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Metadata Report for BODC Series Reference Number 1748612


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI Workhorse Sentinel-300 ADCP  current profilers
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Mr Povl Abrahamsen
Originating Organization British Antarctic Survey
Processing Status banked
Online delivery of data Download not available
Project(s) -
 

Data Identifiers

Originator's Identifier MOORING_ISTAR8_ADCP_15384_2013
BODC Series Reference 1748612
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2013-01-01 00:08
End Time (yyyy-mm-dd hh:mm) 2013-07-07 20:43
Nominal Cycle Interval 1800.0 seconds
 

Spatial Co-ordinates

Latitude 74.86330 S ( 74° 51.8' S )
Longitude 102.10417 W ( 102° 6.3' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 903.08 m
Maximum Sensor or Sampling Depth 905.06 m
Minimum Sensor or Sampling Height 48.94 m
Maximum Sensor or Sampling Height 50.91 m
Sea Floor Depth 954.0 m
Sea Floor Depth Source CRREP
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 Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
BINNUMBR0DimensionlessBin number
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
HEADCM011DegreesOrientation (horizontal relative to true north) of measurement device {heading}
PPSAPR011MetresDepth below surface of the water body by semi-fixed in-situ pressure sensor and conversion to depth using unspecified algorithm
PTCHFG011DegreesOrientation (pitch) of measurement platform by triaxial fluxgate compass
ROLLFG011DegreesOrientation (roll angle) of measurement platform by triaxial fluxgate compass
TEMPPR011Degrees CelsiusTemperature of the water body
DBINAA012MetresDepth (spatial coordinate) of ADCP bin relative to water surface {bin depth} in the water body
LCEWAP012Centimetres per secondEastward velocity of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP)
LCNSAP012Centimetres per secondNorthward velocity of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP)
LERRAP012Centimetres per secondError velocity of water current in the water body by moored acoustic doppler current profiler (ADCP)
LRZAAP012Centimetres per secondUpward velocity of water current in the water body by moored acoustic doppler current profiler (ADCP)
PCGDAP002PercentAcceptable proportion of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 1
PCGDAP022PercentAcceptable proportion of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 2
PCGDAP032PercentAcceptable proportion of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 3
PCGDAP042PercentAcceptable proportion of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 4
TNIHCE012CountsEcho intensity of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 1
TNIHCE022CountsEcho intensity of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 2
TNIHCE032CountsEcho intensity of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 3
TNIHCE042CountsEcho intensity of acoustic signal returns from the water body by moored acoustic doppler current profiler (ADCP) beam 4

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

Quality report - iSTAR Moorings

It is clear from data from pressure sensors (and other sensors measuring the orientation of instruments on the mooring) that the iSTAR moorings were occasionally displaced in the water column. Given the location of the mooring it is likely that this disruption was caused by ice bergs knocking in to the mooring array. This was particularly noticeable in the data from moorings iSTAR6 (where the array became ~ 60m deeper on 05 January 2013), iSTAR9 (where the array became ~ 10 m deeper between 14 and 17 November 2013) and PIG_S (where the array became ~ 50 m deeper on the 20 July 2014 and then ~50 m deeper again on 30 July 2015).


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

RD Instruments 300kHz Workhorse Sentinel Acoustic Doppler Current Profiler

Specifications

Water velocity measurements relative to the ADCP
Maximum velocity 10 m.s-1
Standard deviation 130, 45, 25, 12, 5 mm.s-1 for depth cell sizes of 1, 2, 4, 8, 16 m, respectively
Minimum time between pings 0.07 s
Maximum profiling range* 110, 120, 130, 150, 165 m for depth cell sizes of 1, 2, 4, 8, 16 m, respectively
Minimum range to start of first depth cell 3 m
Number of depth cells 1 - 128 cells
Depth cell size 1 - 16 cm
Echo Intensity measurements
Uncertainty ± 1.5 dB
Sampling Uses same depth cells and time intervals as velocity
Sensors
Water level resolution 0.25 m
Water level accuracy ± 5 m over 0-200 m depth
Temperature range -5°C to + 45°C
Temperature uncertainty ± 0.4°C
Tilt range ± 20°
Tilt uncertainty ± 2°
Compass uncertainty ± 5° at 60° magnetic dip angle
Compass maximum tilt 20°
Physical and Environmental
Maximum depth 200 m
Operating temperature -5°C to 60°C
Storage Temperature -5°C to 80°C

