Fractionation of gases in polar ice during bubble close-off: firn air Ne, Kr and Xe observationsEntry ID: severinghaus_nsidc0290
Abstract: Gas ratios in air withdrawn from polar firn (snowpack) show systematic
enrichments of Ne/N2, O2/N2 and Ar/N2, in the firnice 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.
ISO Topic Category
Data Set Progress
Email: jseveringhaus at ucsd.edu
Scripps Institution of Oceanography 9500 Gilman Dr.
City: La Jolla
Province or State: CA
Postal Code: 92093-0244
Email: mbattle at bowdoin.edu
Dept. of Physics and Astronomy Bowdoin College 8800 College Station
Province or State: ME
Postal Code: 04011-8488
Phone: 609 258-2936
Fax: 609 258 0796
Email: bender at princeton.edu
Department of Geosciences Princeton University M48 Guyot Hall
Province or State: NJ
Postal Code: 08544
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.
Creation and Review Dates
DIF Creation Date: 2006-05-22
Last DIF Revision Date: 2009-01-08