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Metadata Report for BODC Series Reference Number 1722707


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_085
BODC Series Reference 1722707
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 19:24
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.66716 N ( 56° 40.0' N )
Longitude 6.13446 W ( 6° 8.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 225.0 m
Minimum Sensor or Sampling Height -52.0 m
Maximum Sensor or Sampling Height 168.0 m
Sea Floor Depth 173.0 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 = 1722707

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 1G
CategoryOffshore location
Latitude56° 40.02' N
Longitude6° 7.98' W
Water depth below MSL190.0 m

Ellett Line/Extended Ellett Line: Station 1G

Station 1G 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 1G 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. During this period Station 1G was also referred to as Station C1.

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 1G

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
191389CTD or STD cast1981-07-07 04:57:0056.6616 N, 6.135 WRRS Challenger CH10/81
187330CTD or STD cast1981-10-19 22:50:0056.6666 N, 6.1183 WRRS Challenger CH15/81
193280CTD or STD cast1983-05-23 19:08:0056.675 N, 6.1183 WRRS Challenger CH7B/83
96774CTD or STD cast1983-08-15 03:10:0056.6683 N, 6.1166 WRRS Challenger CH11/83
313081CTD or STD cast1984-06-26 14:20:0056.6667 N, 6.1167 WRRS Challenger CH2/84
257808CTD or STD cast1984-11-25 09:31:0056.6666 N, 6.1166 WRRS Challenger CH10/84
258547CTD or STD cast1985-01-28 12:09:0056.6716 N, 6.1166 WRRS Challenger CH1/85
253752CTD or STD cast1985-05-07 17:24:0056.6666 N, 6.115 WRRS Challenger CH4/85
261069CTD or STD cast1985-08-18 23:51:0056.6666 N, 6.12 WRRS Challenger CH8/85
255783CTD or STD cast1985-12-15 16:50:0056.6666 N, 6.1166 WRRS Frederick Russell FR13/85
345882CTD or STD cast1986-06-12 04:21:0056.6667 N, 6.1333 WMV Dawn Sky DSK1/86
346191CTD or STD cast1986-06-14 19:30:0056.6667 N, 6.1333 WMV Dawn Sky DSK1/86
346652CTD or STD cast1986-08-27 21:25:0056.6667 N, 6.1167 WRRS Frederick Russell FR7B/86
348056CTD or STD cast1986-09-27 09:42:0056.6667 N, 6.12 WRRS Frederick Russell FR8/86
264031CTD or STD cast1987-01-08 19:10:0056.6666 N, 6.1166 WRRS Challenger CH9
264043CTD or STD cast1987-01-08 20:32:0056.6666 N, 6.1166 WRRS Challenger CH9
384174CTD or STD cast1987-03-27 11:26:0056.6667 N, 6.1167 WRRS Frederick Russell FR13/87
250698CTD or STD cast1987-05-01 05:34:0056.6666 N, 6.1183 WRRS Challenger CH14
343525CTD or STD cast1987-06-29 00:52:0056.6667 N, 6.1167 WRRS Frederick Russell FR14B/87
256031CTD or STD cast1987-09-01 01:23:0056.6666 N, 6.1333 WRRS Frederick Russell FR18/87
251303CTD or STD cast1987-11-24 15:03:0056.67 N, 6.1383 WRRS Challenger CH22
267053CTD or STD cast1988-03-07 12:57:0056.6666 N, 6.1333 WRRS Challenger CH25
262651CTD or STD cast1988-06-08 08:53:0056.6666 N, 6.1333 WRRS Challenger CH30
265218CTD or STD cast1989-01-22 20:22:0056.6666 N, 6.1333 WRRS Discovery D180
265728CTD or STD cast1989-05-05 12:02:0056.6666 N, 6.1333 WRV Lough Foyle LF1/89
317506CTD or STD cast1989-08-04 14:26:0056.6667 N, 6.1333 WRV Lough Foyle LF2/89
