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Metadata Report for BODC Series Reference Number 1722652


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_080
BODC Series Reference 1722652
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 11:33
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.73350 N ( 56° 44.0' N )
Longitude 6.75078 W ( 6° 45.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 65.0 m
Minimum Sensor or Sampling Height 15.0 m
Maximum Sensor or Sampling Height 75.0 m
Sea Floor Depth 80.0 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 = 1722652

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 6G
CategoryOffshore location
Latitude56° 43.98' N
Longitude6° 45.00' W
Water depth below MSL35.0 m

Ellett Line/Extended Ellett Line: Station 6G

Station 6G 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 6G 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 6G was also referred to as Station C4.

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 6G

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
90601CTD or STD cast1976-04-04 16:28:0056.7333 N, 6.7466 WRRS Challenger CH5A/76
91099CTD or STD cast1977-03-08 06:26:0056.74 N, 6.7633 WRRS Challenger CH4/77
91886CTD or STD cast1977-04-14 14:40:0056.7333 N, 6.7516 WRRS Challenger CH6B/77
94350CTD or STD cast1977-07-25 14:47:0056.73 N, 6.7466 WRRS Challenger CH11/77
92183CTD or STD cast1978-02-02 14:17:0056.7316 N, 6.7416 WRRS Challenger CH2/78
94976CTD or STD cast1978-04-20 19:08:0056.7283 N, 6.735 WRRS Challenger CH6/78
95746CTD or STD cast1978-06-09 18:18:0056.7266 N, 6.7833 WRRS Challenger CH9/78
186210CTD or STD cast1978-08-11 09:59:0056.7333 N, 6.75 WRRS Challenger CH11B/78
190915CTD or STD cast1978-09-14 12:28:0056.7316 N, 6.7466 WRRS Challenger CH11D/78
314300CTD or STD cast1978-11-04 19:25:0056.7333 N, 6.7483 WRRS Challenger CH14B/78
98836CTD or STD cast1979-05-22 05:46:0056.735 N, 6.75 WRRS Challenger CH7/79
95802CTD or STD cast1979-09-13 11:00:0056.7316 N, 6.7533 WRRS Challenger CH13/79
95992CTD or STD cast1979-10-29 06:18:0056.7366 N, 6.7533 WRRS Challenger CH16/79
187815CTD or STD cast1980-03-04 21:33:0056.7316 N, 6.7466 WRRS Challenger CH4/80
189637CTD or STD cast1980-06-01 02:41:0056.7266 N, 6.7666 WRRS Challenger CH9B/80
186873CTD or STD cast1980-10-02 11:58:0056.7333 N, 6.7216 WRRS Challenger CH15/80
312526CTD or STD cast1981-01-27 18:45:0056.7333 N, 6.7167 WRRS Challenger CH2/81
188007CTD or STD cast1981-04-14 03:29:0056.73 N, 6.75 WRRS Challenger CH6A/81
191445CTD or STD cast1981-07-07 09:19:0056.7316 N, 6.7533 WRRS Challenger CH10/81
187305CTD or STD cast1981-10-19 19:19:0056.7316 N, 6.74 WRRS Challenger CH15/81
312760CTD or STD cast1982-01-27 18:44:0056.735 N, 6.7483 WRRS Challenger CH2/82
189072CTD or STD cast1982-04-26 12:38:0056.735 N, 6.7316 WRRS Challenger CH7A/82
193335CTD or STD cast1983-05-24 00:46:0056.735 N, 6.75 WRRS Challenger CH7B/83
96725CTD or STD cast1983-08-14 21:25:0056.7333 N, 6.7483 WRRS Challenger CH11/83
313112CTD or STD cast1984-06-26 22:00:0056.7317 N, 6.76 WRRS Challenger CH2/84
257857CTD or STD cast1984-11-25 16:29:0056.735 N, 6.7516 WRRS Challenger CH10/84
258572CTD or STD cast1985-01-28 19:57:0056.7333 N, 6.75 WRRS Challenger CH1/85
253788CTD or STD cast1985-05-08 01:38:0056.7333 N, 6.75 WRRS Challenger CH4/85
261094CTD or STD cast1985-08-19 11:59:0056.7333 N, 6.75 WRRS Challenger CH8/85
255814CTD or STD cast1985-12-15 20:52:0056.7333 N, 6.75 WRRS Frederick Russell FR13/85
346129CTD or STD cast1986-06-14 10:01:0056.7333 N, 6.75 WMV Dawn Sky DSK1/86
346688CTD or STD cast1986-08-28 02:02:0056.7417 N, 6.7467 WRRS Frederick Russell FR7B/86
347993CTD or STD cast1986-09-26 13:20:0056.7333 N, 6.7467 WRRS Frederick Russell FR8/86
264079CTD or STD cast1987-01-09 00:59:0056.7333 N, 6.75 WRRS Challenger CH9
