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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

  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)

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

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.

Acronyms and Abbreviations
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