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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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We find that argon/nitrogen ratios of trapped air in the GISP2 ice core on “gas ages” are significantly negatively correlated with accumulation rate changes over the past 6000 years. Lines of evidence indicate that changes in overloading pressure at bubble closeoff depths induced the gas fractionation in closed bubbles. Further understanding of the fractionation processes may lead to a new proxy for the past temperature and accumulation rate.
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Articles | Volume 15, issue 24
Atmos. Chem. Phys., 15, 13895–13914, 2015
https://doi.org/10.5194/acp-15-13895-2015
Atmos. Chem. Phys., 15, 13895–13914, 2015
https://doi.org/10.5194/acp-15-13895-2015

Research article 16 Dec 2015

Research article | 16 Dec 2015

Post-bubble close-off fractionation of gases in polar firn and ice cores: effects of accumulation rate on permeation through overloading pressure

T. Kobashi et al.

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Short summary
We find that argon/nitrogen ratios of trapped air in the GISP2 ice core on “gas ages” are significantly negatively correlated with accumulation rate changes over the past 6000 years. Lines of evidence indicate that changes in overloading pressure at bubble closeoff depths induced the gas fractionation in closed bubbles. Further understanding of the fractionation processes may lead to a new proxy for the past temperature and accumulation rate.
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