Record Search Query: [Keyword='SOUTH POLE']
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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Abstract: Gas ratios in air withdrawn from polar firn (snowpack) show systematic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.
Related URL
Description: Publications, Contacts and associated links - Severinghaus Laboratory

Description: Recent Publications and research interests, Dr. M. Battle
Data Set Citation
Version: Not provided
Temporal Coverage
Start Date: 1970-01-01
Data Set Progress
Data Center
National Snow and Ice Data Center Supplemental Info
Data Center URL:

Data Center Personnel
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
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Phone: 858-822-2483
Fax: 858-822-3310
Email: jseveringhaus at
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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Creation and Review Dates
DIF Creation Date: 2006-05-22
Last DIF Revision Date: 2018-10-01

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