
317807CTD or STD cast1989-08-06 10:26:0057.55 N, 13.0133 WRV Lough Foyle LF2/89
316982CTD or STD cast1989-11-27 08:50:0057.55 N, 13.005 WRRS Charles Darwin CD44
314914CTD or STD cast1990-06-27 02:59:0057.55 N, 13.0 WRRS Challenger CH67A
259643CTD or STD cast1990-09-01 06:16:0057.55 N, 13.0 WRRS Challenger CH71A
259655CTD or STD cast1990-09-01 07:31:0057.55 N, 12.9333 WRRS Challenger CH71A
382677CTD or STD cast1991-02-28 07:34:0057.5517 N, 12.9983 WRRS Challenger CH75B
316379CTD or STD cast1991-07-03 23:50:0057.5517 N, 13.0 WRRS Challenger CH81
386642CTD or STD cast1992-09-28 16:48:0057.5483 N, 13.0017 WRRS Challenger CH97
385571CTD or STD cast1993-05-14 22:30:0057.5517 N, 13.0 WRRS Challenger CH103
387713CTD or STD cast1993-09-05 10:28:0057.55 N, 13.003 WRRS Challenger CH105
389178CTD or STD cast1994-05-02 04:15:0057.55 N, 13.0 WRRS Challenger CH112
390991CTD or STD cast1994-08-19 10:21:0057.55 N, 13.0 WRRS Challenger CH114
435249CTD or STD cast1995-04-27 15:31:0057.55 N, 13.0 WRRS Charles Darwin CD92B
390616CTD or STD cast1995-08-01 18:25:0057.55 N, 13.0 WRRS Challenger CH120
1014736CTD or STD cast1996-10-02 20:47:0057.5495 N, 13.009 WRRS Discovery D223A
1850236Water sample data1996-10-02 21:04:0057.54945 N, 13.00892 WRRS Discovery D223A
1076918CTD or STD cast1999-05-30 14:47:0057.5455 N, 13.0 WNot applicable
1070806CTD or STD cast1999-09-13 20:53:0057.55883 N, 12.99117 WRRS Discovery D242
1252144Water sample data1999-09-13 21:01:0057.55883 N, 12.99117 WRRS Discovery D242
1075270CTD or STD cast2000-02-15 06:13:0057.54633 N, 13.0055 WRRS Discovery D245
559044CTD or STD cast2000-05-17 20:41:0057.55 N, 13.0017 WFRV Scotia 0700S
1230401Water sample data2000-05-17 20:41:0057.5515 N, 13.00267 WFRV Scotia 0700S
676940CTD or STD cast2001-05-22 00:12:0057.54983 N, 12.99817 WRRS Discovery D253
626863CTD or STD cast2003-04-19 04:40:0057.5493 N, 12.997 WFRV Scotia 0703S
844896CTD or STD cast2003-07-21 04:30:0057.54857 N, 13.0013 WFS Poseidon PO300_2
667217CTD or STD cast2004-07-15 01:41:0057.5515 N, 13.00067 WFS Poseidon PO314
896586CTD or STD cast2005-10-12 20:23:0057.54942 N, 12.99748 WRRS Charles Darwin CD176
776480CTD or STD cast2006-10-22 12:09:4057.54833 N, 12.99333 WRRS Discovery D312
847396CTD or STD cast2007-08-28 19:14:2457.54866 N, 12.99904 WRRS Discovery D321B
880756CTD or STD cast2008-05-21 14:06:0057.55283 N, 12.9935 WFRV Scotia 0508S
1616786Water sample data2008-05-21 14:06:0057.55283 N, 12.9935 WFRV Scotia 0508S
954204CTD or STD cast2009-06-16 13:10:4457.55464 N, 12.99333 WRRS Discovery D340A
1052676CTD or STD cast2010-05-18 23:06:0557.55133 N, 13.00067 WRRS Discovery D351
1929886Currents -subsurface Eulerian2010-05-18 23:06:5357.5516 N, 13.0005 WRRS Discovery D351
1896707Water sample data2010-05-18 23:26:0057.55221 N, 12.99985 WRRS Discovery D351
1195689CTD or STD cast2011-05-30 00:36:2657.54883 N, 12.9995 WRRS Discovery D365
1203612CTD or STD cast2012-08-05 13:18:0057.54826 N, 12.99715 WRRS Discovery D379
1220326CTD or STD cast2013-05-18 16:44:1357.55 N, 12.9998 WRRS James Cook JC086
1371087CTD or STD cast2014-07-14 18:13:4157.5503 N, 12.9993 WRRS James Clark Ross JR20140531 (JR302)
1723225CTD or STD cast2015-06-10 15:18:4157.5509 N, 12.9979 WRRS Discovery DY031
1879163Water sample data2015-06-10 15:39:0057.55089 N, 12.99791 WRRS Discovery DY031
1764507CTD or STD cast2016-06-15 19:49:1157.5498 N, 13.0003 WRRS Discovery DY052
1765639Currents -subsurface Eulerian2016-06-15 19:49:4657.5498 N, 13.00028 WRRS Discovery DY052
1874828Water sample data2016-06-15 20:05:0057.5498 N, 13.00027 WRRS Discovery DY052