Results 21 to 30 of about 314,168 (203)
Porosity dependence of elastic moduli of snow and firn
Journal of Glaciology, 2021 Measurements of elastic wave velocities enable non-destructive estimation of the mechanical properties, elastic moduli and density of snow and firn.
Colin M. Sayers
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Polar Firn Densification and Grain Growth [PDF]
Annals of Glaciology, 1982 A 50 m firn core from Dome C, East Antarctica, was found to consist of coarse firn, which comprised 90 to 95% of the core, and fine firn. Coarse firn was characterized by large crystals with a vertical shape orientation near the surface, connected to nearest neighbors by relatively large necks in a structure different from closest packing.
Richard B. Alley +2 more
openaire +1 more source
Crystal growth rates in polar firn [PDF]
Annals of Glaciology, 1993 Continuous crystal-size measurements made on the G6 Antarctic ice core (100m deep) show enhanced growth rates above a depth of 30 m (Zone 1) and in the interval between 70 and 80 m (Zone 2). Crystal growth in Zone 1 most probably takes place by a process of sublimation and condensation.
Hitoshi Shoji +3 more
openaire +1 more source
, 2022 Among his varied Resistance activities during the Nazi occupation of Norway, Tore Gjelsvik co-edited an underground newspaper called Bulletinen (The Bulletin).
Helle V. Goldman, Goldman, Helle V.
core +1 more source
Bidirectional permeability measurements of polar firn [PDF]
Annals of Glaciology, 2002 AbstractIce cores provide a valuable archive of climate history. for a complete understanding of this archive, it is important to understand air–snow exchange processes through the snow and firn in order to fully decode the ice-core record. Transport processes through the snow and firn are dependent upon their physical properties.
Gina L. Luciano, Mary R. Albert
openaire +1 more source
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
doaj +1 more source