Results 1 to 10 of about 7,920 (204)

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
doaj   +3 more sources

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, Andrii Murdza, Ian Baker   +2 more
doaj   +3 more sources

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, L. Arnaud, X. Faïn, P. Martinerie, D. M. Etheridge, V. Lipenkov, J.-M. Barnola   +6 more
doaj   +7 more sources

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
doaj   +3 more sources

Observations of creep of polar firn at different temperatures [PDF]

The Cryosphere
To 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
doaj   +4 more sources

Trends of halon gases in polar firn air: implications for their emission distributions [PDF]

Atmospheric Chemistry and Physics, 2005
Four halons (H-1301, H-1211, H-2402 and H-1202) have been measured in air samples collected from polar firn from Dome Concordia (Dome C), Antarctica, from Devon Island, Canada and the North Greenland Ice Core Project (NGRIP) site, Greenland. H-2402 and H-
C. E. Reeves, W. T. Sturges, G. A. Sturrock, K. Preston, D. E. Oram, J. Schwander, R. Mulvaney, J.-M. Barnola, J. Chappellaz   +8 more
doaj   +6 more sources

Direct and Inverse Problem for Gas Diffusion in Polar Firn [PDF]

Communications on Analysis and Computation, 2022
41 pages, 18 ...
Sophie Moufawad, Nabil Nassif, Faouzi Triki   +2 more
openalex   +5 more sources

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, P. Martinerie, C. Hogan, J. C. Laube, K. Kawamura, E. Capron, S. A. Montzka, E. J. Dlugokencky, D. Etheridge, T. Blunier, W. T. Sturges   +10 more
doaj   +6 more sources

Response : Gravitational Separation in Polar Firn [PDF]

Science, 1993
International ...
Dominique Raynaud, J. M. Banola, J. Chappellaz, R. J. Delmas, C. Lorius, J. Jouzel, Jakob Schwander   +6 more
  +6 more sources

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, B. Medley, L. Tsang, J. T. Johnson, K. C. Jezek, M. Brogioni, L. Kaleschke   +6 more
doaj   +2 more sources