A new multi-gas constrained model of trace gas non-homogeneous transport in firn: evaluation and behaviour at eleven polar sites [PDF]
Atmospheric Chemistry and Physics, 2012 Insoluble trace gases are trapped in polar ice at the firn-ice transition, at approximately 50 to 100 m below the surface, depending primarily on the site temperature and snow accumulation.
E. Witrant +10 more
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Seismic observations of a complex firn structure across the Amery Ice Shelf, East Antarctica
Journal of Glaciology, 2021 We use seismic refraction data to investigate the firn structure across a suture zone on the Amery Ice Shelf, East Antarctica, and the possible role of glacier dynamics in firn evolution.
Hannes Hollmann +4 more
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The impact of ice layers on gas transport through firn at the North Greenland Eemian Ice Drilling (NEEM) site, Greenland [PDF]
The Cryosphere, 2014 Typically, gas transport through firn is modeled in the context of an idealized firn column. However, in natural firn, imperfections are present, which can alter transport dynamics and therefore reduce the accuracy of reconstructed climate records.
K. Keegan, M. R. Albert, I. Baker
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Ambient high-frequency seismic surface waves in the firn column of central west Antarctica
Journal of Glaciology, 2022 Firn is the pervasive surface material across Antarctica, and its structures reflect its formation and history in response to environmental perturbations.
Julien Chaput +3 more
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Frontiers in Earth Science, 2020 Interpretation of greenhouse gas records in polar ice cores requires a good understanding of the mechanisms controlling gas trapping in polar ice, and therefore of the processes of densification and pore closure in firn (compacted snow).
Kévin Fourteau +3 more
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Dispersion in deep polar firn driven by synoptic-scale surface pressure variability [PDF]
The Cryosphere, 2016 Commonly, three mechanisms of firn air transport are distinguished: molecular diffusion, advection, and near-surface convective mixing. Here we identify and describe a fourth mechanism, namely dispersion driven by synoptic-scale surface pressure ...
C. Buizert, J. P. Severinghaus
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Observations of the creep of polar firn
Journal of Glaciology, 2022 Constant-load creep tests were performed at −10°C at various compressive stresses from 0.05 to 0.75 MPa on specimens taken every 10 m along a firn core extracted at Summit, Greenland in June 2017.
Yuan Li, Ian Baker
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Gas isotope thermometry in the South Pole and Dome Fuji ice cores provides evidence for seasonal rectification of ice core gas records [PDF]
The Cryosphere, 2022 Gas isotope thermometry using the isotopes of molecular nitrogen and argon has been used extensively to reconstruct past surface temperature change from Greenland ice cores. The gas isotope ratios δ15N and δ40Ar in the ice core are each set by the amount
J. D. Morgan +7 more
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The Onset of Recrystallization in Polar Firn
Geophysical Research Letters, 2023 Constraining the onset of dynamic recrystallization (DRX) and its effects on the mechanical properties of firn is crucial for firn densification modeling.
Ayobami Ogunmolasuyi +2 more
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Frontiers in Earth Science, 2021 The occurrence of snowpack features has been used in the past to classify environmental regimes on the polar ice sheets. Among these features are thin crusts with high density, which contribute to firn stratigraphy and can have significant impact on firn
Alexander H. Weinhart +5 more
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