Data Set ID:

Blue Ice Tephra II - Mt. DeWitt, Version 1

This data set is the result of a study of volcanic ash and rock fragment (tephra) layers in exposed blue ice areas on Mt. DeWitt, Antarctica (77.12 deg S, 159.51 deg E). Tephra samples were collected between 15 November 1996 and 15 January 1997.

Data include the following information for each sample site: a general description, electron microprobe analysis, GPS location, neutron activation analysis, and a visual description of the petrography. Data are provided as an Excel 97 data file, (this file is also divided into various text files) and TIF images. Data are available via ftp.

Antarctic ice sheets preserve a record of the volcanic ash layers and chemical aerosol signatures of local and distant volcanic eruptions. Correlation of individual tephra layers, or sets of layers, in blue ice areas will allow a better understanding of the geometry of ice flow in these areas. Tephra layers in deep ice cores can also provide unique time-stratigraphic markers in cores that are difficult to date.

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Geographic Coverage

Data Set Tabs

Temporal Coverage:
  • 1996-01-01 to 1997-12-31
Temporal Resolution:
Not specified
Spatial Coverage:
  • N: -77.12, S: -77.12, E: -159.51, W: -159.51

Spatial Resolution:
Not Specified
  • Ice Core Records
  • Glaciers/Ice Sheets > Ice Sheets
  • Ice Core Records > Volcanic Deposits
Data Format(s):
  • Microsoft Excel
  • TIFF
  • ASCII Text (.txt)
Data Contributor(s): Nelia Dunbar

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see Use and Copyright.

Dunbar, N. 2003. Blue Ice Tephra II - Mt. DeWitt, Version 1. [indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center.

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA