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
Kinematic waves in polar firn stratigraphy [PDF]
Journal of Glaciology, 2011 AbstractRadar studies of firn on the ice sheets have revealed complex folds on its internal layering that form from the interplay of snow accumulation and ice flow. A mathematical theory for these fold structures is presented, for the case where the radar cross section lies along the ice-flow direction and where the accumulation rate and ice-flow ...
Ng, F., King, E.C.
openaire +4 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 +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
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
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
doaj +1 more source
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
doaj +1 more source