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Metadata Report for BODC Series Reference Number 1722559


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_070
BODC Series Reference 1722559
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-14 15:19
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 5.0 decibars
 

Spatial Co-ordinates

Latitude 56.88354 N ( 56° 53.0' N )
Longitude 8.49920 W ( 8° 30.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 115.0 m
Minimum Sensor or Sampling Height 15.0 m
Maximum Sensor or Sampling Height 125.0 m
Sea Floor Depth 130.0 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 = 1722559

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 15G
CategoryOffshore location
Latitude56° 52.98' N
Longitude8° 30.00' W
Water depth below MSL125.0 m

Ellett Line/Extended Ellett Line: Station 15G

Station 15G 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 15G 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 15G was also referred to as Station C9.

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 15G

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
91038CTD or STD cast1977-03-07 21:59:0056.88 N, 8.5 WRRS Challenger CH4/77
91942CTD or STD cast1977-04-14 23:31:0056.8866 N, 8.5 WRRS Challenger CH6B/77
94294CTD or STD cast1977-07-25 01:05:0056.8833 N, 8.5 WRRS Challenger CH11/77
92251CTD or STD cast1978-02-02 23:43:0056.8816 N, 8.49 WRRS Challenger CH2/78
94571CTD or STD cast1978-04-17 17:22:0056.8716 N, 8.4916 WRRS Challenger CH6/78
186154CTD or STD cast1978-08-11 00:25:0056.8833 N, 8.5033 WRRS Challenger CH11B/78
314373CTD or STD cast1978-11-06 03:36:0056.88 N, 8.5 WRRS Challenger CH14B/78
98768CTD or STD cast1979-05-21 20:18:0056.8833 N, 8.5 WRRS Challenger CH7/79
99840CTD or STD cast1979-06-27 21:44:0056.8933 N, 8.515 WRRS Shackleton S5/79
95875CTD or STD cast1979-09-13 22:42:0056.8833 N, 8.5 WRRS Challenger CH13/79
96067CTD or STD cast1979-10-29 16:48:0056.8733 N, 8.4816 WRRS Challenger CH16/79
187759CTD or STD cast1980-03-04 12:05:0056.8833 N, 8.495 WRRS Challenger CH4/80
189698CTD or STD cast1980-06-01 13:27:0056.88 N, 8.49 WRRS Challenger CH9B/80
186928CTD or STD cast1980-10-02 22:10:0056.8833 N, 8.4933 WRRS Challenger CH15/80
312643CTD or STD cast1981-01-29 10:16:0056.8833 N, 8.5 WRRS Challenger CH2/81
187932CTD or STD cast1981-04-13 11:39:0056.8816 N, 8.4916 WRRS Challenger CH6A/81
187944CTD or STD cast1981-04-13 13:00:0056.8816 N, 8.4916 WRRS Challenger CH6A/81
192276CTD or STD cast1981-07-13 01:35:0056.8766 N, 8.505 WRRS Challenger CH10/81
189139CTD or STD cast1982-04-27 00:14:0056.8816 N, 8.4566 WRRS Challenger CH7A/82
193439CTD or STD cast1983-05-24 13:08:0056.8783 N, 8.4916 WRRS Challenger CH7B/83
96854CTD or STD cast1983-08-16 06:37:0056.8833 N, 8.52 WRRS Challenger CH11/83
313197CTD or STD cast1984-06-27 13:20:0056.8817 N, 8.495 WRRS Challenger CH2/84
257937CTD or STD cast1984-12-02 11:01:0056.8816 N, 8.4966 WRRS Challenger CH10/84
258387CTD or STD cast1985-01-26 21:43:0056.8833 N, 8.5 WRRS Challenger CH1/85
253868CTD or STD cast1985-05-08 12:34:0056.8833 N, 8.5 WRRS Challenger CH4/85
261174CTD or STD cast1985-08-20 01:01:0056.8816 N, 8.5 WRRS Challenger CH8/85
255863CTD or STD cast1985-12-16 22:17:0056.8766 N, 8.4983 WRRS Frederick Russell FR13/85
255875CTD or STD cast1985-12-16 23:27:0056.8833 N, 8.5 WRRS Frederick Russell FR13/85
264159CTD or STD cast1987-01-10 04:23:0056.8833 N, 8.5 WRRS Challenger CH9
250594CTD or STD cast1987-04-30 13:00:0056.8833 N, 8.4983 WRRS Challenger CH14
