Methyl Chloride Measurements from the Siple Dome A Deep Core, Antarctica
Summary
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.
Citing These Data
The following example shows how to cite the use of this data set in a publication. For more information, see our Use and Copyright Web page.
Saltzman, Eric, Murat Aydin and Margaret Williams. 2008. Methyl Chloride Measurements from the Siple Dome A Deep Core, Antarctica. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N56W9807.
Overview Table
| Category | Description |
|---|---|
| Data format | Microsoft Excel format |
| Spatial coverage and resolution |
Southernmost Latitude: 81.66 South Northernmost Latitude: 81.66 South Westernmost Longitude: 148.82 West Easternmost Longitude: 148.82 West |
| Temporal coverage and resolution | November 2004 to May 2007 |
| File naming convention | SDMAMeCldata22Sep08.xls |
| File size | Approximately Megabytes (MB) |
| Parameter(s) | Methyl chloride concentration (ppt) |
| Procedures for obtaining data | Available via FTP |
Table of Contents
- Contacts and Acknowledgments
- Detailed Data Description
- Data Access and Tools
- Data Acquisition and Processing
- References and Related Publications
- Document Information
1. Contacts and Acknowledgments
Investigator(s)
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
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 National Science Foundation (NSF) Office of Polar Programs (OPP) grant 0636953 awarded to E. Saltzman.
2. Detailed Data Description
Format
Microsoft Excel format
File Naming Convention
Files are named according to the following convention:
SDMAMeCldata22Sep08.xls
Where SDMA = Siple Dome A Core
Where MeCl = methyl chloride
File Size
Approximately 31kilobytes
Spatial Coverage
Southernmost Latitude: 81.66 South
Northernmost Latitude: 81.66 South
Westernmost Longitude:148.82 West
Easternmost Longitude:
148.82 West
Temporal Coverage
November 2004 to May 2007
Parameter or Variable
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 |
Error Sources
Error measurements (in the last column of the worksheet) are reported to one decimal place.
3. Data Access and Tools
Data Access
Available via FTP
Volume
Approximately 31 kilobytes (KB)
Related Data Collections
- Antarctic Ice Cores: Methyl Chloride and Methyl Bromide
- Analysis of Siple Dome Ice Core: Carbonyl Sulfide (COS), Methyl Chloride (CH3Cl), and Methyl Bromide (CH3Br)
- Analysis of Siple Dome Ice Core Subsamples
4. Data Acquisition and Processing
Sensor or Instrument Description
gas chromatograph
Data Acquisition Methods
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.
5. References and Related Publications
Saltzman, E.S., M.Aydin, M.B. Williams, K.R. Verhulst, and B. Gun, Methyl chloride in a deep ice core from Siple Dome, West Antarctica, Geophys. Res. Lett., submitted.
6. Document Information
Acronyms
The following acronyms are used in this document.
| Acronym | Description |
|---|---|
| FTP | File Transfer Protocol |
| NSIDC | National Snow and Ice Data Center |
| KB | kilobytes |
| MeCl | methyl chloride |
| URL | Uniform Resource Locator |
Document Creation Date
October 2008
Document URL
http://nsidc.org/data/docs/agdc/nsidc0356_saltzman/index.html
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