Metadata Report for BODC Series Reference Number 1763878
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
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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
The Ice Sheet Stability (iSTAR) programme
Background and objectives
The iSTAR programme aims to measure the rate that ice is being lost from the West Antarctic ice sheet, and to improve our understanding of what might be driving this loss how it is changing over time. The rate of loss of water from ice in glaciers in the Antarctic (and Greenland) is more than the amount of water being deposited in these areas by precipitation. This has changed our understanding of these systems and the rate of ice loss is a matter of interest for sea level and climate research. Improving our understanding of the processes and impacts of changes to these systems is vital for better predictions for sea level rise in the future and will feed in to climate research. This programme combines scientific research of glaciers and the surrounding ocean environment (including how they impact each other). Research about the oceans was focused on the Amundsen Sea Sector of West Antarctica with instruments deployed from the research ship RRS James Clark Ross. Research about the ice was focused on Pine Island Glacier, Thwaites Glacier and Union Glacier with measurements taken during two expeditions across the ice. This programme was funded by the Natural Environment Research Council (NERC)
The programme is split in to four projects:
Dynamic ice: Dynamical control on the response of Pine Island Glacier (iSTAR C)
Ice loss: The contribution to sea-level rise of the Amundsen Sea sector of Antarctica (iSTAR D)
Participants
The iSTAR research programme is managed by British Antarctic Survey (BAS) on behalf of NERC. Operational support, in the form of logistics planning and infrastructure, and Communication and Knowledge Exchange support are provided by BAS. There are four science projects and participants in these projects represent the following organisations:
- British Antarctic Survey
- National Oceanography Centre
- Newcastle University
- Scott Polar Research Institute
- University College London
- University of Bristol
- University of East Anglia
- University of Edinburgh
- University of Leeds
- University of Southampton
- University of St. Andrews
- University of Tasmania
- University of Washington
Fieldwork and data collection
A wide range of data parameters were collected for this programme. Physical and chemical measurements of the ocean close to and next to the ice shelf were made using instruments deployed from ship, on moorings, on autonomous platforms and seal tags. Measurements were also made of the glaciers and ice shelfs including radar and seismic surveys and ice cores. There were also meteorological and atmospheric measurements taken. For more information about the data collected on each of the four projects see the project web pages.
Data management
Data management for ocean data will be done by the British Oceanographic Data Centre whilst ice data will be managed by the Polar Data Centre.
For more information about iSTAR programme see the: iSTAR Programme Website
Ocean2ice: Processes and variability of ocean heat transport toward ice shelves in the Amundsen Sea Embayment (iSTAR A)
Background and objectives
Ocean2ice (otherwise referred to as iSTAR A) is a project that is part of NERC's Ice Sheet Stability programme. The project was designed to investigate how relatively warm water gets close to and beneath glaciers in the Antarctic and what impact this warm water has on the rate of ice melt at these sites. This research and collection of data will to feed in to climate and sea level forecasting and research. This project was funded by the Natural Environment Research Council.
Participants
The principal investigator for the Ocean2ice project is Professor Karen Heywood, University of East Anglia. Other participants in the project represent the following organisations:
- British Antarctic Survey
- National Oceanography Centre
- University of East Anglia
- University of Southampton
- University of St. Andrews
Fieldwork and data collection
Oceanographic data were collected from a wide range of instruments from the research ship RRS James Clark Ross between 26 January and 08 March 2014 in the Amundsen Sea. Data collected include measurements of the physical conditions (including temperature and salinity), current speeds and directions, chemical measurements of the water column (including oxygen and chlorophyll-a concentrations). A fleet of Seagliders (ocean robots that measure physical parameters including temperature, salinity and current speeds and directions) were also deployed to measure conditions close to the ice shelf. Moorings were deployed by the project and have measured conditions in the area over a couple of years. In addition Seal tags (small sensors glued to the fur of seals which fall off when the seals moult their fur) were deployed and transmit data back via satellite networks to scientists. These seal tag deployments give the scientists the rare opportunity to measure water properties below the ice shelf.
Data management
All data collected by the Ocean2ice project are to be submitted to the British Oceanographic Data Centre for careful storage, quality control, archiving and distribution to scientists, education, industry and the public.
For more information about Ocean2ice see the iSTAR A project page
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2014-02-16 |
End Date (yyyy-mm-dd) | 2016-02-02 |
Organization Undertaking Activity | British Antarctic Survey |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | PIG_S |
Platform Category | subsurface mooring |
PIG_S Mooring
PIG_S is a mooring array deployed for the iSTAR programme. The mooring was deployed from RRS James Clark Ross cruise JR20140126 in February 2014 and were recovered on RV Araon cruise ANA06B in February 2016.
