Results 21 to 30 of about 1,003 (174)

Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series [PDF]

The Cryosphere, 2016
The snow microstructure, i.e., the spatial distribution of ice and pores, generally shows an anisotropy which is driven by gravity and temperature gradients and commonly determined from stereology or computer tomography.
S. Leinss, H. Löwe, M. Proksch, J. Lemmetyinen, A. Wiesmann, I. Hajnsek   +5 more
doaj   +1 more source

Microstructure-based modeling of snow mechanics: a discrete element approach [PDF]

The Cryosphere, 2015
Rapid and large deformations of snow are mainly controlled by grain rearrangements, which occur through the failure of cohesive bonds and the creation of new contacts. We exploit a granular description of snow to develop a discrete element model based on
P. Hagenmuller, G. Chambon, M. Naaim
doaj   +1 more source

Sodankylä manual snow survey program [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2016
The manual snow survey program of the Arctic Research Centre of the Finnish Meteorological Institute (FMI-ARC) consists of numerous observations of natural seasonal taiga snowpack in Sodankylä, northern Finland.
L. Leppänen, A. Kontu, H.-R. Hannula, H. Sjöblom, J. Pulliainen   +4 more
doaj   +1 more source

Enhancing simulations of snowpack properties in land surface models with the Soil, Vegetation and Snow scheme v2.0 (SVS2) [PDF]

Geoscientific Model Development
Snow microstructure – characterized by density, grain size, grain shape and arrangement – fundamentally determines snowpack macroscopic properties.
V. Vionnet, N. R. Leroux, V. Fortin, M. Abrahamowicz, G. Woolley, G. Mazzotti, M. Gaillard, M. Gaillard, M. Lafaysse, A. Royer, F. Domine, N. Gauthier, N. Rutter, C. Derksen, S. Bélair   +14 more
doaj   +1 more source

Early-stage interaction between settlement and temperature-gradient metamorphism

Journal of Glaciology, 2017
Snow metamorphism and settlement change the microstructure of a snowpack simultaneously. Past experiments investigated snow deformation under isothermal conditions. In nature, temperature gradient metamorphism and settlement often occur together.
MAREIKE WIESE, MARTIN SCHNEEBELI
doaj   +1 more source

Snowbreeder 5: a Micro-CT device for measuring the snow-microstructure evolution under the simultaneous influence of a temperature gradient and compaction

Journal of Glaciology, 2017
The instrumented sample holder Snowbreeder 5 is used to investigate the simultaneous influence of settlement on temperature-gradient snow metamorphism in time-lapse micro-computed tomography experiments.
MAREIKE WIESE, MARTIN SCHNEEBELI
doaj   +1 more source

A general treatment of snow microstructure exemplified by an improved relation for thermal conductivity [PDF]

The Cryosphere, 2013
Finding relevant microstructural parameters beyond density is a longstanding problem which hinders the formulation of accurate parameterizations of physical properties of snow.
H. Löwe, F. Riche, M. Schneebeli
doaj   +1 more source

Using Ultrasonic Waves to Determine the Microstructure of Snow

Frontiers in Earth Science, 2020
Acoustic signals interact with the physical structure of porous media, are particularly sensitive to porosity and tortuosity, and can be used to measure physical properties in a non-destructive manner. Given the fragile nature of freshly fallen snow, non-contact, non-destructive characterization methods made possible via acoustic signals, are desirable.
Ross Lieblappen, Ross Lieblappen, John M. Fegyveresi, John M. Fegyveresi, Zoe Courville, Donald G. Albert   +5 more
openaire   +2 more sources

Review article: Global monitoring of snow water equivalent using high-frequency radar remote sensing [PDF]

The Cryosphere, 2022
Seasonal snow cover is the largest single component of the cryosphere in areal extent, covering an average of 46 × 106 km2 of Earth's surface (31 % of the land area) each year, and is thus an important expression and driver of the Earth's climate.
L. Tsang, M. Durand, C. Derksen, A. P. Barros, D.-H. Kang, H. Lievens, H.-P. Marshall, J. Zhu, J. Johnson, J. King, J. Lemmetyinen, M. Sandells, N. Rutter, P. Siqueira, A. Nolin, B. Osmanoglu, C. Vuyovich, E. Kim, D. Taylor, I. Merkouriadi, L. Brucker, M. Navari, M. Dumont, R. Kelly, R. S. Kim, T.-H. Liao, F. Borah, X. Xu   +27 more
doaj   +1 more source

Dependence of thermal conductivity of snow on microstructure

Journal of Earth System Science, 2008
A geometrical model, including different geometrical shapes influencing thermal conductivity of snow is proposed. The geometrical model has been assumed to comprise of unit cells having solid (ice) inclusion as an aggregation of spherical, cylindrical or cubical shapes with vertical connection, arranged in a cubic packing.
P. K. Satyawali, A. K. Singh
openaire   +2 more sources