Metadata Report for BODC Series Reference Number 1721901
No Problem Report Found in the Database
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."
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.
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
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.
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.
Thurnherr, A. M., 2014. How To Process LADCP Data With the LDEO Software, Versions IX.7 - IX.10.
No Project Information held for the Series
|Principal Scientist(s)||N Penny Holliday (National Oceanography Centre, Southampton)|
Complete Cruise Metadata Report is available here
Fixed Station Information
|Station Name||Extended Ellett Line Station IB16|
|Latitude||61° 30.00' N|
|Longitude||20° 0.00' W|
|Water depth below MSL||2000.0 m|
Extended Ellett Line: Fixed Station IB16
Station IB16 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.
Related Fixed Station activities are detailed in Appendix 1
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||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.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|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|
|O||Improbable value - user quality control|
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|
|Q||value below limit of quantification|
Appendix 1: Extended Ellett Line Station IB16
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 Identifier||Data Category||Start date/time||Start position||Cruise|
|1008325||CTD or STD cast||1997-09-10 06:27:00||61.64983 N, 20.02383 W||RRS Discovery D230|
|1304801||Water sample data||1997-09-10 07:33:00||61.64985 N, 20.02385 W||RRS Discovery D230|
|1020453||CTD or STD cast||1998-05-23 10:34:00||61.496 N, 20.003 W||RRS Discovery D233|
|1306113||Water sample data||1998-05-23 11:35:00||61.49608 N, 20.00305 W||RRS Discovery D233|
|1849260||Water sample data||1998-05-23 11:35:00||61.49608 N, 20.00305 W||RRS Discovery D233|
|1070984||CTD or STD cast||1999-09-17 02:17:00||61.64417 N, 19.99683 W||RRS Discovery D242|
|1252353||Water sample data||1999-09-17 02:52:00||61.64417 N, 19.99683 W||RRS Discovery D242|
|670618||CTD or STD cast||2001-05-10 16:02:00||61.49733 N, 20.00517 W||RRS Discovery D253|
|667426||CTD or STD cast||2004-07-18 03:58:00||61.50167 N, 19.9995 W||FS Poseidon PO314|
|897079||CTD or STD cast||2005-10-19 13:57:00||61.49984 N, 19.99988 W||RRS Charles Darwin CD176|
|776326||CTD or STD cast||2006-10-13 21:28:05||61.50667 N, 19.99067 W||RRS Discovery D312|
|847845||CTD or STD cast||2007-08-26 22:17:35||61.50071 N, 20.0013 W||RRS Discovery D321B|
|953981||CTD or STD cast||2009-06-12 00:55:31||61.4991 N, 20.00053 W||RRS Discovery D340A|
|1052535||CTD or STD cast||2010-05-14 02:04:44||61.49983 N, 20.01583 W||RRS Discovery D351|
|1929677||Currents -subsurface Eulerian||2010-05-14 02:05:55||61.4989 N, 19.9998 W||RRS Discovery D351|
|1896467||Water sample data||2010-05-14 03:08:00||61.4996 N, 20.01846 W||RRS Discovery D351|
|1195456||CTD or STD cast||2011-05-25 18:17:58||61.50033 N, 19.999 W||RRS Discovery D365|
|1204271||CTD or STD cast||2012-08-13 23:20:00||61.4997 N, 20.00126 W||RRS Discovery D379|
|1220117||CTD or STD cast||2013-05-11 10:34:31||61.4976 N, 20.0062 W||RRS James Cook JC086|
|1371014||CTD or STD cast||2014-07-12 18:28:59||61.4997 N, 19.9997 W||RRS James Clark Ross JR20140531 (JR302)|
|1722800||CTD or STD cast||2015-06-04 04:20:03||61.5005 N, 19.9999 W||RRS Discovery DY031|
|1878774||Water sample data||2015-06-04 05:26:00||61.50048 N, 19.99988 W||RRS Discovery DY031|
|1764199||CTD or STD cast||2016-06-11 21:34:11||61.5009 N, 20.0014 W||RRS Discovery DY052|
|1765326||Currents -subsurface Eulerian||2016-06-11 21:34:37||61.50088 N, 20.00147 W||RRS Discovery DY052|
|1874527||Water sample data||2016-06-11 22:32:00||61.50089 N, 20.00147 W||RRS Discovery DY052|