Fractionation of gases in polar ice during bubble close-off: firn air Ne, Kr and Xe observations
Entry ID: severinghaus_nsidc0290

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Summary
Abstract: Gas ratios in air withdrawn from polar firn (snowpack) show systematic
enrichments of Ne/N2, O2/N2 and Ar/N2, in the firn–ice transition region where
bubbles are closing off. Air from the bubbles in polar ice is correspondingly
depleted in these ratios, after accounting for gravitational effects. Gas in
the bubbles becomes fractionated during the process of bubble close-off and
fractionation may continue as ice cores are stored prior to analysis.

These findings have implications for ice core and firn air studies that use gas
ratios to infer paleotemperature, chronology and past atmospheric composition.
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Description: Publications, Contacts and associated links - Severinghaus Laboratory
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Data Set Progress
IN WORK
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National Snow and Ice Data Center Supplemental Info
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
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Personnel
Role: INVESTIGATOR
Phone: 858-822-2483
Fax: 858-822-3310
Email: jseveringhaus at ucsd.edu
Contact Address:
Scripps Institution of Oceanography
9500 Gilman Dr.
City: La Jolla
Province or State: CA
Postal Code: 92093-0244
Country: USA
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Publications/References
Severinghaus, J.P., and Battle, M., Fractionation of gases in polar ice during
bubble close-off: new constraints from firn air Ne, Kr, and Xe observations,
Earth Planet Sci. Lett. 244, 474-500 (2006). doi: 10.1016/j.epsl.2006.01.032.

http://icebubbles.ucsd.edu/Closeoff_EPSL.pdf
Creation and Review Dates
DIF Creation Date: 2006-05-22
Last DIF Revision Date: 2009-01-08
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