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Metadata Report for BODC Series Reference Number 1722455


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_061
BODC Series Reference 1722455
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 00:54
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 57.09978 N ( 57° 6.0' N )
Longitude 9.41734 W ( 9° 25.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 1405.0 m
Minimum Sensor or Sampling Height 3.0 m
Maximum Sensor or Sampling Height 1403.0 m
Sea Floor Depth 1408.0 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 = 1722455

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 P
CategoryOffshore location
Latitude57° 6.00' N
Longitude9° 25.02' W
Water depth below MSL1050.0 m

Ellett Line/Extended Ellett Line: Station P

Station P 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 P 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 P

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
89913CTD or STD cast1975-05-04 01:06:0057.1 N, 9.4166 WRRS Challenger CH7A/75
89243CTD or STD cast1975-07-05 05:00:0057.105 N, 9.425 WRRS Challenger CH10A/75
89697CTD or STD cast1975-08-31 17:00:0057.1 N, 9.4233 WRRS Challenger CH12A/75
90127CTD or STD cast1975-11-08 14:55:0057.1 N, 9.4216 WRRS Challenger CH14A/75
90385CTD or STD cast1975-11-11 07:21:0057.1016 N, 9.415 WRRS Challenger CH14A/75
91167CTD or STD cast1976-05-21 04:55:0057.0983 N, 9.4333 WRRS Challenger CH8/76
94257CTD or STD cast1977-07-24 18:30:0057.1083 N, 9.4283 WRRS Challenger CH11/77
88701CTD or STD cast1977-08-21 17:34:0057.0916 N, 9.4116 WRRS Challenger CH13/77
92299CTD or STD cast1978-02-03 05:37:0057.0883 N, 9.4183 WRRS Challenger CH2/78
92552CTD or STD cast1978-02-07 14:34:0057.095 N, 9.3833 WRRS Challenger CH2/78
94859CTD or STD cast1978-04-19 21:37:0057.0966 N, 9.41 WRRS Challenger CH6/78
95328CTD or STD cast1978-06-06 13:40:0057.0983 N, 9.4133 WRRS Challenger CH9/78
186117CTD or STD cast1978-08-10 18:09:0057.0966 N, 9.41 WRRS Challenger CH11B/78
314453CTD or STD cast1978-11-08 12:00:0057.1 N, 9.405 WRRS Challenger CH14B/78
98720CTD or STD cast1979-05-21 14:22:0057.1 N, 9.4166 WRRS Challenger CH7/79
95918CTD or STD cast1979-09-14 06:22:0057.0866 N, 9.3866 WRRS Challenger CH13/79
96111CTD or STD cast1979-10-29 22:34:0057.115 N, 9.4133 WRRS Challenger CH16/79
187692CTD or STD cast1980-03-03 20:54:0057.095 N, 9.4183 WRRS Challenger CH4/80
312680CTD or STD cast1981-01-30 00:42:0057.1 N, 9.417 WRRS Challenger CH2/81
187876CTD or STD cast1981-04-13 03:54:0057.1 N, 9.4166 WRRS Challenger CH6A/81
188413CTD or STD cast1981-04-21 00:21:0057.1016 N, 9.4183 WRRS Challenger CH6B/81
192227CTD or STD cast1981-07-12 16:00:0057.1 N, 9.4066 WRRS Challenger CH10/81
187213CTD or STD cast1981-10-17 15:05:0057.0983 N, 9.4166 WRRS Challenger CH15/81
189176CTD or STD cast1982-04-27 19:12:0057.12 N, 9.42 WRRS Challenger CH7A/82
193476CTD or STD cast1983-05-24 20:01:0057.1016 N, 9.415 WRRS Challenger CH7B/83
97058CTD or STD cast1983-08-19 01:57:0057.1 N, 9.4166 WRRS Challenger CH11/83
313241CTD or STD cast1984-06-27 22:16:0057.1017 N, 9.4167 WRRS Challenger CH2/84
258351CTD or STD cast1985-01-26 15:52:0057.1 N, 9.415 WRRS Challenger CH1/85
253912CTD or STD cast1985-05-08 19:00:0057.1016 N, 9.4166 WRRS Challenger CH4/85
261217CTD or STD cast1985-08-20 08:05:0057.105 N, 9.415 WRRS Challenger CH8/85
264196CTD or STD cast1987-01-10 12:49:0057.1 N, 9.4166 WRRS Challenger CH9
250557CTD or STD cast1987-04-30 06:12:0057.1083 N, 9.4116 WRRS Challenger CH14
266897CTD or STD cast1988-03-06 07:50:0057.1 N, 9.415 WRRS Challenger CH25
263943CTD or STD cast1988-06-20 08:50:0057.1 N, 9.415 WRRS Challenger CH30
265384CTD or STD cast1989-01-24 17:47:0057.1 N, 9.4166 WRRS Discovery D180
265882CTD or STD cast1989-05-06 07:06:0057.1 N, 9.4166 WRV Lough Foyle LF1/89
317660CTD or STD cast1989-08-05 11:00:0057.1 N, 9.4167 WRV Lough Foyle LF2/89
316841CTD or STD cast1989-11-26 03:28:0057.1 N, 9.4133 WRRS Charles Darwin CD44
