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Metadata Report for BODC Series Reference Number 2052404


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Nortek Aquadopp 3D doppler current meter  current meters; water temperature sensor
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Prof Penny Holliday
Originating Organization National Oceanography Centre, Southampton
Processing Status QC in progress
Online delivery of data Download not available
Project(s) UK-OSNAP
 

Data Identifiers

Originator's Identifier IB5_01/8365
BODC Series Reference 2052404
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2018-07-05 12:00
End Time (yyyy-mm-dd hh:mm) 2020-10-16 07:00
Nominal Cycle Interval 3600.0 seconds
 

Spatial Co-ordinates

Latitude 57.80100 N ( 57° 48.1' N )
Longitude 19.17067 W ( 19° 10.2' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 880.0 m
Maximum Sensor or Sampling Depth 880.0 m
Minimum Sensor or Sampling Height 20.0 m
Maximum Sensor or Sampling Height 20.0 m
Sea Floor Depth 900.0 m
Sea Floor Depth Source DATAHEAD
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
BTVOLTCM1VoltsVoltage of battery output by in-situ current meter
HEADCM011DegreesOrientation (horizontal) of measurement device relative to True North {heading}
ISCMBMA11DimensionlessSignal return amplitude from the water body by in-situ current meter beam 1
ISCMBMA21DimensionlessSignal return amplitude from the water body by in-situ current meter beam 2
ISCMBMA31DimensionlessSignal return amplitude from the water body by in-situ current meter beam 3
LCEWZZ011Centimetres per secondEastward velocity of water current in the water body
LCNSZZ011Centimetres per secondNorthward velocity of water current in the water body
LRZAZZZZ1Centimetres per secondUpward velocity of water current in the water body
PREXPR011DecibarsPressure (measured variable) exerted by the water body by semi-fixed in-situ pressure sensor and corrected to read zero at sea level
PTCHFG011DegreesOrientation (pitch) of measurement platform by triaxial fluxgate compass
ROLLFG011DegreesOrientation (roll) of measurement platform by triaxial fluxgate compass
TEMPPR011Degrees CelsiusTemperature of the water body

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

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."


Narrative Documents

Nortek Aquadopp Open Water Current Meter

This instrument provides 3D acoustic doppler current measurements along with standard measurements of temperature, pressure, tilt and direction. It can be used in real time measurement situations or can log to an internal recorder powered by internal batteries. It can also be configured to measure surface wave height, period and direction concurrently. It has the unique feature of being run in 'diagnostic' mode when set to collect data at 1 Hz frequency in user specified intervals. This allows studies of mooring motion and the performance of other current meters to be conducted. It can be set in various configurations with titanium housings for deployment at greater depths.

Standard Measured Parameters

  • 3D current velocity (East/North/Up, X/Y/Z or Beam 1/2/3)
  • Acoustic signal strength (Beam 1/2/3)
  • Compass
  • Tilt
  • Temperature
  • Pressure
  • Battery voltage
  • Status code
  • Error code

Surface wave monitoring

The standard Aquadopp is suitable for measuring surface wave height, period, and direction, which are calculated using the PUV method whereby spectra are estimated based on a combination of the pressure signal recorded by the instrument (P) and two horizontal components of the wave orbital velocity (U and V). More specifically, the pressure signal is used to provide an estimate of the wave frequency spectrum. The energy in this spectrum is then used to estimate wave height and period. The measurements of the wave orbital velocities are used to provide an estimate of the wave direction. Since these estimates are based on the distribution of wave energy and are not direct measurements of the free surface, they should be considered inferred estimates.

Both the dynamic pressure and the orbital velocities are driven by surface waves. The signals that are associated with these properties are complicated by the fact that they attenuate (that is the signals are weaker) with depth. The exact behaviour of the attenuation is determined by the water depth and the wavelength being observed. The greater the water depth the greater the attenuation; likewise, the shorter the wavelength (or higher the frequency of the wave) the greater the attenuation for a given water depth. This means that the estimation of wave parameters is limited by both water depth and wave frequency.

