Composition of firn air at the North Greenland Ice Core Project (NGRIP) site [PDF]
, 2021 Reconstructions of the past variations of atmospheric composition are important for better understanding of the changes in climate and atmospheric chemistry.
core
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
Modelling L-band microwave brightness temperature time series for firn aquifers [PDF]
The CryosphereFirn aquifers are important in polar ice sheet hydrology and the associated mass and energy transport processes. Although the firn aquifer extent has been mapped using passive microwave satellite observations, models for predicting the L-band brightness ...
H. Xu +4 more
doaj +1 more source
Gas diffusivity and permeability through the firn column at Summit, Greenland: measurements and comparison to microstructural properties [PDF]
The Cryosphere, 2014 The physical structure of polar firn plays a key role in the mechanisms by which glaciers and ice sheets preserve a natural archive of past atmospheric composition. This study presents the first measurements of gas diffusivity and permeability along with
A. C. Adolph, M. R. Albert
doaj +1 more source
Investigations of meltwater refreezing and density variations in the snowpack and firn within the percolation zone of the Greenland ice sheet [PDF]
, 2007 The mass balance of polythermal ice masses is critically dependent on the proportion of surface-generated meltwater that subsequently refreezes in the snowpack and firn.
Nienow, Peter +12 more
core +1 more source
Pore morphology of polar firn around closure revealed by X-ray tomography [PDF]
The Cryosphere, 2018 Understanding the slow densification process of polar firn into ice is essential in order to constrain the age difference between the ice matrix and entrapped gases.
A. Burr +7 more
doaj +1 more source
BUBBLE VOLUMES IN FIRN-ICE TRANSITION LAYER OF ICE CORES FROM POLAR ICE SHEETS [PDF]
, 1994 P(論文)The air bubble formation process has been studied experimentally by using five ice cores from the Greenland and Antarctic ice sheets. Bubble volumes in firn-ice samples were measured by a classical method based on the Boyle-Charles law for an ideal ...
カメダ, タカオ +3 more
core +1 more source
Annals of Glaciology, 2019 We compared elastic moduli in polar firn derived from diving wave refraction seismic velocity analysis, firn-core density measurements and microstructure modelling based on firn-core data.
Rebecca Schlegel +8 more
doaj +1 more source
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification
Journal of Glaciology, 2022 This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2).
Elizabeth M. Morris +2 more
doaj +1 more source