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Englacial Layers and Attenuation Rates across the Ross and Amundsen Sea Ice-Flow Divide (WAIS Divide), West Antarctica

Summary

This data set contains the results of a model study of spatial variations of ice temperature and subglacial conditions using available ice-penetrating radar data around a future deep ice coring site near the Ross and Amundsen flow divide of West Antarctic Ice Sheet. The model data are based on radar data collected by the Support Office of Aerogeophysical Research (SOAR) at the University of Texas, and the University of Washington, in 2000. The data include values for attenuation estimates for individual radar profiles.

Data are available via FTP in MATLAB (.mat) and Portable Document (.pdf) formats.

Citing These Data

The following example shows how to cite the use of this data set in a publication. For more information, see our Use and Copyright Web page.

The following example shows how to cite the use of this data set in a publication. List the principal investigators, year of data set release, publisher: NSIDC, and digital media.

Raymond, C. and K. Matsuoka. 2010. Englacial Layers and Attenuation Rates across the Ross and Amundsen Sea Ice-Flow Divide (WAIS Divide), West Antarctica. Boulder, Colorado, USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5416V0W.

Overview Table

Category Description
Data format MATLAB (.mat), and Portable Document Format (.pdf)
Spatial coverage and resolution Southernmost Latitude: 79.47°S
Northernmost Latitude: 79.47°S
Westernmost Longitude: 112.09°W
Easternmost Longitude: 112.09°W
Temporal coverage and resolution Data were collected and processed between 2004 and 2010.
File naming convention CC_X01a.mat
NW_X01a.mat
beds.mat
Note_WAISDivide_Attenuation.pdf

File size Files range in size from 12 KB to 1088 KB.
Parameter(s) Two-way travel time
Layer depth
Returned power from individual layers
Radar attenuation
Procedures for obtaining data Data are available via FTP.

Table of Contents

  1. Contacts and Acknowledgments
  2. Detailed Data Description
  3. Data Access and Tools
  4. Data Acquisition and Processing
  5. References and Related Publications
  6. Document Information

1. Contacts and Acknowledgments

Investigator(s)

Dr. Charles Raymond
University of Washington
Geophysics Program
Box 351650
Seattle, WA 98195
USA

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

Technical Contact

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

Acknowledgements

This research was supported by NSF OPP grant 0338151.

2. Detailed Data Description

Format

Data are available in MATLAB (.mat) format. Supporting information is available in Portable Document Format (.pdf).

File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0470_raymond_v01/ directory. Within this directory, there are 19 MATLAB (.mat) files, and two supporting documents in .pdf format.


File Naming Convention

Files are named according to the following convention and as described in Table 1:

DD_XNNa.mat

Where:

Table 1. File Naming Convention
Variable Description
DD Region name, corresponding to file names of the original SOAR radar profiles.
NW: Northwest
SE: Southeast
CC: Central
XNN Number corresponding to a radar track in each region. The radar tracks are identified in Figure 1 of the Note_WAISDivide_SOAR_layers.pdf file.
a Profile ID, corresponding to the original SOAR radar profiles.
.mat MATLAB file extension

Example: CC_X01a.mat: This file contains information corresponding to the central region, radar track X01, profile ID a. Further description of the radar tracks and profile IDs is available in the Note_WAISDivide_SOAR_layers.pdf file.

File Size

Files range in size from 12 KB to 1088 KB.

Spatial Coverage

West Antarctic Ice Sheet (WAIS) Divide:

Southernmost Latitude: 79.47°S
Northernmost Latitude: 79.47°S
Westernmost Longitude: 112.09°W
Easternmost Longitude: 112.09°W

Temporal Coverage

Data were collected and processed between 2004 and 2010. The original SOAR radar data were collected in 1997 to 2001.These data are available from the University of Texas Institute of Geophysics: http://www.ig.utexas.edu/research/facilities/aero/data/.

Parameter or Variable

The file Note_WAISDivide_Attenuation.pdf provides the estimated attenuation rates, along with a detailed description of the methods used to estimate attenuation rates. Parameters include two-way travel time, layer depth, returned power from individual layers, and radar attenuation. The MATLAB files use two-way-travel times and echo power strength to estimate englacial radar attenuation.

3. Data Access and Tools

Data Access

Data are available via FTP.

Volume

Total volume of the data set is approximately 3000 KB.

Software and Tools

The attenuation rate data are accessible using standard document viewing software. To access the MATLAB (.mat) models, MATLAB software is required.

Related Data Collections

4. Data Acquisition and Processing

Detailed descriptions of the models, radar profiles, and data results, are provided in the Note_WAISDivide_Attenuation.pdf and Note_WAISDivide_Attenuation.pdf files.

5. References and Related Publications

Laird, C. M., W. A. Blake, K. Matsuoka, H. Conway, C. T. Allen, C. J. Leuschen and S. Gogineni. 2010. Deep ice stratigraphy and basal conditions in central West Antarctica revealed by coherent radar. IEEE Geoscience and Remote Sensing Letters, v.7 (2), p. 246.

Matsuoka, K., A. Gades, H. Conway, G. Catania, and C. F. Raymond. 2009. Radar signatures beneath a surface topographic lineation near the outlet of Kamb Ice Stream and Engelhardt Ice Ridge, West Antarctica, Annals of Glaciology, v.50 (51), p. 93.

Matsuoka, K., D. Morse, et. al. 2010. Estimating Englacial Radar Attenuation Using Depth Profiles of the Returned Power, Central West Antarctica. Journal of Geophysical Research, Earth Surface, 115: F0212, doi:10.1029/2009JF001496.

MacGregor, J. D., P. Winebrenner, H. Conway, K. Matsuoka, P. A. Mayewski, and G. D. Clow. 2007. Modeling englacial radar attenuation at Siple Dome, West Antarctica, using ice chemistry and temperature data, Journal of Geophysical Research, v.112, p. F03008.

Table 3 list related documents that are available

Table 2. Related Documents
Document Description URL
University of Texas Institute for Geophysics: Cryospheric Data Data dissemination from the University of Texas http://www.ig.utexas.edu/research/facilities/aero/data/
Mathworks Software: MATLAB MATLAB software Web site http://www.mathworks.com/products/matlab/

6. Document Information

Acronyms

The acronyms used in this document are listed in Table 3.

Table 3. Acronyms and Abbreviations
Acronym Description
FTP File Transfer Protocol
NSIDC National Snow and Ice Data Center
URL Uniform Resource Locator

Document Creation Date

28 June 2010

Document URL

http://nsidc.org/data/docs/agdc/nsidc0470_raymond/index.html