Specifications

Water Velocity Measurement
Range ± 5 m/s (standard 300 m version)
± 3 m/s (3000 m and 6000 m versions - higher ranges available on request)
Accuracy 1% of measured value ± 0.5 cm/s
Max. sampling rate 1 Hz, 4 Hz also available on request (standard version)
Internal sampling rate 23 Hz
Measurement Area
Measurement cell size 0.75 m
Measurement cell position 0.35 - 5.0 m
Default position 0.35 - 1.8 m
Doppler uncertainty (noise)
Typical 0.5 - 1.0 cm/s
At 1 Hz sampling rate 1.5 cm/s
Echo Intensity
Acoustic frequency 2 MHz
Resolution 0.45 dB
Dynamic range 90 dB
Sensors
Temperature Thermistor embedded in head
Range -4°C to 40°C
Accuracy/resolution 0.1°C / 0.01°C
Time response 10 min
Compass Magnetometer
Accuracy/Resolution 2° / 0.1° for tilt < 20°
Tilt Liquid level
Maximum tilt 30°
Up or down Automatic detect
Pressure Piezoresistive
Range 0 - 300 m (standard), 0 - 3000 m or 0 - 6000 m
Accuracy/resolution 0.5%
Analogue Inputs
No. of channels 2
Voltage supply 12 V
Voltage input 16 bit A/D
Materials
Standard version Delrin with titanium screws
3000 m version Delrin with titanium screws
6000 m version Titanium with Delrin transducer head
Environmental
Operating temperature -4°C to 40°C
Dimensions
Cylinder 568 mm x 75 mm (standard)
619 mm x 84 mm (3000 m version)
625 mm x 84 mm (6000 m version)
Weight in air 3.5 kg (standard)
3.6 kg (3000 m version)
7.6 kg (6000 m version)
Weight in water Neutral (standard)
1.2 kg (3000 m version)
4.8 kg (6000 m version)

Further details can be found in the manufacturer's specification sheets for the Aquadopp, Aquadopp 3000 and Aquadopp 6000.

Processing by BODC of Moored Current Meters: AR30-04

The Nortek Aquadopp current meter data were supplied to BODC as ASCII files representing the data collected from Aquadopp sensors deployed at the EB1, WB1, and WB2 sites as well as the IB3, IB4, and IB5 sites during cruise AR30-04.

During transfer to BODC internal format (QXF) the originator's variables were mapped to unique BODC parameter codes. The following table shows the paramater mapping:

Originator's Variable Originator's Units BODC Parameter Code BODC Units Comment
YY Year AADYAA01 days Combined with MM and DD to form a date during transfer
MM Month AADYAA01 days Combined with YY and DD to form a date during transfer
DD Day AADYAA01 days Combined with YY and MM to form a date during transfer
HH Hour AAFDZZ01 days Conversion of /24 automatically applied during transfer
P dbar PREXPR01 dbar -
T C TEMPPR01 C -
U cm/s LCEWZZ01 cm/s -
V cm/s LCNSZZ01 cm/s -
W cm/s LRZAZZZZ cm/s -
HDG deg HEADCM01 deg -
PIT deg PTCHFG01 deg -
ROL deg ROLLFG01 deg -
IPOW V BTVOLTCM V -
USS counts ISCMBMA1 dimensionless -
VSS counts ISCMBMA2 dimensionless -
WSS counts ISCMBMA3 dimensionless -
CS cm/s LCSAZZ01 cm/s Channel not supplied for the IB moorings.
CD deg LCDAZZ01 deg Channel not supplied for the IB moorings.

Following transfer the data were screened using BODC in-house visualisation software. Suspect data values were assigned the appropriate BODC data quality flag. Missing data values, where present, were changed to the missing data value and assigned a BODC data quality flag.

Processing by originator of Moored Current Meters: AR30-04

Sampling Strategy

During the RV Neil Armstrong cruise AR30-04, 6 Nortek Aquadopps were deployed at the UK-OSNAP EB1 site, 5 at the WB1 site, and 3 at the WB2 site. Additionally, 3 Nortek Aquadopps were deployed at the IB3 site, 3 at the IB4 site, and 2 at the IB5 site. These moorings were recovered during the RRS Discovery cruise DY120.