The manufacturer's specification document can be found here

BODC Processing - iSTAR Moored RDI ADCP

Data were received by BODC in Matlab files, with one file containing all data from an iSTAR mooring array. The data were reformatted to QXF (a NetCDF file format) by in house software. A separate QXF file was created for data from each instrument. Metadata were also extracted from the originator's file and used to populate the BODC database.

The following tables shows how the variables within the files were mapped to appropriate BODC parameter codes:

Originator's parameter name Origintator's units Description BODC Parameter Code BODC Units Comments
bindepth metres Depth below sea surface of the middle of each velocity bin (ADCP bin). DBINAA01 metres  
depth Metres Depth below surface of the water body by semi-fixed in-situ pressure sensor and conversion to depth using unspecified algorithm PPSAPR01 Metres  
east_vel m/s Eastward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP) LCEWAP01 Cm/s Conversion of *100 applied
error_vel m/s Current velocity error in the water body by moored acoustic doppler current profiler (ADCP) LERRAP01 Cm/s Conversion of *100 applied
heading Degrees Orientation (horizontal relative to true north) of measurement device {heading} HEADCM01 Degrees  
intens Counts Echo intensity from the water body by moored acoustic doppler current profiler (ADCP) beams 1-4 TNIHCE01 - Beam 1
TNIHCE02 -Beam 2
TNIHCE03 -Beam 3
TNIHCE04 - Beam 4
Counts  
north_vel m/s Northward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP) LCNSAP01 Cm/s Conversion of *100 applied
perc_good % Acceptable proportion of signal returns by moored acoustic doppler current profiler (ADCP) of each beam. (Pings received as a percentage of pings sent) PCGDAP00 - Beam 1
PCGDAP02 - Beam 2
PCGDAP03 -Beam 3
PCGDAP04 - Beam 4
%  
pitch degrees Orientation (pitch) of measurement platform by triaxial fluxgate compass PTCHFG01 degrees  
roll degrees Orientation (roll angle) of measurement platform by triaxial fluxgate compass ROLLFG01 degrees  
temperature Degrees Celsius Temperature of the water body. TEMPPR01 Degrees Celsius  
vert_vel m/s Upward current velocity in the water body by moored acoustic doppler current profiler (ADCP) LRZZAAP01 Cm/s Conversion of *100 applied

Due to the volume of data supplied the datasets have been stored as yearly files (so a mooring that was deployed in 2012 and recovered in 2014 will have been split in to three datasets).

Following transfer to QXF, the data were quality controlled using BODC's in-house visualisation software.

Originator's processing - iSTAR Moored RDI ADCPs

Data processing

The originator calibrated data from the moorings with data from CTD casts taken at deployment and recovery. Instrument depths have been corrected based on pressure data from adjacent instruments. Corrections have not been made for speed of sound, as these corrections were estimated by the originator to be insignificant. Where appropriate temperature and pressure offsets were applied (these are documented in the table below.

The magnetic variation calculated from the International Geomagnetic Reference Field (IGRF) at each mooring position on 01 January 2013 was recorded. The following variables had magnetic variation corrections applied by the originator:

  • current direction
  • northward component of current
  • eastward component of current

Magnetic variation corrections weren't applied to heading

The full data from ADCP s/n 15460 on iSTAR7 have not been ingested by BODC, because of the large amounts of data this instrument recorded. The data in the file supplied by the originator that BODC ingested are the averages of each hourly four-minute burst (of 120 ensembles, each containing four 2-Hz pings).

