Results 11 to 20 of about 28,822 (198)

Firn on ice sheets [PDF]

Nature Reviews Earth and Environment
Most of the Greenland and Antarctic ice sheets are covered with firn — the transitional material between snow and glacial ice. Firn is vital for understanding ice-sheet mass balance and hydrology, and palaeoclimate. In this Review, we synthesize knowledge of firn, including its formation, observation, modelling and relevance to ice sheets.
Amory, Charles, Buizert, Christo, Buzzard, Sammie, Clerx, Nicole, Culberg, Riley, Dey, Rahul, Drews, Reinhard, Dunmire, Devon, Eayrs, Clare, Hansen, Nicolaj, Humbert, Angelika, Kaitheri, Athul, Keegan, Kaitlin, Kuipers Munneke, Peter, Lhermitte, Stef, Mair, Doug, McDowell, Ian, Mejia, Jessica, Meyer, Colin R., Morris, Elizabeth, Moser, Dorothea, Oraschewski, Falk M., Pearce, Emma, Schlegel, Nicole Jeanne, Schultz, Timm, Simonsen, Sebastian B., Stevens, C. Max, Thomas, Elizabeth R., Thompson-Munson, Megan, Wever, Nander, Case, Elizabeth   +30 more
exaly   +12 more sources

Stratigraphic Analysis of Firn Cores from an Antarctic Ice Shelf Firn Aquifer [PDF]

Water, 2021
In recent decades, several large ice shelves in the Antarctic Peninsula region have experienced significant ice loss, likely driven by a combination of oceanic, atmospheric and hydrological processes. All three areas need further research, however, in the case of the role of liquid water the first concern is to address the paucity of field measurements.
Shelley MacDonell, Francisco Fernandoy, Paula Villar, Arno Hammann   +3 more
openaire   +4 more sources

Microstructural characterization of snow, firn and ice [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2019
This paper provides an overview of techniques used to characterize the microstructure of snow, firn and ice. These range from traditional optical microscopy techniques such as examining thin sections between crossed polarizers to various electron-optical and X-ray techniques.
Ian Baker
openaire   +4 more sources

Modelling of the densification of polar firn: characterization of the snow–firn transition [PDF]

Annals of Glaciology, 1998
The transformation of dry snow to firn is described by the transition between densification by deformationless restacking and densification by power-law creep. The observed decrease with temperature of the density at the snow-firn transition seems to result from the competition between grain-boundary sliding and power-law creep. These two densification
Arnaud, Laurent, Lipenkov, Volodya, Barnola, Jean-Marc, Gay, Michel, Duval, Paul   +4 more
openaire   +3 more sources

Improved representation of the contemporary Greenland ice sheet firn layer by IMAU-FDM v1.2G [PDF]

Geoscientific Model Development, 2022
The firn layer that covers 90 % of the Greenland ice sheet (GrIS) plays an important role in determining the response of the ice sheet to climate change.
M. Brils, P. Kuipers Munneke, W. J. van de Berg, M. van den Broeke   +3 more
doaj   +1 more source

The singing firn

Annals of Glaciology, 2022
AbstractAntarctic firn presents an exotic seismological environment in which the behaviors of propagating waves can be significantly at odds with those in other Earth media. We present a condensed view of the nascent field of ambient noise seismology in Antarctic firn-covered media, and highlight multiple unusual and information-rich observations ...
Julien Chaput, Richard C. Aster, Marianne Karplus   +2 more
openaire   +2 more sources

A new model of dry firn-densification constrained by continuous strain measurements near South Pole

Journal of Glaciology, 2023
Converting measurements of ice-sheet surface elevation change to mass change requires measurements of accumulation and knowledge of the evolution of the density profile in the firn.
C. Max Stevens, David A. Lilien, Howard Conway, T. J. Fudge, Michelle R. Koutnik, Edwin D. Waddington   +5 more
doaj   +1 more source

More Realistic Intermediate Depth Dry Firn Densification in the Energy Exascale Earth System Model (E3SM)

Journal of Advances in Modeling Earth Systems, 2022
Earth system models account for seasonal snow cover, but many do not accommodate the deeper snowpack on ice sheets (aka firn) that slowly transforms to ice under accumulating snowfall.
Adam M. Schneider, Charles S. Zender, Stephen F. Price   +2 more
doaj   +1 more source

Gravitational Separation in Polar Firn [PDF]

Science, 1993
H.L. Craig
openaire   +4 more sources

Local Weather Conditions Create Structural Differences between Shallow Firn Columns at Summit, Greenland and WAIS Divide, Antarctica

Atmosphere, 2020
Understanding how physical characteristics of polar firn vary with depth assists in interpreting paleoclimate records and predicting meltwater infiltration and storage in the firn column.
Ian E. McDowell, Mary R. Albert, Stephanie A. Lieblappen, Kaitlin M. Keegan   +3 more
doaj   +1 more source