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Metadata Report for BODC Series Reference Number 1722603


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_075
BODC Series Reference 1722603
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 00:42
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.73330 N ( 56° 44.0' N )
Longitude 7.66708 W ( 7° 40.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 175.0 m
Minimum Sensor or Sampling Height 21.0 m
Maximum Sensor or Sampling Height 191.0 m
Sea Floor Depth 196.0 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 = 1722603

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 Quality Report

All casts were processed, although it was noted that casts shallower than 100-200 m often seemed to have problems, usually characterised as giving a profile that was significantly deeper than the true water depth. It is assumed this was due to confusing reflections at the seabed, and recommend that those profiles not be used (Casts 35, 37, 46, 47, 68-75, 79-81, 83). For more information see the cruise report page 35.


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 11G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 40.02' W
Water depth below MSL55.0 m

Ellett Line/Extended Ellett Line: Station 11G

Station 11G 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 11G 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 11G was also referred to as Station C7.

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 11G

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
90570CTD or STD cast1976-04-04 12:04:0056.7333 N, 7.6633 WRRS Challenger CH5A/76
91745CTD or STD cast1976-05-28 16:50:0056.7333 N, 7.66 WRRS Challenger CH8/76
91063CTD or STD cast1977-03-08 01:50:0056.7333 N, 7.6666 WRRS Challenger CH4/77
91917CTD or STD cast1977-04-14 19:10:0056.7333 N, 7.6666 WRRS Challenger CH6B/77
94325CTD or STD cast1977-07-25 09:53:0056.7366 N, 7.6616 WRRS Challenger CH11/77
89199CTD or STD cast1977-09-01 01:44:0056.7316 N, 7.66 WRRS Challenger CH13/77
92214CTD or STD cast1978-02-02 18:55:0056.7283 N, 7.6616 WRRS Challenger CH2/78
94602CTD or STD cast1978-04-17 22:18:0056.7416 N, 7.675 WRRS Challenger CH6/78
186178CTD or STD cast1978-08-11 04:53:0056.7333 N, 7.6666 WRRS Challenger CH11B/78
314336CTD or STD cast1978-11-05 01:25:0056.7333 N, 7.6667 WRRS Challenger CH14B/78
98800CTD or STD cast1979-05-22 01:00:0056.7316 N, 7.6683 WRRS Challenger CH7/79
95838CTD or STD cast1979-09-13 16:40:0056.7283 N, 7.6666 WRRS Challenger CH13/79
96031CTD or STD cast1979-10-29 11:16:0056.735 N, 7.6633 WRRS Challenger CH16/79
187784CTD or STD cast1980-03-04 17:15:0056.735 N, 7.665 WRRS Challenger CH4/80
189662CTD or STD cast1980-06-01 08:08:0056.7316 N, 7.6883 WRRS Challenger CH9B/80
186904CTD or STD cast1980-10-02 17:06:0056.73 N, 7.6666 WRRS Challenger CH15/80
187968CTD or STD cast1981-04-13 23:09:0056.73 N, 7.6666 WRRS Challenger CH6A/81
191494CTD or STD cast1981-07-07 16:43:0056.7216 N, 7.66 WRRS Challenger CH10/81
189103CTD or STD cast1982-04-26 18:57:0056.7183 N, 7.6966 WRRS Challenger CH7A/82
193384CTD or STD cast1983-05-24 07:22:0056.735 N, 7.6683 WRRS Challenger CH7B/83
96817CTD or STD cast1983-08-16 00:12:0056.73 N, 7.6716 WRRS Challenger CH11/83
313148CTD or STD cast1984-06-27 05:26:0056.73 N, 7.6633 WRRS Challenger CH2/84
257962CTD or STD cast1984-12-02 17:35:0056.735 N, 7.67 WRRS Challenger CH10/84
258418CTD or STD cast1985-01-27 04:54:0056.725 N, 7.6683 WRRS Challenger CH1/85
253832CTD or STD cast1985-05-08 07:37:0056.7316 N, 7.6666 WRRS Challenger CH4/85
261137CTD or STD cast1985-08-19 18:42:0056.73 N, 7.665 WRRS Challenger CH8/85
255838CTD or STD cast1985-12-16 17:13:0056.7333 N, 7.6666 WRRS Frederick Russell FR13/85
346086CTD or STD cast1986-06-14 02:13:0056.7333 N, 7.6667 WMV Dawn Sky DSK1/86
347932CTD or STD cast1986-09-26 04:51:0056.7333 N, 7.6667 WRRS Frederick Russell FR8/86
264123CTD or STD cast1987-01-09 23:20:0056.7333 N, 7.6666 WRRS Challenger CH9
250625CTD or STD cast1987-04-30 18:18:0056.7233 N, 7.6616 WRRS Challenger CH14