Deployment date (UTC) | 2014-02-16 13:29 |
---|---|
Recovery date (UTC) | 2016-02-02 13:10 |
Latitude (degrees, +ve North) | -75.0509 |
Longitude (degrees, +ve East) | -102.1525 |
Nominal water depth (m) | 747 |
Instrument setup
Instrument | Serial number | Nominal depth of instrument (m) | Comments |
---|---|---|---|
Aquatec Aqualogger 520PT Temperature/ Pressure Recorder | 1305 | 299.1 | |
300 kHz RDI ADCP | 15547 | 351.7 | |
SeaBird SBE-37 Microcat | 8532 | 354.4 | |
Aquatec Aqualogger 520T Temperature Recorder | 1193 | 436.1 | |
Aquatec Aqualogger 520T Temperature Recorder | 1194 | 503.2 | |
Aquatec Aqualogger 520T Temperature Recorder | 1196 | 570.4 | |
Nortek Aquadopp | 9398 | 640.1 | |
SeaBird SBE-37 Microcat | 8533 | 640.6 | |
Aquatec Aqualogger 520T Temperature Recorder | 1197 | 735 |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | JR20140126 (JR294, JR295) |
Departure Date | 2014-01-26 |
Arrival Date | 2014-03-08 |
Principal Scientist(s) | Karen J Heywood (University of East Anglia School of Environmental Sciences) |
Ship | RRS James Clark Ross |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | iSTAR9 (PIG_S) |
Category | Coastal location |
Latitude | 75° 3.32' S |
Longitude | 102° 9.26' W |
Water depth below MSL | 810.0 m |
iSTAR9 (PIG_S)
Fixed station Area | Latitude, degrees (positive North) | Longitude, degrees (positive East) |
---|---|---|
North-West corner | -75.0570 | -114.3148 |
South-East corner | -75.5528 | -114.3140 |
Water depth = 810 m
Sampling history
Activity | Latitude | Longitude | Deployment date | Recovery date | Instruments | Deployment ship/ cruise | Recovery ship/ cruise | Comments |
---|---|---|---|---|---|---|---|---|
iSTAR9 Mooring | -75.5528 | -102.1525 | 2012-02-24 | 2014-02-12 | one Aquatec Aqualogger (temperature and pressure) two Aquatec Aqualoggers (temperature only) two SeaBird SBE-37 Microcats one Nortec Aqaudopp one 330 kHz RDI ADCP one SeaBird SBE-53 Bottom pressure recorder | RV Araon | RRS James Clark Ross JR20140126 | |
CTD Cast 51 | -75.0570 | -102.1568 | 2014-02-16 | 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 | -75.0570 | -102.1568 | 2014-02-16 | N/A | Salinity | RRS James Clark Ross JR20140126 | N/A | |
PIG_S mooring | -75.0589 | -102.1525 | 2014-02-18 | 2016-02-02 | four 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: PIG_S
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 |
---|---|---|---|---|
1748753 | Currents -subsurface Eulerian | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748765 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748777 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748789 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748790 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748937 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1763891 | Hydrography time series at depth | 2014-02-16 13:40:01 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748661 | Currents -subsurface Eulerian | 2014-02-16 14:00:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748673 | Currents -subsurface Eulerian | 2015-01-01 00:09:28 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748685 | Currents -subsurface Eulerian | 2016-01-01 00:20:19 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
Appendix 2: iSTAR9 (PIG_S)
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 |
---|---|---|---|---|
1716984 | Hydrography time series at depth | 2012-02-24 04:05:00 | 75.05528 S, 102.15437 W | Not applicable |
1716996 | Hydrography time series at depth | 2012-02-24 04:05:01 | 75.05528 S, 102.15437 W | Not applicable |
1717441 | Hydrography time series at depth | 2012-02-24 04:09:53 | 75.05528 S, 102.15437 W | Not applicable |
1717348 | Hydrography time series at depth | 2012-02-24 04:09:56 | 75.05528 S, 102.15437 W | Not applicable |
1717453 | Currents -subsurface Eulerian | 2012-02-24 04:09:59 | 75.05528 S, 102.15437 W | Not applicable |
1717072 | Hydrography time series at depth | 2012-02-24 04:09:59 | 75.05528 S, 102.15437 W | Not applicable |
1717361 | Hydrography time series at depth | 2012-02-24 04:09:59 | 75.05528 S, 102.15437 W | Not applicable |
1748520 | Currents -subsurface Eulerian | 2012-02-24 04:30:00 | 75.05528 S, 102.15437 W | Not applicable |
1748532 | Currents -subsurface Eulerian | 2013-01-01 00:08:16 | 75.05528 S, 102.15437 W | Not applicable |
1748753 | Currents -subsurface Eulerian | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748765 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748777 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748789 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748790 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748937 | Hydrography time series at depth | 2014-02-16 13:40:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1763891 | Hydrography time series at depth | 2014-02-16 13:40:01 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748661 | Currents -subsurface Eulerian | 2014-02-16 14:00:00 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748673 | Currents -subsurface Eulerian | 2015-01-01 00:09:28 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |
1748685 | Currents -subsurface Eulerian | 2016-01-01 00:20:19 | 75.05887 S, 102.15242 W | RRS James Clark Ross JR20140126 (JR294, JR295) |