Results 1 to 10 of about 776 (180)
Thermal conductivity of polar firn [PDF]
Journal of Glaciology, 2022 The vast Greenland and Antarctic Ice Sheets are covered by many tens of meters of polar firn, which is snow that is years to centuries old and has experienced significant metamorphism. Both ice-sheet modeling and decoding satellite data require knowledge
Simon E. Oster, Mary R. Albert
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The Onset of Recrystallization in Polar Firn [PDF]
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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Historical porosity data in polar firn [PDF]
Earth System Science Data, 2020 In the 1990s, closed and open porosity volumes of firn samples were measured by J.-M. Barnola using the technique of gas pycnometry, on firn from three different polar sites.
K. Fourteau +6 more
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Observations of the creep of polar firn [PDF]
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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Evidence of dynamic recrystallization in polar firn [PDF]
Journal of Geophysical Research, 2009 Microstructural analyses have been performed on polar firn from the European Project for Ice Coring in Antarctica drilling site in Dronning Maud Land, Antarctica. The results derived from images of the firn structure in microscopic resolution indicate that dynamic recrystallization is active in firn at all depths, and it dominates the evolution of the ...
Sepp Kipfstuhl +2 more
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Observations of creep of polar firn at different temperatures [PDF]
The CryosphereTo improve our understanding of firn compaction and deformation processes, constant-load compressive creep tests were performed on specimens from a Summit, Greenland (72°35′ N, 38°25′ W) firn core that was extracted in June 2017.
Y. Li, Y. Li, K. Keegan, I. Baker
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Direct and Inverse Problem for Gas Diffusion in Polar Firn [PDF]
Communications on Analysis and Computation, 2022 41 pages, 18 ...
Sophie Moufawad +2 more
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On the impact of impurities on the densification of polar firn [PDF]
Earth and Planetary Science Letters, 2012 Understanding polar firn densification is crucial for reconstructing the age of greenhouse gas concentrations extracted from ice cores, and for the interpretation of air in ice as a dating tool or as a climate proxy. Firn densification is generally modeled as a steady burial and sintering process of defined layers, where the structure of the layering ...
Thomas Laepple +2 more
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Polar firn properties in Greenland and Antarctica and related effects on microwave brightness temperatures [PDF]
The Cryosphere, 2023 In studying the mass balance of polar ice sheets, fluctuations in firn density near the surface is a major uncertainty. In this paper, we explore these variations at locations on the Greenland Ice Sheet and at the Dome C location in Antarctica.
H. Xu +6 more
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Concerning the Deposition and Diagenesis of Strata in Polar Firn [PDF]
Journal of Glaciology, 1988 Abstract Depth hoar in polar firn forms when large temperature gradients act on low-density firn, but high-density firn does not develop into depth hoar. Low densities in firn may be depositional (burial of surface hoar or still-air snowfall) or diagenetic (mass loss to the free atmosphere, typically in autumn); however, diagenesis is
Richard B. Alley
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