255955CTD or STD cast1987-08-31 17:04:0056.7333 N, 7.65 WRRS Frederick Russell FR18/87
251677CTD or STD cast1987-11-28 02:07:0056.73 N, 7.665 WRRS Challenger CH22
266977CTD or STD cast1988-03-06 20:52:0056.7316 N, 7.665 WRRS Challenger CH25
262731CTD or STD cast1988-06-08 23:19:0056.7333 N, 7.6666 WRRS Challenger CH30
264018CTD or STD cast1988-06-20 19:51:0056.7333 N, 7.6683 WRRS Challenger CH30
265292CTD or STD cast1989-01-24 04:53:0056.7333 N, 7.6666 WRRS Discovery D180
265808CTD or STD cast1989-05-05 21:18:0056.7333 N, 7.6666 WRV Lough Foyle LF1/89
317580CTD or STD cast1989-08-05 01:22:0056.7333 N, 7.6667 WRV Lough Foyle LF2/89
316736CTD or STD cast1989-11-25 15:57:0056.7333 N, 7.6667 WRRS Charles Darwin CD44
315118CTD or STD cast1990-06-28 14:43:0056.73 N, 7.6717 WRRS Challenger CH67A
259888CTD or STD cast1990-09-03 00:08:0056.7333 N, 7.6666 WRRS Challenger CH71A
315874CTD or STD cast1990-12-09 21:38:0056.7333 N, 7.665 WRRS Challenger CH74A_1
382444CTD or STD cast1991-02-24 23:59:0056.7333 N, 7.6667 WRRS Challenger CH75B
316146CTD or STD cast1991-07-02 06:10:0056.7367 N, 7.6667 WRRS Challenger CH81
384309CTD or STD cast1991-11-27 01:23:0056.735 N, 7.6683 WRRS Challenger CH86B
385061CTD or STD cast1992-03-08 16:27:0056.735 N, 7.6683 WRRS Challenger CH89B
386445CTD or STD cast1992-09-26 08:47:0056.7333 N, 7.6667 WRRS Challenger CH97
385325CTD or STD cast1993-03-14 18:44:0056.73 N, 7.6667 WRRS Challenger CH101B
385988CTD or STD cast1993-05-20 11:46:0056.7317 N, 7.6667 WRRS Challenger CH103
387934CTD or STD cast1993-09-09 20:43:0056.7333 N, 7.6668 WRRS Challenger CH105
388022CTD or STD cast1993-09-10 16:58:0056.7333 N, 7.6683 WRRS Challenger CH105
389025CTD or STD cast1994-03-15 04:49:0056.7333 N, 7.6667 WRRS Challenger CH110
389559CTD or STD cast1994-05-08 14:49:0056.7473 N, 7.6583 WRRS Challenger CH112
390026CTD or STD cast1994-05-12 05:55:0056.7333 N, 7.6667 WRRS Challenger CH112
390757CTD or STD cast1994-08-16 08:13:0056.7333 N, 7.6667 WRRS Challenger CH114
391921CTD or STD cast1994-11-24 08:14:0056.7333 N, 7.6667 WRRS Challenger CH116
434640CTD or STD cast1995-04-15 01:54:0056.7333 N, 7.6667 WRRS Charles Darwin CD92B
435599CTD or STD cast1995-05-01 11:32:0056.7333 N, 7.6667 WRRS Charles Darwin CD92B
390352CTD or STD cast1995-07-30 00:18:0056.7393 N, 7.6803 WRRS Challenger CH120
433974CTD or STD cast1996-01-12 05:42:0056.7333 N, 7.6667 WRRS Challenger CH124
1289267Water sample data1996-01-12 05:42:0056.7333 N, 7.6667 WRRS Challenger CH124
1077147CTD or STD cast1999-06-04 23:36:0056.7325 N, 7.68183 WNot applicable
1075048CTD or STD cast2000-02-01 23:43:0056.73317 N, 7.66083 WRRS Discovery D245
845144CTD or STD cast2003-07-25 04:23:0056.73383 N, 7.66618 WFS Poseidon PO300_2
845156CTD or STD cast2003-07-25 04:56:0056.73533 N, 7.66185 WFS Poseidon PO300_2
667021CTD or STD cast2004-07-12 20:07:0056.73383 N, 7.67067 WFS Poseidon PO314
896906CTD or STD cast2005-10-25 16:06:0056.73457 N, 7.67284 WRRS Charles Darwin CD176
776744CTD or STD cast2006-10-27 01:07:5056.73083 N, 7.50633 WRRS Discovery D312
776756CTD or STD cast2006-10-27 02:33:4056.739 N, 7.6725 WRRS Discovery D312
881004CTD or STD cast2008-05-23 17:09:0056.73333 N, 7.66583 WFRV Scotia 0508S
1617022Water sample data2008-05-23 17:09:0056.73333 N, 7.66583 WFRV Scotia 0508S
954714CTD or STD cast2009-06-24 17:56:2456.73178 N, 7.66205 WRRS Discovery D340A
1052897CTD or STD cast2010-05-21 07:23:4756.73367 N, 7.66967 WRRS Discovery D351
1896941Water sample data2010-05-21 07:31:0056.73339 N, 7.66964 WRRS Discovery D351
1203323CTD or STD cast2012-08-02 23:04:0056.73524 N, 7.67592 WRRS Discovery D379
1371339CTD or STD cast2014-07-16 21:38:4056.7323 N, 7.6675 WRRS James Clark Ross JR20140531 (JR302)
1723514CTD or STD cast2015-06-15 00:40:1756.7333 N, 7.6671 WRRS Discovery DY031
1879427Water sample data2015-06-15 00:44:0056.7333 N, 7.66708 WRRS Discovery DY031
1764777CTD or STD cast2016-06-19 13:51:1656.7336 N, 7.6689 WRRS Discovery DY052
1765904Currents -subsurface Eulerian2016-06-19 13:51:4756.73364 N, 7.6689 WRRS Discovery DY052
1875082Water sample data2016-06-19 13:56:0056.73364 N, 7.66891 WRRS Discovery DY052