This data set is an analysis of methyl chloride concentration measured in air extracted from ice core samples from the Siple Dome A deep core in West Antarctica. In total, forty six (46) ice samples, approximately 10-15 cm in length, were analyzed in this study. Data are available in Microsoft Excel format and are available via FTP.
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Methyl Chloride Measurements from the Siple Dome A Deep Core, Antarctica, Version 1
Geographic Coverage
Spatial Coverage: |
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Spatial Resolution: | Not Specified |
Temporal Coverage: |
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Temporal Resolution: | Not specified |
Parameter(s): |
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Platform(s) | Not specified |
Sensor(s): | GAS CHROMATOGRAPHS |
Data Format(s): |
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Version: | V1 |
Data Contributor(s): | Eric Saltzman, Murat Aydin, Margaret Williams |
Metadata XML: | View Metadata Record |
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.
Saltzman, E., M. Aydin, and M. Williams. 2008. Methyl Chloride Measurements from the Siple Dome A Deep Core, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N56W9807. [Date Accessed].Detailed Data Description
Microsoft Excel format
Files are named according to the following convention:
SDMAMeCldata22Sep08.xls
Where SDMA = Siple Dome A Core
Where MeCl = methyl chloride
Approximately 31 kilobytes (KB)
Southernmost Latitude: 81.66 South
Northernmost Latitude: 81.66 South
Westernmost Longitude:148.82 West
Easternmost Longitude: 148.82 West
November 2004 to May 2007
Parameters include: Methyl chloride concentration (ppt)
Sample Data Record
The worksheet has 6 columns and 48 rows. Data reported to two decimal places for all columns except error measurements (in the last column) which are reported to one decimal place.
gas age (yr) | gas age (kyr) | Top depth (m) | Bottom depth (m) | MeCl (ppt) | error |
---|---|---|---|---|---|
130.00 | 0.13 | 61.27 | 61.47 | 630.00 | 4.7 |
259.00 | 0.26 | 75.88 | 76.08 | 577.00 | 6.4 |
342.00 | 0.34 | 84.91 | 85.11 | 471.90 | 5.4 |
387.00 | 0.39 | 90.19 | 90.39 | 532.50 | 6.3 |
490.00 | 0.49 | 100.14 | 100.34 | 512.50 | 5.6 |
785.62 | 0.79 | 130.36 | 130.56 | 646.05 | 11.7 |
1135.21 | 1.14 | 159.80 | 160.00 | 494.57 | 9.0 |
1481.22 | 1.48 | 189.80 | 190.00 | 590.05 | 9.2 |
1864.62 | 1.86 | 219.80 | 220.00 | 535.43 | 9.3 |
2268.04 | 2.27 | 249.80 | 250.00 | 496.28 | 18.9 |
Software and Tools
Data Acquisition and Processing
The air trapped in ice was released using a dry extraction method involving mechanical shredding of the ice core under vacuum. Gas samples were analyzed by gas chromatography with high resolution mass spectrometry and quantified using an isotope dilution method. Methyl chloride was measured in 46 ice core samples, unevenly spaced in time, with a bias toward the glacial/interglacial transition and Holocene.
Error Sources
Error measurements (in the last column of the worksheet) are reported to one decimal place.
Gas chromatograph.
References and Related Publications
Contacts and Acknowledgments
Eric Saltzman
3325 Croul Hall
Department of Earth System Science
University of California, Irvine
Irvine, California 92697 USA
Murat Aydin
3325 Croul Hall
Department of Earth System Science
University of California, Irvine
Irvine, California 92697 USA
Margaret Williams
NASA AMES Research Center
Moffett Field, California 94035-1000 USA
This research was supported by National Science Foundation (NSF) Office of Polar Programs (OPP) grant 0636953 awarded to E. Saltzman.
Document Information
Document Creation Date
October 2008
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