316620CTD or STD cast1989-11-25 02:42:0056.6667 N, 6.1333 WRRS Charles Darwin CD44
314717CTD or STD cast1990-03-12 14:04:0056.6667 N, 6.135 WRRS Challenger CH63_2
315180CTD or STD cast1990-06-29 04:05:0056.6667 N, 6.135 WRRS Challenger CH67A
259968CTD or STD cast1990-09-03 10:04:0056.6666 N, 6.1333 WRRS Challenger CH71A
315942CTD or STD cast1990-12-10 07:26:0056.6667 N, 6.135 WRRS Challenger CH74A_1
382352CTD or STD cast1991-02-24 08:21:0056.6683 N, 6.1383 WRRS Challenger CH75B
316066CTD or STD cast1991-07-01 19:48:0056.6667 N, 6.1483 WRRS Challenger CH81
384229CTD or STD cast1991-11-26 14:36:0056.6633 N, 6.15 WRRS Challenger CH86B
384973CTD or STD cast1992-03-07 19:10:0056.6667 N, 6.1383 WRRS Challenger CH89B
384985CTD or STD cast1992-03-07 19:30:0056.6667 N, 6.1283 WRRS Challenger CH89B
386365CTD or STD cast1992-09-25 20:29:0056.6667 N, 6.135 WRRS Challenger CH97
385269CTD or STD cast1993-03-13 21:06:0056.6667 N, 6.1317 WRRS Challenger CH101B
386064CTD or STD cast1993-05-20 21:18:0056.6667 N, 6.1317 WRRS Challenger CH103
388010CTD or STD cast1993-09-10 08:32:0056.6665 N, 6.1312 WRRS Challenger CH105
388950CTD or STD cast1994-03-14 18:05:0056.6667 N, 6.1333 WRRS Challenger CH110
389627CTD or STD cast1994-05-09 00:51:0056.667 N, 6.1355 WRRS Challenger CH112
390677CTD or STD cast1994-08-15 15:54:0056.6667 N, 6.1333 WRRS Challenger CH114
391841CTD or STD cast1994-11-21 18:52:0056.6667 N, 6.135 WRRS Challenger CH116
434572CTD or STD cast1995-04-14 13:40:0056.6668 N, 6.1255 WRRS Charles Darwin CD92B
390284CTD or STD cast1995-07-29 14:21:0056.667 N, 6.1343 WRRS Challenger CH120
433894CTD or STD cast1996-01-11 12:42:0056.6667 N, 6.1333 WRRS Challenger CH124
1074881CTD or STD cast2000-01-30 16:23:0056.66733 N, 6.146 WRRS Discovery D245
845236CTD or STD cast2003-07-25 15:34:0056.6697 N, 6.13537 WFS Poseidon PO300_2
666933CTD or STD cast2004-07-12 10:14:0056.6655 N, 6.14933 WFS Poseidon PO314
897067CTD or STD cast2005-10-26 09:29:0056.6671 N, 6.1343 WRRS Charles Darwin CD176
776965CTD or STD cast2006-10-30 06:40:0256.6665 N, 6.135 WRRS Discovery D312
847661CTD or STD cast2007-08-31 14:30:4456.66684 N, 6.13216 WRRS Discovery D321B
954831CTD or STD cast2009-06-25 05:34:4156.6672 N, 6.13373 WRRS Discovery D340A
1053004CTD or STD cast2010-05-21 19:29:2956.66833 N, 6.13583 WRRS Discovery D351
1897053Water sample data2010-05-21 19:39:0056.6685 N, 6.13575 WRRS Discovery D351
1195260CTD or STD cast2011-05-20 02:00:5856.66617 N, 6.14283 WRRS Discovery D365
1203206CTD or STD cast2012-08-02 08:19:0056.66856 N, 6.13348 WRRS Discovery D379
1220596CTD or STD cast2013-05-23 06:19:5856.6667 N, 6.1333 WRRS James Cook JC086
1371444CTD or STD cast2014-07-17 15:11:1856.6667 N, 6.133 WRRS James Clark Ross JR20140531 (JR302)
1723631CTD or STD cast2015-06-15 19:24:0756.6671 N, 6.1344 WRRS Discovery DY031
1879532Water sample data2015-06-15 19:43:0056.66715 N, 6.13439 WRRS Discovery DY031
1764882CTD or STD cast2016-06-20 08:39:4656.667 N, 6.1329 WRRS Discovery DY052
1766016Currents -subsurface Eulerian2016-06-20 08:40:1156.66698 N, 6.13286 WRRS Discovery DY052
1875186Water sample data2016-06-20 08:50:0056.66697 N, 6.13285 WRRS Discovery DY052