IMAS Metadata Catalogue
A 3D map of englacial attenuation rate from radar reflections at Law Dome, East Antarctica
The East Antarctic Ice Sheet (EAIS) is the largest source of potential sea-level rise, containing some 19 m of sea-level equivalent. One of the well-investigated regions in East Antarctica is Law Dome, which is a small independent ice cap situated to the west of Totten Ice Shelf. The ice cap is slow-moving, has a low melt-rate at the surface and moderate wind speeds, making it a useful study site for our investigations. Radar data from Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP) project has good coverage over this area. A new method is proposed for the estimation of attenuation rate from radar data which is mathematically modeled as a constrained regularised l2 minimization problem. In the proposed method, only radar data is required and the englacial reflectors are automatically detected from the radar data itself. A final product of 3D attenuation rates and 3D samples count is provided for the research community in this data set.
Simple
Identification info
- Date (Creation)
- 2020-03-10
- Date (Publication)
- 2020-03-10
Point of contact
- Credit
- Australian Research Council’s Special Research Initiative for Antarctic Gateway Partnership (Project ID SR140300001)
- Credit
- Australian Antarctic Division (Project IDs 3103, 4077 and 4346)
- Status
- Completed
Point of contact
- Topic category
-
- Geoscientific information
Extent
))
Temporal extent
- Time period
- 2017-06-12 2020-01-01
Vertical element
- Minimum value
- -100
- Maximum value
- 1300
- Identifier
- EPSG::5714
- Maintenance and update frequency
- Not planned
- Keywords (Theme)
-
- attenuation
- ice penetrating radar
- Law Dome
- NASA/GCMD Keywords, Version 8.5
- Keywords (Theme)
-
- Attenuation rate
- Count samples
- easting
- northing
- altitude
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
- The data described in this record are the intellectual property of the University of Tasmania through the Institute for Marine and Antarctic Studies.
Resource constraints
- Linkage
-
http://i.creativecommons.org/l/by/4.0/88x31.png
License Graphic
- Title
- Creative Commons Attribution 4.0 International License
- Website
-
http://creativecommons.org/licenses/by/4.0/
License Text
- Other constraints
- The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).
- Language
- English
- Character encoding
- UTF8
- Supplemental Information
- A 3D map of englacial attenuation rate from radar reflections at Law Dome, East Antarctica, Abdul Salam, S., McCormack, FS., Roberts, JL., Coleman, R., Halpin, JA., Earth System Science Data (Submitted)
Content Information
- Content type
- Physical measurement
- Description
- Attenuation rates estimated and post processed to generated a 3D grid.
- Name
-
Attenuation rate
- Name
-
attenuation
- Name
- dB/km
- Description
- This is corresponding grid of the attenuation rates that how many samples are contributing to the each cell in the 3D grid.
- Name
-
Count samples
- Name
-
count
- Name
- samples
- Description
- Reference frame is polar stereographic with 71S as the latitude of true scale, 0E as the reference longitude.
- Name
-
easting
- Name
-
easting
- Name
- km
- Description
- Reference frame is polar stereographic with 71S as the latitude of true scale, 0E as the reference longitude.
- Name
-
northing
- Name
-
northing
- Name
- km
- Description
- Ice surface is zero and Z direction is UP which means negative values below the ice surface.
- Name
-
altitude
- Name
-
altitude
- Identifier
- http://vocab.nerc.ac.uk/collection/P06/current/ULAA
- Name
- Metres
Distribution Information
- Distribution format
-
-
NetCDF
-
NetCDF
- OnLine resource
-
DATA ACCESS - Attenuation rate [.nc direct download]
- OnLine resource
-
DATA ACCESS - Count of samples [.nc direct download]
Resource lineage
- Statement
- This attenuation rate data set is obtained by detecting internal reflectors and estimating attenuation within ice using radar data from Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP ) project (https://nsidc.org/data/IR1HI1B/versions/1 and https://nsidc.org/data/IR2HI1B/versions/1) at Law Dome, East Antarctica. The englacial layers are detected with a minimum 60 m spacing between the layers and the attenuation rate is estimated using a mathematical model of constrained optimization. After the estimation of the radar attenuation, the data is post-processed to enhance the quality of the data. In the post-processing step, a 3D grid of 1 km x 1km x 60 m dimension is developed. As the flight lines in the original data provide dense coverage so each grid cell contains many samples (the median is selected among these samples). A second 3D grid is also generated which contains the values that how many samples are contributing to the corresponding grid cell of attenuation rate.
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
-
01b862fd-6f8d-4d9a-8bd8-ad8567e498d9
- Language
- English
- Character encoding
- UTF8
Publisher
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/01b862fd-6f8d-4d9a-8bd8-ad8567e498d9
Point of truth URL of this metadata record
- Date info (Creation)
- 2020-04-22T08:42:20
- Date info (Revision)
- 2020-04-22T08:42:20
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
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