315063CTD or STD cast1990-06-28 05:06:0057.1 N, 9.4167 WRRS Challenger CH67A
259815CTD or STD cast1990-09-02 12:29:0057.1 N, 9.4166 WRRS Challenger CH71A
382524CTD or STD cast1991-02-26 21:44:0057.1 N, 9.4167 WRRS Challenger CH75B
316226CTD or STD cast1991-07-02 18:02:0057.1 N, 9.415 WRRS Challenger CH81
386513CTD or STD cast1992-09-26 23:04:0057.1 N, 9.4167 WRRS Challenger CH97
385718CTD or STD cast1993-05-17 01:52:0057.0967 N, 9.4133 WRRS Challenger CH103
385811CTD or STD cast1993-05-17 20:18:0057.0983 N, 9.4167 WRRS Challenger CH103
387854CTD or STD cast1993-09-08 07:00:0057.1017 N, 9.4183 WRRS Challenger CH105
389098CTD or STD cast1994-03-18 03:02:0057.1 N, 9.4167 WRRS Challenger CH110
389326CTD or STD cast1994-05-03 20:40:0057.1 N, 9.4167 WRRS Challenger CH112
389455CTD or STD cast1994-05-07 23:00:0057.1 N, 9.4167 WRRS Challenger CH112
390849CTD or STD cast1994-08-16 21:19:0057.1 N, 9.4167 WRRS Challenger CH114
391994CTD or STD cast1994-11-24 18:22:0057.1 N, 9.4167 WRRS Challenger CH116
434744CTD or STD cast1995-04-15 19:12:0057.1 N, 9.4167 WRRS Charles Darwin CD92B
435409CTD or STD cast1995-04-30 08:28:0057.1 N, 9.4167 WRRS Charles Darwin CD92B
390456CTD or STD cast1995-07-30 14:53:0057.1005 N, 9.4167 WRRS Challenger CH120
434062CTD or STD cast1996-01-12 23:14:0057.1 N, 9.4167 WRRS Challenger CH124
1014588CTD or STD cast1996-10-01 01:02:0057.122 N, 9.4455 WRRS Discovery D223A
1850088Water sample data1996-10-01 02:08:0057.12204 N, 9.44549 WRRS Discovery D223A
1008061CTD or STD cast1997-09-14 07:21:0057.096 N, 9.411 WRRS Discovery D230
1305030Water sample data1997-09-14 08:16:0057.09605 N, 9.41102 WRRS Discovery D230
1077092CTD or STD cast1999-06-04 11:59:0057.09367 N, 9.41067 WNot applicable
1070658CTD or STD cast1999-09-11 22:24:0057.111 N, 9.45417 WRRS Discovery D242
1251988Water sample data1999-09-11 22:51:0057.111 N, 9.45417 WRRS Discovery D242
1075153CTD or STD cast2000-02-03 14:49:0057.1095 N, 9.4275 WRRS Discovery D245
559197CTD or STD cast2000-05-19 01:37:0057.0983 N, 9.4217 WFRV Scotia 0700S
1230462Water sample data2000-05-19 01:37:0057.09867 N, 9.4225 WFRV Scotia 0700S
676811CTD or STD cast2001-05-20 10:43:0057.0985 N, 9.421 WRRS Discovery D253
626710CTD or STD cast2003-04-18 00:36:0057.1018 N, 9.4147 WFRV Scotia 0703S
845040CTD or STD cast2003-07-24 10:25:0057.10048 N, 9.41977 WFS Poseidon PO300_2
667082CTD or STD cast2004-07-13 09:59:0057.1 N, 9.42333 WFS Poseidon PO314
896421CTD or STD cast2005-10-08 08:09:0057.10036 N, 9.41444 WRRS Charles Darwin CD176
776640CTD or STD cast2006-10-26 02:49:2457.0985 N, 9.42017 WRRS Discovery D312
847488CTD or STD cast2007-08-30 10:03:3257.09809 N, 9.4162 WRRS Discovery D321B
880904CTD or STD cast2008-05-23 05:41:0057.10183 N, 9.41683 WFRV Scotia 0508S
1616922Water sample data2008-05-23 05:41:0057.10183 N, 9.41683 WFRV Scotia 0508S
954357CTD or STD cast2009-06-20 11:39:3857.10212 N, 9.42846 WRRS Discovery D340A
1052800CTD or STD cast2010-05-20 17:33:2757.09883 N, 9.40567 WRRS Discovery D351
1930015Currents -subsurface Eulerian2010-05-20 17:34:2757.0998 N, 9.4151 WRRS Discovery D351
1896848Water sample data2010-05-20 18:20:0057.09849 N, 9.40335 WRRS Discovery D351
1195825CTD or STD cast2011-05-31 11:40:0957.10033 N, 9.41867 WRRS Discovery D365
1203464CTD or STD cast2012-08-03 17:46:0057.10052 N, 9.42351 WRRS Discovery D379
1220479CTD or STD cast2013-05-20 13:37:0457.102 N, 9.4176 WRRS James Cook JC086
1371235CTD or STD cast2014-07-16 02:23:0557.1001 N, 9.4171 WRRS James Clark Ross JR20140531 (JR302)
1723354CTD or STD cast2015-06-14 00:53:4757.0998 N, 9.4173 WRRS Discovery DY031
1879311Water sample data2015-06-14 01:22:0057.09984 N, 9.41752 WRRS Discovery DY031
1764636CTD or STD cast2016-06-17 23:22:4457.0998 N, 9.4175 WRRS Discovery DY052
1765768Currents -subsurface Eulerian2016-06-17 23:22:5557.0998 N, 9.41755 WRRS Discovery DY052
1874969Water sample data2016-06-17 23:59:0057.0998 N, 9.41755 WRRS Discovery DY052