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

Kobashi, T.; Ikeda-Fukazawa, T.; Suwa, M.; Schwander, J.; Kameda, T.; Lundin, J.; Hori, A.; Motoyama, H.; Döring, M.; Leuenberger, M.

doi:https://doi.org/10.5194/acp-15-13895-2015

Articles | Volume 15, issue 24

https://doi.org/10.5194/acp-15-13895-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-13895-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 24

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, T. Ikeda-Fukazawa, M. Suwa, J. Schwander, T. Kameda, J. Lundin, A. Hori, H. Motoyama, M. Döring, and M. Leuenberger

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Latest update: 07 Nov 2025

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.