255918CTD or STD cast1987-08-31 12:10:0056.8833 N, 8.5 WRRS Frederick Russell FR18/87
251641CTD or STD cast1987-11-27 21:01:0056.8833 N, 8.5 WRRS Challenger CH22
266941CTD or STD cast1988-03-06 14:59:0056.8833 N, 8.5033 WRRS Challenger CH25
263980CTD or STD cast1988-06-20 14:55:0056.8816 N, 8.505 WRRS Challenger CH30
265347CTD or STD cast1989-01-24 10:35:0056.8833 N, 8.5 WRRS Discovery D180
265845CTD or STD cast1989-05-06 01:40:0056.8833 N, 8.5 WRV Lough Foyle LF1/89
317623CTD or STD cast1989-08-05 05:30:0056.8867 N, 8.5 WRV Lough Foyle LF2/89
315099CTD or STD cast1990-06-28 10:32:0056.88 N, 8.4983 WRRS Challenger CH67A
259852CTD or STD cast1990-09-02 18:36:0056.8833 N, 8.5 WRRS Challenger CH71A
259864CTD or STD cast1990-09-02 20:05:0056.8833 N, 8.5 WRRS Challenger CH71A
315978CTD or STD cast1990-12-10 19:22:0056.8817 N, 8.4983 WRRS Challenger CH74A_1
382481CTD or STD cast1991-02-26 15:15:0056.8833 N, 8.4983 WRRS Challenger CH75B
316183CTD or STD cast1991-07-02 10:59:0056.8817 N, 8.5017 WRRS Challenger CH81
386470CTD or STD cast1992-09-26 13:54:0056.8833 N, 8.5 WRRS Challenger CH97
385349CTD or STD cast1993-03-15 01:18:0056.885 N, 8.5 WRRS Challenger CH101B
385940CTD or STD cast1993-05-20 03:47:0056.8817 N, 8.495 WRRS Challenger CH103
388071CTD or STD cast1993-09-10 22:39:0056.8825 N, 8.5015 WRRS Challenger CH105
389050CTD or STD cast1994-03-17 19:24:0056.88 N, 8.5033 WRRS Challenger CH110
389523CTD or STD cast1994-05-08 09:24:0056.8833 N, 8.5 WRRS Challenger CH112
391957CTD or STD cast1994-11-24 13:11:0056.8767 N, 8.4917 WRRS Challenger CH116
434676CTD or STD cast1995-04-15 07:44:0056.8833 N, 8.5 WRRS Charles Darwin CD92B
435563CTD or STD cast1995-05-01 07:06:0056.8833 N, 8.5 WRRS Charles Darwin CD92B
434001CTD or STD cast1996-01-12 11:41:0056.8833 N, 8.5 WRRS Challenger CH124
1289292Water sample data1996-01-12 11:41:0056.8833 N, 8.5 WRRS Challenger CH124
1014540CTD or STD cast1996-09-30 15:33:0056.88433 N, 8.50383 WRRS Discovery D223A
1850040Water sample data1996-09-30 15:47:0056.88433 N, 8.50391 WRRS Discovery D223A
1070609CTD or STD cast1999-09-11 12:23:0056.88383 N, 8.50967 WRRS Discovery D242
1251939Water sample data1999-09-11 12:31:0056.88383 N, 8.50967 WRRS Discovery D242
1075085CTD or STD cast2000-02-03 03:32:0056.88417 N, 8.49683 WRRS Discovery D245
559241CTD or STD cast2000-05-19 07:11:0056.8833 N, 8.5017 WFRV Scotia 0700S
676780CTD or STD cast2001-05-20 04:18:0056.881 N, 8.49617 WRRS Discovery D253
845119CTD or STD cast2003-07-24 21:45:0056.88298 N, 8.50148 WFS Poseidon PO300_2
776688CTD or STD cast2006-10-26 11:07:1356.88283 N, 8.50467 WRRS Discovery D312
847532CTD or STD cast2007-08-30 18:01:5556.87617 N, 8.49886 WRRS Discovery D321B
880953CTD or STD cast2008-05-23 12:10:0056.8835 N, 8.499 WFRV Scotia 0508S
1616971Water sample data2008-05-23 12:10:0056.8835 N, 8.499 WFRV Scotia 0508S
1203372CTD or STD cast2012-08-03 05:46:0056.8835 N, 8.49866 WRRS Discovery D379
1220744CTD or STD cast2013-05-24 16:25:3856.8827 N, 8.4986 WRRS James Cook JC086
1371284CTD or STD cast2014-07-16 12:36:4256.8828 N, 8.4998 WRRS James Clark Ross JR20140531 (JR302)
1723458CTD or STD cast2015-06-14 15:19:1156.8836 N, 8.4992 WRRS Discovery DY031
1879372Water sample data2015-06-14 15:28:0056.88355 N, 8.49921 WRRS Discovery DY031
1764716CTD or STD cast2016-06-19 07:18:3656.8834 N, 8.4996 WRRS Discovery DY052
1765848Currents -subsurface Eulerian2016-06-19 07:19:2056.88338 N, 8.49964 WRRS Discovery DY052
1875033Water sample data2016-06-19 07:29:0056.88337 N, 8.49965 WRRS Discovery DY052