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Multiple Isotope Analysis of Sulfate in the West Antarctic Ice Sheet Divide Ice Core

Summary

This data set contains measurements of multiple sulfur and oxygen isotopes from sulfates, from an ice core drilled at the West Antarctic Ice Sheet (WAIS) Divide site in 2005. The initial sulfate measurements, analyzed in 2008 from the 70 meter WAIS 2005A core, are 12 meter averages and span the pre-industrial to industrial transition, from the late 1700s to 2005. This data set is part of the West Antarctic Ice Sheet Divide Ice Core (WAISCORES) project.

Data are available via FTP in Microsoft Excel (.xlsx) format.

Citing These Data

We kindly request that you cite the use of this data set in a publication using the following citation example. 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, data set title, publisher: NSIDC, and digital media.

Thiemens, M. H. 2010. Multiple Isotope Analysis of Sulfate in the West Antarctic Ice Sheet Divide Ice Core. Boulder, Colorado, USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5BG2KXH.

Overview Table

Category Description
Data format Microsoft Excel spreadsheet (.xlsx)
Microsoft Word document (.docx)
Spatial coverage and resolution Southernmost Latitude: 78°55'S
Northernmost Latitude: 78°55'S
Westernmost Longitude: 114°13'W
Easternmost Longitude: 114°13'W
Temporal coverage and resolution Ice core was drilled in 2005.
Data were analyzed in 2008.
File naming convention WAISDataThiemens.xlsx
File size Files range in size from 16 KB to 142 KB.
Parameter(s) Sulfure Isotopes
Oxygen Isotopes
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. Mark H. Thiemens
University of California, San Diego
9500 Gilman Drive # 0356
La Jolla, CA 92093-0356
USA

Dr. Becky Alexander
University of Washington
408 ATG Building
Seattle, WA 98195-1640
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 the National Science Foundation (NSF) Office of Polar Programs (OPP) grant number 0538520.

2. Detailed Data Description

Format

Data are available in Microsoft Excel (.xlsx) format, along with a graph in Microsoft Word (.docx) format.

File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0479_thiemens_V01/ directory. The directory contains an Excel spreadsheet with sulfur and oxygen isotope data from the WAIS 2005A ice core. It also contains a readme file in ASCII text format.

File Size

Files range in size from 16 KB to 142 KB.

Spatial Coverage

These data are from the 70-meter WAIS 2005A ice core, drilled as part of the West Antarctic Ice Sheet Divide Ice Core (WAISCORES) project.

Southernmost Latitude: 78°55'S
Northernmost Latitude: 78°55'S
Westernmost Longitude: 114°13'W
Easternmost Longitude: 114°13'W

Spatial Resolution

12 meters or 10 to 15 meters.

Temporal Coverage

Oxygen and sulfur isotope measurements of the WAIS 2005A ice core were made in 2008 and span approximately 300 years.

Parameter or Variable

The data set contains measurements of sulfur and oxygen isotopes in sulfates. Table 2 lists the isotopes and ratios analyzed in this data set.

Sulfure isotope data are reported as δS(‰) = (((xS/32S)sample/(xS/32S)standard) - 1) x 1000, where x = 33, 34, or 36 and Canyon Diablo Triolite (CDT) is the standard. For more information on the isotopes measured in this data set, see Kunasek et. al., 2010.

Parameter List

Table 2. Parameters
Parameter Description
Sulfur Isotopes δ33S
δ34S
Δ33(.515)
δ36/34 S
Δ36/32 S
Δ36(1.91)
umoles SF6
sigma
Oxygen Isotopes δ17O
δ18O
Δ17O

 

Sample Data Record

SULFUR ISOTOPES
sample depth (m) years d 33S sigma d 34S sigma D33(.515) d 36/34 S sigma d 36/32 S D36(1.91) umoles SF6
 
WAIS 1S 0-12.16 1978-present 2.841 0.003 5.491 0.01 0.016 3.927 0.132 9.44 -1.08 6.2
WAIS 2S 12.16-21.16 19-51-1977 3.721 0.018 7.190 0.006 0.017 5.165 0.085 12.39 -1.39 4.7

 

OXYGEN ISOTOPES
ID depth years d17O d18O D17O
WAIS 1S         0--12.16 1978--present 7.180 9.240 2.38
WAIS 2S 12.16--21.16 1951-1977 10.91 16.71 2.22

3. Data Access and Tools

Data Access

Data are available via FTP.

Volume

Total volume of the data set is approximately 142 KB.

Software and Tools

Data are accessible using standard spreadsheet software.

Related Data Collections

4. Data Acquisition and Processing

Theory of Measurements

For more information on methods, see Kunasek et. al., 2010.

5. References and Related Publications

Kunasek, S. A., B. Alexander, E. J. Steig, E. D., Sofen, T. L. Jackson, M. H. Thiemens, J. R. McConnell, D. J. Gleason, and H. M. Amos. 2010. Sulfate Sources and Oxidation Chemistry Over the Past 230 Years from Sulfur and Oxygen Isotopes of Sulfate in a West Antarctic Ice Core. Journal of Geophysical Research, Vol. 115, D18313, doi:10.1029/2010JD013846.

The following related documents are available on NSIDC's Web site.

Table 3. Related Documents
Document Description URL
West Antarctic Ice Sheet Divide Ice Core Project Project Web site http://www.waisdivide.unh.edu/about/site.html
NSIDC WAISCORES Data Related data collections http://nsidc.org/data/waiscores/

6. Document Information

Acronyms

The following acronyms are used in this document.

Table 4. Acronyms and Abbreviations
Acronym Description
FTP File Transfer Protocol
NSIDC National Snow and Ice Data Center
URL Uniform Resource Locator
WAISCORES West Antarctic Ice Sheet Divide Ice Core

Document Creation Date

15 October 2010

Document URL

http://nsidc.org/data/docs/agdc/nsidc0479_thiemens/index.html