[Keyword='ice cores']
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Fractionation of gases in polar ice during bubble close-off: firn air Ne, Kr and Xe observations
Entry ID:
severinghaus_nsidc0290
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Gas ratios in air withdrawn from polar firn (snowpack) show systematic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.
Related URL
Location Keywords
Science Keywords
ISO Topic Category
Instrument
Ancillary Keywords
Data Set Progress
IN WORK
Originating Center
Data Center
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
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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