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Data Set ID:
NSIDC-0479

Multiple Isotope Analysis of Sulfate in the West Antarctic Ice Sheet Divide Ice Core, Version 1

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.

Geographic Coverage

Spatial Coverage:
  • N: -78.916667, S: -78.916667, E: -114.216667, W: -114.216667

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 January 2005 to 31 December 2005
Temporal Resolution: Not specified
Parameter(s):
  • Ice Core Records
  • Ice Core Records > Isotopes
  • Atmospheric Chemistry > Sulfur Compounds > Sulfate
Platform(s) LABORATORY
Sensor(s): MASS SPECTROMETERS
Data Format(s):
  • Microsoft Excel
Version: V1
Data Contributor(s): Mark Thiemens

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.

Thiemens, M. H. 2010. Multiple Isotope Analysis of Sulfate in the West Antarctic Ice Sheet Divide Ice Core, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5BG2KXH. [Date Accessed].

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Detailed Data Description

Format

Data are available in Microsoft Excel (.xlsx) 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/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.

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File Size

Files range in size from 16 KB to 142 KB.

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Volume

Total volume of the data set is approximately 142 KB.

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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.

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Temporal Coverage

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

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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
 
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Software and Tools

Data are accessible using standard spreadsheet software.

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Data Acquisition and Processing

Theory of Measurements

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

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References and Related Publications

Contacts and Acknowledgments

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

Acknowledgements: 

This research was supported by the National Science Foundation (NSF) Office of Polar Programs (OPP) grant number 0538520.

Document Information

Document Creation Date

15 October 2010

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