Get Data

DOWNLOADING DATA VIA FTP

Data can be downloaded through a Web browser or command line via FTP. When using a Web browser, the FTP link first directs you to an Optional Registration Form that if filled out, will allow you to receive notifications about updates or processing changes related to that specific data set. After completing the Optional Registration Form, the FTP directory becomes available. For additional help downloading data through an FTP client, go to the How to access data using an FTP client support page.

FTP

Data Set ID:
NSIDC-0515

Annual Layers at Siple Dome, Antarctica, from Borehole Optical Stratigraphy, Version 1

Researchers gathered data on annual snow layers at Siple Dome, Antarctica, using borehole optical stratigraphy. This data set contains annual layer depths and firn optical brightness. The brightness log is a record of reflectivity of the firn, and peaks in brightness are interpreted to be fine-grained high-density winter snow, as part of the wind slab depth-hoar couplet.

Data are available via FTP in ASCII text (.txt) format

Geographic Coverage

Parameter(s):
  • Snow/Ice > Ice Depth/Thickness
  • Snow/Ice > Snow Depth
  • Snow/Ice
  • Snow/Ice > Snow Stratigraphy
Spatial Coverage:
  • N: -81.66, S: -81.66, E: -148.82, W: -148.82

Spatial Resolution: Not Specified
Temporal Coverage:
  • 15 December 2000 to 15 November 2001
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) FIELD INVESTIGATION
Sensor(s): CAMERAS
Version: V1
Data Contributor(s): Edwin Waddington, Robert Hawley, Richard Alley, Kendrick Taylor
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.

Waddington, E. D., R. L. Hawley, R. Alley, and K. C. Taylor. 2012. Annual Layers at Siple Dome, Antarctica, from Borehole Optical Stratigraphy, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5DB7ZRZ. [Date Accessed].

Back to Top

Collapse All / Open All

This data set contains optical brightness and depth data from the Siple Dome borehole in Antarctica, as well as layer depths derived from the brightness log. These data can provide insight into firn compaction and vertical motion of the ice sheet.

Detailed Data Description

Format

The data set is provided as two ASCII text (.txt) files.

Background color on
File and Directory Structure

The data set consists of two data files, layers.txt and BOS.txt. Data are on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0515_waddington_V01/ folder.

Background color on
File Size

Two data files are 12 KB to 467 KB.

Background color on
Volume

The entire data set is approximately 480 KB.

Background color on
Spatial Coverage

Siple Dome, Antarctica
Latitude: 81.66° S
Longitude: 148.82° W

Spatial Resolution

5 mm depth

Background color on
Temporal Coverage

15 December 2000 to 15 November 2010, Austral summer only

Temporal Resolution

Single measurement

Background color on
Parameter or Variable

This data set provides annual layer depths and firn optical brightness, as measured by Borehole Optical Stratigraphy (BOS). These data include both the optical brightness versus depth record from Siple Dome, and also the layer depths derived from the brightness log. The brightness log is a record of firn reflectivity, and peaks in brightness are interpreted to be fine-grained high-density winter snow, as part of the "wind slab depth-hoar couplet." For more details see Hawley, et. al., 2003.

Parameter Description

The data set consists of two files. Layer picks are provided as one single column in the layers.txt file. The file BOS.txt provides depth and brightness measurements made using Borehole Optical Stratigraphy (BOS), a method described in detail in Hawley, et. al., 2003.

Table 1. Parameter Description for the BOS.txt file
Parameter Description
Depth Depth in meters
Intensity Optical brightness, measured using the BOS method.
Background color on

Software and Tools

Software and Tools

Data are readable using standard spreadsheet software.

Background color on

Data Acquisition and Processing

Data Acquisition Methods

Data were collected using Borehole Optical Stratigraphy (BOS). BOS uses a downward looking video camera and post-processing software to create a log of brightness versus depth. The active light source on the camera returns from the borehole walls to the camera, which views the walls with a wide angle lens. Brightness is calculated by averaging the pixel values of an annulus of pixels around the borehole wall. For a detailed description of techniques, see Hawley, et. al., 2003 and Hawley, et. al., 2011.

Background color on

References and Related Publications

Contacts and Acknowledgments

Dr. Edwin D. Waddington
University of Washington 
Department of Earth and Space Sciences
Seattle, Washington 98195-1310
USA

Dr. Robert L. Hawley
Dartmouth College
Earth Sciences, HB 6105
Hanover, New Hampshire 13755
USA

Dr. Richard B. Alley
Department of Geosciences 
517 Deike Building 
University Park, Pennsylvania 16802 
USA

Dr. Ken C. Taylor
Desert Research Institute
Department of Geosciences 
Nevada System of Higher Education
2215 Raggio Parkway 
Reno, Nevada 89512
USA 

Acknowledgments: 

This research was supported by the National Science Foundation (NSF) Office of Polar Programs (OPP) grant number 0087521.

Document Information

Document Creation Date

April 4, 2012

No technical references available for this data set.
No FAQs or How Tos available for this data set.

Access complete Knowledge Base

Questions? Please contact:
NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org