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Metadata Report for BODC Series Reference Number 1722399


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_056
BODC Series Reference 1722399
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-13 01:06
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.39978 N ( 57° 24.0' N )
Longitude 10.86726 W ( 10° 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 775.0 m
Minimum Sensor or Sampling Height 16.0 m
Maximum Sensor or Sampling Height 786.0 m
Sea Floor Depth 791.0 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 = 1722399

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 K
CategoryOffshore location
Latitude57° 24.00' N
Longitude10° 52.02' W
Water depth below MSL850.0 m

Ellett Line/Extended Ellett Line: Station K

Station K 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 K 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 K

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
89950CTD or STD cast1975-05-04 12:32:0057.4 N, 10.8666 WRRS Challenger CH7A/75
89292CTD or STD cast1975-07-06 00:28:0057.4 N, 10.8666 WRRS Challenger CH10A/75
90176CTD or STD cast1975-11-09 02:33:0057.3983 N, 10.8683 WRRS Challenger CH14A/75
90521CTD or STD cast1976-04-02 14:19:0057.4033 N, 10.8666 WRRS Challenger CH5A/76
91235CTD or STD cast1976-05-22 11:53:0057.3933 N, 10.8683 WRRS Challenger CH8/76
90963CTD or STD cast1977-03-07 01:07:0057.4 N, 10.8666 WRRS Challenger CH4/77
92029CTD or STD cast1977-04-16 00:08:0057.3916 N, 10.8916 WRRS Challenger CH6B/77
94190CTD or STD cast1977-07-24 06:40:0057.4 N, 10.8666 WRRS Challenger CH11/77
88750CTD or STD cast1977-08-22 06:27:0057.3983 N, 10.8633 WRRS Challenger CH13/77
92503CTD or STD cast1978-02-07 03:20:0057.4183 N, 10.9183 WRRS Challenger CH2/78
94509CTD or STD cast1978-04-16 18:02:0057.385 N, 10.885 WRRS Challenger CH6/78
94792CTD or STD cast1978-04-19 07:08:0057.3883 N, 10.86 WRRS Challenger CH6/78
95285CTD or STD cast1978-06-05 19:22:0057.4033 N, 10.8416 WRRS Challenger CH9/78
186062CTD or STD cast1978-08-10 02:05:0057.4 N, 10.865 WRRS Challenger CH11B/78
190847CTD or STD cast1978-09-12 15:27:0057.3916 N, 10.87 WRRS Challenger CH11D/78
314404CTD or STD cast1978-11-08 00:55:0057.4133 N, 10.875 WRRS Challenger CH14B/78
98664CTD or STD cast1979-05-20 18:53:0057.4 N, 10.8666 WRRS Challenger CH7/79
95979CTD or STD cast1979-09-15 05:30:0057.3866 N, 10.86 WRRS Challenger CH13/79
187606CTD or STD cast1980-03-02 17:09:0057.3983 N, 10.865 WRRS Challenger CH4/80
188923CTD or STD cast1980-05-04 15:08:0057.4 N, 10.8666 WRRS Challenger CH7/80
188369CTD or STD cast1981-04-20 13:40:0057.3916 N, 10.865 WRRS Challenger CH6B/81
187157CTD or STD cast1981-10-15 02:25:0057.4 N, 10.8666 WRRS Challenger CH15/81
189268CTD or STD cast1982-04-29 12:23:0057.4 N, 10.8666 WRRS Challenger CH7A/82
189490CTD or STD cast1982-05-09 15:08:0057.3983 N, 10.8666 WRRS Challenger CH7B/82
193568CTD or STD cast1983-05-25 22:05:0057.4 N, 10.865 WRRS Challenger CH7B/83
97009CTD or STD cast1983-08-18 05:42:0057.4 N, 10.865 WRRS Challenger CH11/83
313290CTD or STD cast1984-06-28 12:20:0057.385 N, 10.865 WRRS Challenger CH2/84
313308CTD or STD cast1984-06-28 13:52:0057.385 N, 10.865 WRRS Challenger CH2/84
253973CTD or STD cast1985-05-09 05:45:0057.4 N, 10.8666 WRRS Challenger CH4/85
261278CTD or STD cast1985-08-21 03:39:0057.3983 N, 10.8716 WRRS Challenger CH8/85
264240CTD or STD cast1987-01-10 23:59:0057.4 N, 10.8666 WRRS Challenger CH9
250490CTD or STD cast1987-04-29 02:13:0057.3983 N, 10.8683 WRRS Challenger CH14
263887CTD or STD cast1988-06-19 21:02:0057.3983 N, 10.8616 WRRS Challenger CH30
265439CTD or STD cast1989-01-25 07:29:0057.4 N, 10.8666 WRRS Discovery D180