Offsets applied

Mooring Deployment period Instrument Serial number Temperature offset applied (degrees Celsius) Pressure offset applied (dbar) Magnetic variation recorded
iSTAR1 2012 -2014 Teledyne RDI 75 kHz Workhorse Long-Ranger ADCP 15519 0.0540 -2.2000 50.2416
iSTAR7 2012 -2014 Teledyne RDI Workhorse Sentinel-600 ADCP 15460 0.0230   49.2708
iSTAR7 2012 -2014 Teledyne RDI 75 kHz Workhorse Long-Ranger ADCP 15579 0.0650 -4.1000 49.2708
iSTAR8 2012 -2014 Teledyne RDI Workhorse Sentinel-300 ADCP 15384 0.1140   48.0830
iSTAR9 2012 -2014 Teledyne RDI Workhorse Sentinel-300 ADCP 15547 0.0810   48.3715
PIG_N 2014 -2016 Teledyne RDI Workhorse Sentinel-300 ADCP 15384 0.1140   47.9776
PIG_S 2014 -2016 Teledyne RDI Workhorse Sentinel-300 ADCP 15547 0.0810   48.2791

Echo intensity coefficients

The echo intensity data were provided to BODC by the originator with units of counts. This unit is a proprietary unit, but it is proportional to decibels (dB). The manufacturer has supplied coefficients for each ADCP and each beam (Kc coefficient) which can be used to calibrate and convert the echo intensity from units of Count to units of dB. BODC has not applied these coefficients, but they are available in the table below (so that an end-user can decide what is best for their processing needs).

Sensor serial number Beam Kc Coefficient (dB/ count)
15519 1 0.42
15519 2 0.42
15519 3 0.42
15519 4 0.41
15460 1 0.408
15460 2 0.4048
15460 3 0.4086
15460 4 0.3944
15579 1 0.46
15579 2 0.40
15579 3 0.401
15579 4 0.40
15384 1 0.4213
15384 2 0.4092
15384 3 0.4276
15384 4 0.4209
15547 1 0.4164
15547 2 0.4229
15547 3 0.4219
15547 4 0.4168

Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2012-02-23
End Date (yyyy-mm-dd) 2014-02-12
Organization Undertaking ActivityBritish Antarctic Survey
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifieriSTAR8
Platform Categorysubsurface mooring

iSTAR8 Mooring

iSTAR8 is a mooring array deployed for the iSTAR programme. The mooring was deployed from RV Araon in February 2012 and recovered from RRS James Clark Ross cruise JR20140126 in February 2014.

Deployment date (UTC) 2012-02-23 18:26
Recovery date (UTC) 2014-02-12 17:12
Latitude (+ve North) -74.8633
Longitude (+ve East) -102.1042
Nominal water depth (m) 954

Instrument setup

Instrument Serial number Nominal depth of instrument (m) Comments
Aquatec Aquatec Aqualogger 520PT Temperature and Pressure recorder 1306 471  
Aquatec Aquatec Aqualogger 520T Temperature recorder 1198 571  
Nortek Aquadopp 9391 671  
SeaBird SBE-37 Microcat 8534 672  
Aquatec Aquatec Aqualogger 520T Temperature recorder 1199 763  
Aquatec Aquatec Aqualogger 520T Temperature recorder 1200 863  
300 kHz RDI ADCP 15384 911  
SeaBird SBE-37 Microcat 8353 914  
Aquatec Aquatec Aqualogger 520T Temperature recorder 1201 938  

Related Data Activity activities are detailed in Appendix 1


Fixed Station Information

Fixed Station Information

Station NameiSTAR8 (mid-shelf)
CategoryCoastal location
Latitude74° 51.80' S
Longitude102° 6.25' W
Water depth below MSL954.0 m

iSTAR8 (PIG_N)

Fixed station Area Latitude, degrees (positive North) Longitude, degrees (positive East)
North-West corner -74.8633 -102.1042
South-East corner -74.8672 -102.0799

