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Data Set ID:
NSIDC-0501

Modeled Radar Attenuation Rate Profile at the Vostok 5G Ice Core Site, Antarctica, Version 1

This data set provides a modeled radar attenuation rate profile, showing the predicted contributions from pure ice and impurities to radar attenuation at the Vostok 5G ice core site in Antarctica, as well as the total attenuation rate and its formal uncertainty. The model data are based on borehole temperature logs, concentrations of major soluble ions measured from melted ice core samples, and information about the electrical conductivity of ice. Attenuation rates and their spatial variability are important constraints for radar studies of ice sheets. Parameters include depth, total attenuation rate, and attenuation rate contribution from pure ice, acidity, and salinity.

Data are available via FTP as a text file (.txt) with columns in comma separated value format.

Geographic Coverage

Parameter(s):
  • Glaciers/Ice Sheets > Ice Sheets
  • Precipitation > Snow
Spatial Coverage:
  • N: -78.47, S: -78.47, E: 73.17, W: 73.17

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 January 2007 to 31 December 2008
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) FIELD INVESTIGATION, FIELD SURVEYS, MODELS
Sensor(s): ION CHROMATOGRAPHS, THERMOMETERS
Version: V1
Data Contributor(s): Joseph MacGregor, Kenichi Matsuoka, Michael Studinger
Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

MacGregor, J. A., K. Matsuoka, and M. S. Studinger. 2011. Modeled Radar Attenuation Rate Profile at the Vostok 5G Ice Core Site, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N59K485D. [Date Accessed].

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Detailed Data Description

Format

Data are in ASCII text format (.txt), with columns in comma separated value format.

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0501_macgregor_V01/ directory. The data set consists of one data file, vostok_atten.txt.

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File Size

The data file is 15 KB.

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Spatial Coverage

The model is based on borehole and ice core data from the Vostok 5G ice core.

Southernmost Latitude: 78.47°S 
Northernmost Latitude: 78.47°S
Westernmost Longitude: 73.17°E
Easternmost Longitude: 73.17°E

Spatial Resolution

10 m depth

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Temporal Coverage

Data used for the model were collected in 2007 and 2008.

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Parameter or Variable

These data consist of a modeled radar attenuation rate profile, based on data from the Vostok 5G ice core. Parameters include depth, total attenuation rate, and attenuation rate contribution from pure ice, acidity, and salinity. Attenuation rate is measured in decibels (dB) per kilometer.

Parameter Description

Table 1 describes the columns and parameters in the vostok_atten.txt file.

Table 1. Parameter Description
Column Number Description
1 Depth of Midpoint for interval (m)
2 Attenuation Rate Contribution from Pure Ice (dB/km)
3 Attenuation Rate Contribution from Acidity / H+ (dB/km)
4 Attenuation Rate Contribution from Salinity / Sea Salt Cl- (dB/km)
5 Total Attenuation Rate (dB/km)
6 Total Attenuation Rate Uncertainty (dB/km)

Sample Data Record

This table shows the first three records in the vostok_atten.txt file. The file has no 
header row: columns are listed at the top of the file, as well as under Parameter Description, directly above.

5

0.090974

0

0.01384

0.10481

0.14761

15

0.097435

0

0.015841

0.11328

0.17125

25

0.11442

0

0.019312

0.13373

0.20899

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Software and Tools

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Data Acquisition and Processing

Theory of Measurements

Radar attenuation rates are based on data from the Vostok 5G ice core, include borehole temperature logs, major soluble ion concentrations measured from melted ice core samples, combined with researchers' present understanding of the radio frequency electrical conductivity of ice. The radar attenuation rates were modeled following work by MacGregor, et. al., 2009 and 2007.

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References and Related Publications

Contacts and Acknowledgments

Dr. Joseph A. MacGregor
University of Texas at Austin
10100 Burnet Road, Bldg. 196
Austin, TX 78758
USA

Dr. Kenichi Matsuoka
Department of Earth and Space Sciences 
University of Washington 
Department of Earth and Space Sciences
Seattle, WA 98105
USA

Dr. Michael Studinger
Lamont-Doherty Earth Observatory
61 Route 9W
Palisades, NY 10964
USA

Acknowledgments: 

This research was supported by the National Science Foundation (NSF) Office of Polar Programs (OPP) grant number 0538674.

Document Information

Document Creation Date

24 August 2011

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