Metadata Report for BODC Series Reference Number 1717023
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 |
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Time Co-ordinates(UT) |
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Parameters |
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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
Sea-Bird SBE 37-SM MicroCAT
The SBE 37-SM MicroCAT is a high accuracy conductivity and temperature recorder (pressure optional). Designed for moorings and other long-duration, fixed-site deployments, MicroCATs have non-corroding titanium housings rated for operation to 7000 metres or pressure sensor full scale-range. Communication with the MicroCAT is over an internal, 3-wire, RS-232C link. The MicroCAT's aged and pressure-protected thermistor has a long history of exceptional accuracy and stability (typical drift is less than 0.002° per year). Electrical isolation of the conductivity electronics eliminates any possibility of ground-loop noise.
Specifications
Temperature (°C) | Conductivity (S m-1) | Optional Pressure | |
---|---|---|---|
Measurement Range | -5 to +35 | 0 to 7 (0 to 70 mS cm-1) | 0 to full scale range: 20 / 100 / 350 / 1000 / 2000 / 3500 / 7000 metres |
Initial accuracy | 0.002 | 0.0003 | 0.1% of full scale range |
Typical Stability | 0.0002 per month | 0.0003 per month | 0.05% of full scale range per year |
Resolution | 0.0001 | 0.00001 | 0.002% of full scale range |
Sensor Calibration | +1 to +32 | 0 to 6; physical calibration over range 2.6 to 6 S m-1, plus zero conductivity (air) | Ambient pressure to full scale range in 5 steps |
Memory | 8 Mbyte non-volatile FLASH memory | ||
Data Storage | Converted temperature and conductivity: 6 bytes per sample (3 bytes each) Time: 4 bytes per sample Pressure (optional): 5 bytes per sample | ||
Real-Time Clock | 32,768 Hz TCXO accurate to ±1 minutes year-1 | ||
Standard Internal Batteries | Nominal 10.6 Ampere-hour pack consisting of 12 AA lithium batteries. Provides sufficient capacity for more than 630,000 samples for a typical sampling scheme | ||
Housing | Titanium pressure case rated at 7000 metres | ||
Weight (without pressure) | In water: 2.3 kg In air: 3.8 kg |
Further information can be found via the following link: SBE 37-SM MicroCAT Datasheet
BODC Processing - iSTAR Moored Microcats
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 | Originator's units | Description | BODC Parameter Code | BODC Units | Comments |
---|---|---|---|---|---|
temp | Degrees Celsius | Temperature of the water body | TEMPPR01 | Degrees Celsius | |
cond | mS/cm | Electrical conductivity of the water body | CNDCPR01 | S/m | A unit conversion of /10 has been applied to the data |
press | dbar | Pressure exerted by the water body by fixed in situ pressure sensor and corrected to read zero at sea level | PRESPS01 | dbar | |
salin | dimensionless | Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm | PSALPR01 | dimensionless | |
Sigma-theta of the water body by CTD and computation from salinity and potential temperature using UNESCO algorithm | SIGTPR01 | kg/m3 | Derived by BODC | ||
Potential temperature of the water body by computation using UNESCO 1983 algorithm | POTMCV01 | Degrees Celsius | Derived by BODC |
Following transfer to QXF, the data were quality controlled using BODC's in-house visualisation software.
Originator's processing - iSTAR Moored Microcats
Temperature, Conductivity and Pressure data were collected from SeaBird SBE-37 Microcats deployed on mooring arrays.
The originator calibrated data from the moorings with data from CTD casts taken at deployment and recovery. The Mircocats were removed from the mooring upon recovery and attached to the CTD frame to enable calibration against the ship's CTD sensors. Where appropriate offsets were applied (these are documented in the table below). In addition the conductivity and salinity data have had outliers (spikes) and few longer periods of bad data removed (set to NaN) prior to the data being supplied to BODC. It is presumed by the originator that these bad data were caused by fouling of the conductivity sensor.
2012 Deployments
Mooring | Serial number | Temperature offset applied (degrees Celsius) | Conductivity offset applied (mS/cm) | Pressure offset applied (dbar) | Pressure scale applied (dbar) |
---|---|---|---|---|---|
istar1 | 8530 | 0.0005 | 0.0020 | 0 | 0 |
istar1 | 8531 | 0.0005 | 0.0010 | 0 | 0 |
istar4 | 8543 | 0 | 0.0035 | 0 | 0 |
istar4 | 8544 | 0 | 0.0035 | 0 | 0 |
istar5 | 8540 | 0 | 0.0150 | 0 | 0 |
istar5 | 8541 | 0 | 0.0040 | 0 | 0 |
istar5 | 8542 | 0 | 0.0025 | 0 | 0 |
istar6 | 8538 | 0 | 0.0055 | 0 | 0 |
istar6 | 8539 | 0.0030 | 0.0027 | 0.5 | 0 |
istar7 | 8532 | 0 | 0.0060 | 0 | 0 |
istar7 | 8533 | 0.0013 | 0.0030 | -0.5 | 0 |
istar8 | 8534 | -0.0015 | 0.0040 | 0 | 0 |
istar8 | 8535 | -0.0003 | 0.01200 | 0 | 0 |
istar9 | 8536 | 0.0006 | 0.01000 | 0 | 0 |
istar9 | 8537 | -0.0015 | 0.00900 | 0 | 0 |
2014 Deployments
Mooring | Serial number | Temperature offset applied (degrees Celsius) | Conductivity offset applied (mS/cm) | Pressure offset applied (dbar) | Pressure scale applied (dbar) |
---|---|---|---|---|---|
pig_n | 8539 | 0.001 | 0.0027 | 0.5 | 0 |
pig_n | 8538 | 0 | 0.0055 | 0 | 0 |
pig_s | 8532 | 0 | 0.006 | 0 | 0 |
pig_s | 8533 | 0.0013 | 0.003 | 0.5 | 0 |
trough_w | 8536 | 0.0006 | 0.01 | 0 | 0 |
trough_w | 8537 | -0.0015 | 0.009 | 0 | 0 |
trough_e | 8543 | 0 | 0.0035 | 0 | 0 |
trough_e | 8544 | 0 | 0.0035 | 0 | 0 |
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 |
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 |
1748612 | Currents -subsurface Eulerian | 2013-01-01 00:08:18 | 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 |
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 |
1748612 | Currents -subsurface Eulerian | 2013-01-01 00:08:18 | 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) |