Water depth = 954 m

Sampling history

Activity Latitude Longitude Deployment date Recovery date Instruments Deployment ship/ cruise Recovery ship/ cruise Comments
iSTAR8 Mooring -74.8633 -102.1042 2012-02-23 2014-02-12 one Aquatec Aqualogger (temperature and pressure)
four Aquatec Aqualoggers (temperature only)
two SeaBird SBE-37 Microcats
one Nortec Aqaudopp
one 300 kHz RDI ADCP
RV Araon RRS James Clark Ross JR20140126  
CTD Cast 59 -74.8647 -102.0837 2014-02-18 N/A SeaBird SBE 911plus CTD
C-Star transmissometer
Aquatracka Fluorometer
SeaBird SBE-43 Oxygen sensor
PAR sensor
Altimeter PA200
RRS James Clark Ross JR20140126 N/A  
CTD bottle samples -74.8647 -102.0837 2014-02-18 N/A Salinity RRS James Clark Ross JR20140126 N/A  
PIG_N mooring -74.8672 -102.0799 2014-02-18 2016-02-02 one Aquatec Aqualogger (temperature and pressure)
six Aquatec Aqualoggers (temperature only)
two SeaBird SBE-37 Microcats
one Nortec Aqaudopp
one 300 kHz RDI ADCP
RRS James Clark Ross JR20140126 RV Araon ANA06B  .

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: iSTAR8

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
1748600Currents -subsurface Eulerian2012-02-22 17:00:0074.8633 S, 102.10417 WNot applicable
1717428Hydrography time series at depth2012-02-23 18:39:5374.8633 S, 102.10417 WNot applicable
1717489Currents -subsurface Eulerian2012-02-23 18:39:5974.8633 S, 102.10417 WNot applicable
1717011Hydrography time series at depth2012-02-23 18:40:0174.8633 S, 102.10417 WNot applicable
1717023Hydrography time series at depth2012-02-23 18:40:0174.8633 S, 102.10417 WNot applicable
1717324Hydrography time series at depth2012-02-23 18:44:5374.8633 S, 102.10417 WNot applicable
1717336Hydrography time series at depth2012-02-23 18:44:5774.8633 S, 102.10417 WNot applicable
1717312Hydrography time series at depth2012-02-23 18:45:0074.8633 S, 102.10417 WNot applicable
1717300Hydrography time series at depth2012-02-23 18:45:0474.8633 S, 102.10417 WNot applicable

Appendix 2: iSTAR8 (mid-shelf)

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
1748600Currents -subsurface Eulerian2012-02-22 17:00:0074.8633 S, 102.10417 WNot applicable
1717428Hydrography time series at depth2012-02-23 18:39:5374.8633 S, 102.10417 WNot applicable
1717489Currents -subsurface Eulerian2012-02-23 18:39:5974.8633 S, 102.10417 WNot applicable
1717011Hydrography time series at depth2012-02-23 18:40:0174.8633 S, 102.10417 WNot applicable
1717023Hydrography time series at depth2012-02-23 18:40:0174.8633 S, 102.10417 WNot applicable
1717324Hydrography time series at depth2012-02-23 18:44:5374.8633 S, 102.10417 WNot applicable
1717336Hydrography time series at depth2012-02-23 18:44:5774.8633 S, 102.10417 WNot applicable
1717312Hydrography time series at depth2012-02-23 18:45:0074.8633 S, 102.10417 WNot applicable
1717300Hydrography time series at depth2012-02-23 18:45:0474.8633 S, 102.10417 WNot applicable
1748728Currents -subsurface Eulerian2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748808Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748821Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748833Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748845Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748857Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748869Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748949Hydrography time series at depth2014-02-18 14:20:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1763922Hydrography time series at depth2014-02-18 14:20:0174.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1763934Hydrography time series at depth2014-02-18 14:20:0174.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748624Currents -subsurface Eulerian2014-02-18 14:30:0074.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748636Currents -subsurface Eulerian2015-01-01 00:08:1274.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)
1748648Currents -subsurface Eulerian2016-01-01 00:17:4174.8672 S, 102.07992 WRRS James Clark Ross JR20140126 (JR294, JR295)