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Metadata Report for BODC Series Reference Number 1722615


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_076
BODC Series Reference 1722615
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 02:44
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.73316 N ( 56° 44.0' N )
Longitude 7.49990 W ( 7° 30.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 200.0 m
Minimum Sensor or Sampling Height 18.0 m
Maximum Sensor or Sampling Height 213.0 m
Sea Floor Depth 218.0 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 = 1722615

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 10G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 30.00' W
Water depth below MSL220.0 m

Ellett Line/Extended Ellett Line: Station 10G

Station 10G 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 10G 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 10G

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
193372CTD or STD cast1983-05-24 06:09:0056.7333 N, 7.5 WRRS Challenger CH7B/83
96805CTD or STD cast1983-08-15 22:54:0056.7333 N, 7.5033 WRRS Challenger CH11/83
253820CTD or STD cast1985-05-08 06:32:0056.7333 N, 7.5 WRRS Challenger CH4/85
261125CTD or STD cast1985-08-19 17:26:0056.7333 N, 7.495 WRRS Challenger CH8/85
255899CTD or STD cast1985-12-17 08:00:0056.7333 N, 7.5 WRRS Frederick Russell FR13/85
346098CTD or STD cast1986-06-14 04:09:0056.7333 N, 7.5 WMV Dawn Sky DSK1/86
347944CTD or STD cast1986-09-26 06:24:0056.7333 N, 7.5 WRRS Frederick Russell FR8/86
264111CTD or STD cast1987-01-09 22:18:0056.7333 N, 7.5 WRRS Challenger CH9
250637CTD or STD cast1987-04-30 19:09:0056.7366 N, 7.5 WRRS Challenger CH14
255967CTD or STD cast1987-08-31 17:57:0056.735 N, 7.4833 WRRS Frederick Russell FR18/87
251689CTD or STD cast1987-11-28 03:02:0056.7316 N, 7.5016 WRRS Challenger CH22
266989CTD or STD cast1988-03-06 21:52:0056.735 N, 7.505 WRRS Challenger CH25
262718CTD or STD cast1988-06-08 22:20:0056.7333 N, 7.5016 WRRS Challenger CH30
265280CTD or STD cast1989-01-24 03:28:0056.7333 N, 7.5 WRRS Discovery D180
265790CTD or STD cast1989-05-05 20:26:0056.7333 N, 7.5 WRV Lough Foyle LF1/89
317579CTD or STD cast1989-08-05 00:36:0056.7333 N, 7.5017 WRV Lough Foyle LF2/89
316724CTD or STD cast1989-11-25 14:47:0056.73 N, 7.5 WRRS Charles Darwin CD44
259907CTD or STD cast1990-09-03 00:58:0056.7333 N, 7.5 WRRS Challenger CH71A
315886CTD or STD cast1990-12-09 22:38:0056.7333 N, 7.5 WRRS Challenger CH74A_1
382432CTD or STD cast1991-02-24 22:48:0056.7333 N, 7.5 WRRS Challenger CH75B
316134CTD or STD cast1991-07-02 05:12:0056.7333 N, 7.4983 WRRS Challenger CH81
384291CTD or STD cast1991-11-27 00:07:0056.73 N, 7.5 WRRS Challenger CH86B
385048CTD or STD cast1992-03-08 15:22:0056.7317 N, 7.5 WRRS Challenger CH89B
386433CTD or STD cast1992-09-26 07:52:0056.7317 N, 7.5 WRRS Challenger CH97
386003CTD or STD cast1993-05-20 13:07:0056.73 N, 7.4967 WRRS Challenger CH103
387946CTD or STD cast1993-09-09 22:14:0056.738 N, 7.5025 WRRS Challenger CH105
389013CTD or STD cast1994-03-15 03:17:0056.7335 N, 7.4922 WRRS Challenger CH110
389560CTD or STD cast1994-05-08 15:52:0056.7333 N, 7.5 WRRS Challenger CH112
390745CTD or STD cast1994-08-16 05:20:0056.726 N, 7.5008 WRRS Challenger CH114
391908CTD or STD cast1994-11-22 16:29:0056.7333 N, 7.5 WRRS Challenger CH116
434639CTD or STD cast1995-04-15 00:04:0056.7333 N, 7.5 WRRS Charles Darwin CD92B
435606CTD or STD cast1995-05-01 12:48:0056.7333 N, 7.5 WRRS Charles Darwin CD92B
390340CTD or STD cast1995-07-29 22:33:0056.733 N, 7.5012 WRRS Challenger CH120
433950CTD or STD cast1996-01-12 01:41:0056.7333 N, 7.5 WRRS Challenger CH124
433962CTD or STD cast1996-01-12 03:55:0056.7333 N, 7.5 WRRS Challenger CH124
1289255Water sample data1996-01-12 03:55:0056.7333 N, 7.5 WRRS Challenger CH124
1077159CTD or STD cast1999-06-05 01:01:0056.7285 N, 7.51 WNot applicable
1075036CTD or STD cast2000-02-01 21:48:0056.7325 N, 7.50433 WRRS Discovery D245
845168CTD or STD cast2003-07-25 06:05:0056.73388 N, 7.49955 WFS Poseidon PO300_2
667008CTD or STD cast2004-07-12 18:58:0056.732 N, 7.50483 WFS Poseidon PO314
881016CTD or STD cast2008-05-23 17:59:0056.73317 N, 7.49817 WFRV Scotia 0508S
1617034Water sample data2008-05-23 17:59:0056.73317 N, 7.49817 WFRV Scotia 0508S
954726CTD or STD cast2009-06-24 18:58:5256.73411 N, 7.50387 WRRS Discovery D340A
1052904CTD or STD cast2010-05-21 08:35:0156.72917 N, 7.49933 WRRS Discovery D351
1930088Currents -subsurface Eulerian2010-05-21 08:35:5056.7308 N, 7.5001 WRRS Discovery D351
1896953Water sample data2010-05-21 08:53:0056.72855 N, 7.49881 WRRS Discovery D351
1195352CTD or STD cast2011-05-20 14:15:0056.72917 N, 7.50233 WRRS Discovery D365
1203311CTD or STD cast2012-08-02 21:27:0056.72886 N, 7.5081 WRRS Discovery D379
1220676CTD or STD cast2013-05-24 04:02:1556.7333 N, 7.5 WRRS James Cook JC086
1371340CTD or STD cast2014-07-16 23:28:0056.733 N, 7.4994 WRRS James Clark Ross JR20140531 (JR302)
1723526CTD or STD cast2015-06-15 02:44:0456.7332 N, 7.4999 WRRS Discovery DY031
1879439Water sample data2015-06-15 02:55:0056.73316 N, 7.4999 WRRS Discovery DY031
1764789CTD or STD cast2016-06-19 15:01:3356.7345 N, 7.4992 WRRS Discovery DY052
1765916Currents -subsurface Eulerian2016-06-19 15:01:4656.73453 N, 7.4992 WRRS Discovery DY052
1875094Water sample data2016-06-19 15:13:0056.73453 N, 7.4992 WRRS Discovery DY052