Mooring site Mooring location (latitude, longitude) Water depth (m) Deployment time (GMT) Recovery time (GMT)
EB1 57.1005, -9.5683 1800 08/07/2018 17:00 12/10/2020 10:30
WB1 57.4693, -12.7057 1600 06/07/2018 17:00 14/10/2020 07:00
WB2 57.4717, -12.3117 1600 09/07/2018 22:30 14/10/2020 07:00
IB3 57.9901, -24.3533 2850 03/07/2018 18:00 19/10/2020 12:30
IB4 57.9898, -21.1462 2919 04/07/2018 17:00 17/10/2020 11:00
IB5 57.801, -19.1707 900 05/07/2018 12:00 16/10/2020 07:00

Data Acquisition and Initial Processing

The data were downloaded from the instruments with metadata recorded, and were corrected for water depth and the magnetic declination. The data were then converted to RODB format and merged with the metadata file, and the launch and recovery periods removed from the data.

The processed data were supplied to BODC for banking.


Project Information

UK - Overturning in the Subpolar North Atlantic Programme (UK-OSNAP) Programme

UK-OSNAP is part of an international collaboration to establish a transoceanic observing system in the subpolar North Atlantic. The aim is to quantify and understand the Subpolar Gyre's response to local and remote forcing of mass, heat and freshwater fluxes, within the conceptual framework of the Atlantic Meridional Overturning Circulation (AMOC).

UK-OSNAP is developing a new observing system to provide a continuous record of full-depth, trans-basin mass, heat, and freshwater fluxes. Combining these sustained measurements with innovative modelling techniques will enable the project to characterise the circulation and fluxes of the North Atlantic Subpolar Gyre.

UK-OSNAP is funded by the Natural Environment Research Council (NERC). The project is led by the National Oceanography Centre (NOC) with partners in the University of Liverpool, the University of Oxford and the Scottish Association for Marine Science (SAMS). It is a part of international OSNAP that is led by USA and includes 10 further partner groups in Canada, France, Germany, the Netherlands and China. The project involves fieldwork at sea and model studies.

The OSNAP observing system consists of two legs: one extending from southern Labrador to the southwestern tip of Greenland across the mouth of the Labrador Sea (OSNAP West), and the second from the southeastern tip of Greenland to Scotland (OSNAP East). The observing system also includes subsurface floats (OSNAP Floats) in order to trace the pathways of overflow waters in the basin and to assess the connectivity of currents crossing the OSNAP line.

NERC have added an extension to UK-OSNAP, until October 2024. This will result in the UK-OSNAP-Decade: 10 years of observing and understanding the overturning circulation in the subpolar North Atlantic (2014-2024).


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2018-07-05
End Date (yyyy-mm-dd) 2020-10-16
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierIB5_07_2018
Platform Categorysubsurface mooring

Ellett Array Moored Instruments IB5 2018-2020

This rig was deployed as part of the Iceland Basin Array.

Deployment Cruise RV Neil Armstrong 30-04
Recovery Cruise RRS Discovery DY120

The rig was held down by a 1300 kilogram anchor on the seabed at 900 metres depth. It was kept erect by 44" syntactic float at 75 metres depth and 2 glass spheres at 30 metres depth.

The instruments deployed on the rig were as follows:

There were no issues with any of the sensors reported.

Approximate Depth(m) Instrument Serial Number
33 SBE37 SMP MicroCAT 11333
75 RDI WorkHorse 300kHz ADCP - Up 20959
76 RDI WorkHorse 300kHz ADCP - Down 13872
89 SBE37 SMP MicroCAT 8082
329 SBE37 SMP MicroCAT 9376
480 SBE37 SMP MicroCAT 8443
486 Nortek Aquadopp 9867
685 SBE37 SMP MicroCAT 11339
874 SBE37 SMP MicroCAT 14367
880 Nortek Aquadopp 8365

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name AR30-04 (F2018-007, OSNAP East 2018)
Departure Date 2018-07-01
Arrival Date 2018-07-29
Principal Scientist(s)William E Johns (Rosenstiel School of Marine and Atmospheric Science)
Ship RV Neil Armstrong

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameExtended Ellett Line Station IB5
CategoryOffshore location
Latitude58° 52.98' N
Longitude17° 0.00' W
Water depth below MSL1150.0 m

Extended Ellett Line: Fixed Station IB5

Station IB5 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.