250662CTD or STD cast1987-05-01 00:26:0056.7333 N, 6.75 WRRS Challenger CH14
255992CTD or STD cast1987-08-31 21:45:0056.7333 N, 6.75 WRRS Frederick Russell FR18/87
251339CTD or STD cast1987-11-24 20:32:0056.7333 N, 6.74 WRRS Challenger CH22
267016CTD or STD cast1988-03-07 02:44:0056.735 N, 6.75 WRRS Challenger CH25
262687CTD or STD cast1988-06-08 17:39:0056.7333 N, 6.7483 WRRS Challenger CH30
265255CTD or STD cast1989-01-23 20:43:0056.7333 N, 6.75 WRRS Discovery D180
265765CTD or STD cast1989-05-05 16:33:0056.7333 N, 6.75 WRV Lough Foyle LF1/89
317543CTD or STD cast1989-08-04 20:03:0056.735 N, 6.765 WRV Lough Foyle LF2/89
316681CTD or STD cast1989-11-25 09:17:0056.735 N, 6.7533 WRRS Charles Darwin CD44
314742CTD or STD cast1990-03-13 00:45:0056.735 N, 6.7483 WRRS Challenger CH63_2
315155CTD or STD cast1990-06-28 23:20:0056.7333 N, 6.75 WRRS Challenger CH67A
259932CTD or STD cast1990-09-03 05:13:0056.7333 N, 6.75 WRRS Challenger CH71A
315917CTD or STD cast1990-12-10 03:01:0056.7333 N, 6.7517 WRRS Challenger CH74A_1
382407CTD or STD cast1991-02-24 18:05:0056.7333 N, 6.7433 WRRS Challenger CH75B
316109CTD or STD cast1991-07-02 00:37:0056.7367 N, 6.7467 WRRS Challenger CH81
384254CTD or STD cast1991-11-26 18:21:0056.7333 N, 6.7517 WRRS Challenger CH86B
385012CTD or STD cast1992-03-08 01:20:0056.7317 N, 6.75 WRRS Challenger CH89B
386390CTD or STD cast1992-09-26 02:42:0056.735 N, 6.7467 WRRS Challenger CH97
385294CTD or STD cast1993-03-14 11:43:0056.72 N, 6.7433 WRRS Challenger CH101B
386039CTD or STD cast1993-05-20 17:30:0056.7317 N, 6.745 WRRS Challenger CH103
387983CTD or STD cast1993-09-10 03:14:0056.7333 N, 6.7517 WRRS Challenger CH105
388986CTD or STD cast1994-03-14 22:05:0056.7333 N, 6.75 WRRS Challenger CH110
389596CTD or STD cast1994-05-08 20:55:0056.7333 N, 6.75 WRRS Challenger CH112
390708CTD or STD cast1994-08-15 23:55:0056.7337 N, 6.7405 WRRS Challenger CH114
391877CTD or STD cast1994-11-21 22:12:0056.7328 N, 6.749 WRRS Challenger CH116
434603CTD or STD cast1995-04-14 18:16:0056.7333 N, 6.75 WRRS Charles Darwin CD92B
435643CTD or STD cast1995-05-01 16:45:0056.7333 N, 6.75 WRRS Charles Darwin CD92B
390315CTD or STD cast1995-07-29 18:21:0056.7337 N, 6.7478 WRRS Challenger CH120
433925CTD or STD cast1996-01-11 19:38:0056.7333 N, 6.75 WRRS Challenger CH124
1289218Water sample data1996-01-11 19:38:0056.7333 N, 6.75 WRRS Challenger CH124
1075000CTD or STD cast2000-02-01 15:31:0056.73033 N, 6.7435 WRRS Discovery D245
845200CTD or STD cast2003-07-25 11:33:0056.73518 N, 6.74463 WFS Poseidon PO300_2
666970CTD or STD cast2004-07-12 14:40:0056.7345 N, 6.749 WFS Poseidon PO314
897006CTD or STD cast2005-10-26 03:46:0056.73298 N, 6.7466 WRRS Charles Darwin CD176
776904CTD or STD cast2006-10-30 00:25:4356.732 N, 6.74683 WRRS Discovery D312
847624CTD or STD cast2007-08-31 09:54:1456.73307 N, 6.75098 WRRS Discovery D321B
954775CTD or STD cast2009-06-25 00:31:5656.73456 N, 6.75286 WRRS Discovery D340A
1052953CTD or STD cast2010-05-21 14:24:4156.73117 N, 6.74817 WRRS Discovery D351
1896990Water sample data2010-05-21 14:32:0056.73093 N, 6.74755 WRRS Discovery D351
1195315CTD or STD cast2011-05-20 07:12:5656.7345 N, 6.74617 WRRS Discovery D365
1203267CTD or STD cast2012-08-02 14:59:0056.73297 N, 6.7499 WRRS Discovery D379
1220639CTD or STD cast2013-05-23 21:43:1156.7333 N, 6.75 WRRS James Cook JC086
1371388CTD or STD cast2014-07-17 07:20:3656.7329 N, 6.7497 WRRS James Clark Ross JR20140531 (JR302)
1723575CTD or STD cast2015-06-15 11:32:3656.7335 N, 6.7508 WRRS Discovery DY031
1879476Water sample data2015-06-15 11:36:0056.7335 N, 6.75078 WRRS Discovery DY031
1764833CTD or STD cast2016-06-20 01:04:0356.7333 N, 6.7487 WRRS Discovery DY052
1765965Currents -subsurface Eulerian2016-06-20 01:04:3756.73333 N, 6.74867 WRRS Discovery DY052
1875137Water sample data2016-06-20 01:08:0056.73333 N, 6.74867 WRRS Discovery DY052