Metadata Report for BODC Series Reference Number 1748612
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
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 Activity | British Antarctic Survey |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | iSTAR8 |
Platform Category | subsurface 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 Name | iSTAR8 (mid-shelf) |
Category | Coastal location |
Latitude | 74° 51.80' S |
Longitude | 102° 6.25' W |
Water depth below MSL | 954.0 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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
1748600 | Currents -subsurface Eulerian | 2012-02-22 17:00:00 | 74.8633 S, 102.10417 W | Not applicable |
1717428 | Hydrography time series at depth | 2012-02-23 18:39:53 | 74.8633 S, 102.10417 W | Not applicable |
1717489 | Currents -subsurface Eulerian | 2012-02-23 18:39:59 | 74.8633 S, 102.10417 W | Not applicable |
1717011 | Hydrography time series at depth | 2012-02-23 18:40:01 | 74.8633 S, 102.10417 W | Not applicable |
1717023 | Hydrography time series at depth | 2012-02-23 18:40:01 | 74.8633 S, 102.10417 W | Not applicable |
1717324 | Hydrography time series at depth | 2012-02-23 18:44:53 | 74.8633 S, 102.10417 W | Not applicable |
1717336 | Hydrography time series at depth | 2012-02-23 18:44:57 | 74.8633 S, 102.10417 W | Not applicable |
1717312 | Hydrography time series at depth | 2012-02-23 18:45:00 | 74.8633 S, 102.10417 W | Not applicable |
1717300 | Hydrography time series at depth | 2012-02-23 18:45:04 | 74.8633 S, 102.10417 W | Not 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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
1748600 | Currents -subsurface Eulerian | 2012-02-22 17:00:00 | 74.8633 S, 102.10417 W | Not applicable |
1717428 | Hydrography time series at depth | 2012-02-23 18:39:53 | 74.8633 S, 102.10417 W | Not applicable |
1717489 | Currents -subsurface Eulerian | 2012-02-23 18:39:59 | 74.8633 S, 102.10417 W | Not applicable |
1717011 | Hydrography time series at depth | 2012-02-23 18:40:01 | 74.8633 S, 102.10417 W | Not applicable |
1717023 | Hydrography time series at depth | 2012-02-23 18:40:01 | 74.8633 S, 102.10417 W | Not applicable |
1717324 | Hydrography time series at depth | 2012-02-23 18:44:53 | 74.8633 S, 102.10417 W | Not applicable |
1717336 | Hydrography time series at depth | 2012-02-23 18:44:57 | 74.8633 S, 102.10417 W | Not applicable |
1717312 | Hydrography time series at depth | 2012-02-23 18:45:00 | 74.8633 S, 102.10417 W | Not applicable |
1717300 | Hydrography time series at depth | 2012-02-23 18:45:04 | 74.8633 S, 102.10417 W | Not applicable |
1748728 | Currents -subsurface Eulerian | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748808 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748821 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748833 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748845 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748857 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748869 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748949 | Hydrography time series at depth | 2014-02-18 14:20:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1763922 | Hydrography time series at depth | 2014-02-18 14:20:01 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1763934 | Hydrography time series at depth | 2014-02-18 14:20:01 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748624 | Currents -subsurface Eulerian | 2014-02-18 14:30:00 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748636 | Currents -subsurface Eulerian | 2015-01-01 00:08:12 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748648 | Currents -subsurface Eulerian | 2016-01-01 00:17:41 | 74.8672 S, 102.07992 W | RRS James Clark Ross JR20140126 (JR294, JR295) |