265937CTD or STD cast1989-05-06 18:13:0057.4 N, 10.8666 WRV Lough Foyle LF1/89
317715CTD or STD cast1989-08-05 20:57:0057.4 N, 10.8733 WRV Lough Foyle LF2/89
316890CTD or STD cast1989-11-26 16:16:0057.4 N, 10.86 WRRS Charles Darwin CD44
315002CTD or STD cast1990-06-27 18:42:0057.4 N, 10.865 WRRS Challenger CH67A
259760CTD or STD cast1990-09-01 23:47:0057.4 N, 10.8666 WRRS Challenger CH71A
382585CTD or STD cast1991-02-27 12:42:0057.3967 N, 10.8667 WRRS Challenger CH75B
316287CTD or STD cast1991-07-03 07:03:0057.4017 N, 10.8667 WRRS Challenger CH81
386562CTD or STD cast1992-09-27 21:47:0057.4 N, 10.8667 WRRS Challenger CH97
385663CTD or STD cast1993-05-15 16:50:0057.4017 N, 10.8667 WRRS Challenger CH103
387798CTD or STD cast1993-09-06 17:49:0057.403 N, 10.8685 WRRS Challenger CH105
389271CTD or STD cast1994-05-02 23:31:0057.3932 N, 10.8597 WRRS Challenger CH112
390905CTD or STD cast1994-08-18 10:17:0057.4 N, 10.8667 WRRS Challenger CH114
392069CTD or STD cast1994-11-25 17:40:0057.4 N, 10.8667 WRRS Challenger CH116
435170CTD or STD cast1995-04-22 14:06:0057.4 N, 10.8667 WRRS Charles Darwin CD92B
390524CTD or STD cast1995-07-31 15:55:0057.4005 N, 10.868 WRRS Challenger CH120
434129CTD or STD cast1996-01-13 17:57:0057.4 N, 10.8667 WRRS Challenger CH124
1014644CTD or STD cast1996-10-01 18:01:0057.39683 N, 10.86367 WRRS Discovery D223A
1850144Water sample data1996-10-01 18:34:0057.39688 N, 10.86369 WRRS Discovery D223A
1070726CTD or STD cast1999-09-12 20:50:0057.40283 N, 10.84483 WRRS Discovery D242
1252052Water sample data1999-09-12 21:07:0057.40283 N, 10.84483 WRRS Discovery D242
1075221CTD or STD cast2000-02-04 19:11:0057.40133 N, 10.86567 WRRS Discovery D245
559136CTD or STD cast2000-05-18 12:46:0057.3933 N, 10.865 WFRV Scotia 0700S
1230449Water sample data2000-05-18 12:46:0057.39433 N, 10.8665 WFRV Scotia 0700S
676860CTD or STD cast2001-05-21 04:01:0057.4015 N, 10.85167 WRRS Discovery D253
626771CTD or STD cast2003-04-18 12:50:0057.3963 N, 10.8655 WFRV Scotia 0703S
844976CTD or STD cast2003-07-22 15:51:0057.40485 N, 10.87055 WFS Poseidon PO300_2
667137CTD or STD cast2004-07-14 02:48:0057.403 N, 10.86533 WFS Poseidon PO314
896470CTD or STD cast2005-10-11 07:50:0057.4005 N, 10.86404 WRRS Charles Darwin CD176
776596CTD or STD cast2006-10-25 07:54:5657.4025 N, 10.86883 WRRS Discovery D312
847452CTD or STD cast2007-08-29 16:35:1257.39712 N, 10.86659 WRRS Discovery D321B
880848CTD or STD cast2008-05-22 13:05:0057.3735 N, 10.869 WFRV Scotia 0508S
1616866Water sample data2008-05-22 13:05:0057.3735 N, 10.869 WFRV Scotia 0508S
954290CTD or STD cast2009-06-19 18:22:3157.39969 N, 10.87057 WRRS Discovery D340A
1053563CTD or STD cast2010-05-20 01:14:4457.39383 N, 10.8775 WRRS Discovery D351
1929966Currents -subsurface Eulerian2010-05-20 01:15:4457.3961 N, 10.8736 WRRS Discovery D351
1896793Water sample data2010-05-20 01:48:0057.39226 N, 10.87779 WRRS Discovery D351
1195770CTD or STD cast2011-05-30 20:32:1157.39733 N, 10.8725 WRRS Discovery D365
1203520CTD or STD cast2012-08-04 12:23:0057.40017 N, 10.86748 WRRS Discovery D379
1220418CTD or STD cast2013-05-19 19:55:2657.3997 N, 10.8678 WRRS James Cook JC086
1371179CTD or STD cast2014-07-15 12:18:4957.4002 N, 10.8674 WRRS James Clark Ross JR20140531 (JR302)
1723305CTD or STD cast2015-06-13 01:05:5857.3998 N, 10.8672 WRRS Discovery DY031
1879255Water sample data2015-06-13 01:30:0057.39978 N, 10.86725 WRRS Discovery DY031
1764593CTD or STD cast2016-06-16 18:23:3157.3996 N, 10.8667 WRRS Discovery DY052
1765720Currents -subsurface Eulerian2016-06-16 18:24:0057.39955 N, 10.86675 WRRS Discovery DY052
1874921Water sample data2016-06-16 18:48:0057.39955 N, 10.86675 WRRS Discovery DY052