Articles | Volume 15, issue 12
The Cryosphere, 15, 5529–5555, 2021
https://doi.org/10.5194/tc-15-5529-2021
The Cryosphere, 15, 5529–5555, 2021
https://doi.org/10.5194/tc-15-5529-2021
Research article
10 Dec 2021
Research article | 10 Dec 2021

Fractionation of O2∕N2 and Ar∕N2 in the Antarctic ice sheet during bubble formation and bubble–clathrate hydrate transition from precise gas measurements of the Dome Fuji ice core

Ikumi Oyabu et al.

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Short summary
We present O2/N2 and Ar/N2 records from the Dome Fuji ice core through the bubbly ice, bubble–clathrate transition, and clathrate ice zones without gas-loss fractionation. The insolation signal is preserved through the clathrate formation. The relationship between Ar/Ν2 and Ο22 suggests that the fractionation for the bubble–clathrate transition is mass independent, while the bubble close-off process involves a combination of mass-independent and mass-dependent fractionation for O2 and Ar.