From 2018 this mooring contributed to the UK-OSNAP project. It was referred to as the OSNAP Iceland Basin Array.

Related Fixed Station activities are detailed in Appendix 2


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
B nominal value
Q value below limit of quantification

Appendix 1: IB5_07_2018

Related series for this Data Activity 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
2052416Currents -subsurface Eulerian2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052686Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052698Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052705Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052717Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052729Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052730Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052742Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)

Appendix 2: Extended Ellett Line Station IB5

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
1008430CTD or STD cast1997-09-12 06:01:0058.863 N, 17.00733 WRRS Discovery D230
1304917Water sample data1997-09-12 06:39:0058.86299 N, 17.0073 WRRS Discovery D230
2131498Water sample data1997-09-12 06:39:0058.86299 N, 17.0073 WRRS Discovery D230
1070879CTD or STD cast1999-09-14 21:30:0058.85183 N, 17.01317 WRRS Discovery D242
1252224Water sample data1999-09-14 21:51:0058.85183 N, 17.01317 WRRS Discovery D242
670526CTD or STD cast2001-05-08 08:18:0058.95833 N, 16.97783 WRRS Discovery D253
667310CTD or STD cast2004-07-16 08:43:0058.96433 N, 16.98833 WFS Poseidon PO314
847335CTD or STD cast2007-08-27 19:39:3958.87575 N, 16.99409 WRRS Discovery D321B
954112CTD or STD cast2009-06-15 09:48:1858.883 N, 17.00224 WRRS Discovery D340A
1053538CTD or STD cast2010-05-17 20:45:0358.88867 N, 17.01717 WRRS Discovery D351
1929813Currents -subsurface Eulerian2010-05-17 20:45:4558.8849 N, 17.0213 WRRS Discovery D351
1896615Water sample data2010-05-17 21:33:0058.89147 N, 17.01326 WRRS Discovery D351
1195604CTD or STD cast2011-05-29 02:08:4758.88317 N, 17.00283 WRRS Discovery D365
1204050CTD or STD cast2012-08-10 23:55:0058.88362 N, 17.00021 WRRS Discovery D379
1220246CTD or STD cast2013-05-17 11:31:5058.8838 N, 17.0018 WRRS James Cook JC086
2098229Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2098684Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2099208Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2099780Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2100334Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2101325Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
2101872Water sample data2013-05-17 12:12:0058.88389 N, 17.25278 WRRS James Cook JC086
1370754CTD or STD cast2014-07-09 12:13:2058.853 N, 17.0012 WRRS James Clark Ross JR20140531 (JR302)
1722989CTD or STD cast2015-06-07 10:57:0458.8831 N, 17.0 WRRS Discovery DY031
1722062Currents -subsurface Eulerian2015-06-07 10:57:3358.88305 N, 16.99996 WRRS Discovery DY031
2150029Water sample data2015-06-07 11:33:3058.88306 N, 16.99996 WRRS Discovery DY031
1878910Water sample data2015-06-07 11:34:0058.88306 N, 16.99996 WRRS Discovery DY031
1764360CTD or STD cast2016-06-14 09:23:5658.8831 N, 17.0024 WRRS Discovery DY052
1765492Currents -subsurface Eulerian2016-06-14 09:24:0258.88311 N, 17.00245 WRRS Discovery DY052
1874681Water sample data2016-06-14 10:00:0058.88311 N, 17.00245 WRRS Discovery DY052
2149213Water sample data2016-06-14 10:00:2858.88311 N, 17.00245 WRRS Discovery DY052
1976258CTD or STD cast2017-05-20 22:24:4158.883 N, 17.0004 WRRS Discovery DY078 (DY079)
2052416Currents -subsurface Eulerian2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052686Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052698Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052705Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052717Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052729Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052730Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)
2052742Hydrography time series at depth2018-07-05 12:00:0057.801 N, 19.17067 WRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)