Results 1 to 10 of about 531 (138)
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.
Mary R Albert +2 more
exaly +3 more sources
Modeling enhanced firn densification due to strain softening [PDF]
The Cryosphere, 2022 In the accumulation zone of glaciers and ice sheets snow is transformed into glacial ice by firn densification. Classically, this process is assumed to solely depend on temperature and overburden pressure, which is controlled by the accumulation rate ...
F. M. Oraschewski +2 more
doaj +1 more source
Thermal conductivity of polar firn
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 +1 more source
The Community Firn Model (CFM) v1.0 [PDF]
Geoscientific Model Development, 2020 Models that simulate the evolution of polar firn are important for several applications in glaciology, including converting ice-sheet elevation change measurements to mass change and interpreting climate records in ice cores.
C. M. Stevens +8 more
doaj +1 more source
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 +6 more
doaj +1 more source
Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn
Journal of Glaciology, 2021 Earlier gas measurements of firn air (atmosphere in open pore channels) at polar sites have revealed the occurrence of gas fractionation phenomena during bubble close-off, in addition to well-known thermal and gravitational gas separation.
Hiroshi Ohno +2 more
doaj +1 more source
Antarctic Firn Characterization via Wideband Microwave Radiometry
Remote Sensing, 2022 Recent studies have demonstrated that wideband microwave radiometers provide significant potential for profiling important subsurface polar firn characteristics necessary to understand the dynamics of the cryosphere and predict future changes in ice and ...
Rahul Kar +4 more
doaj +1 more source
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 +6 more
doaj +1 more source
Impact of physical properties and accumulation rate on pore close-off in layered firn [PDF]
The Cryosphere, 2014 Investigations into the physical characteristics of deep firn near the lock-in zone through pore close-off are needed to improve understanding of ice core records of past atmospheric composition. Specifically, the permeability and microstructure profiles
S. A. Gregory, M. R. Albert, I. Baker
doaj +1 more source
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