globalchange  > 过去全球变化的重建
DOI: 10.1016/j.epsl.2016.11.041
论文题名:
The layered evolution of fabric and microstructure of snow at Point Barnola, Central East Antarctica
作者: Neige Calonnea; ; ; Maurine Montagnatb; Margret Matzla; Martin Schneebelia
刊名: Earth and Planetary Science Letters
ISSN: 0012-837X
出版年: 2017
卷: Volume 460, 页码:Pages 293-301
语种: 英语
英文关键词: snow microstructure ; c-axis orientation ; temperature gradient metamorphism ; Antarctica
英文摘要: Snow fabric, defined as the distribution of the c-axis orientations of the ice crystals in snow, is poorly known. So far, only one study exits that measured snow fabric based on a statistically representative technique. This recent study has revealed the impact of temperature gradient metamorphism on the evolution of fabric in natural snow, based on cold laboratory experiments. On polar ice sheets, snow properties are currently investigated regarding their strong variability in time and space, notably because of their potential influence on firn processes and consequently on ice core analysis. Here, we present measurements of fabric and microstructure of snow from Point Barnola, East Antarctica (close to Dome C). We analyzed a snow profile from 0 to 3 m depth, where temperature gradients occur. The main contributions of the paper are (1) a detailed characterization of snow in the upper meters of the ice sheet, especially by providing data on snow fabric, and (2) the study of a fundamental snow process, never observed up to now in a natural snowpack, namely the role of temperature gradient metamorphism on the evolution of the snow fabric. Snow samples were scanned by micro-tomography to measure continuous profiles of microstructural properties (density, specific surface area and pore thickness). Fabric analysis was performed using an automatic ice texture analyzer on 77 representative thin sections cut out from the samples. Different types of snow fabric could be identified and persist at depth. Snow fabric is significantly correlated with snow microstructure, pointing to the simultaneous influence of temperature gradient metamorphism on both properties. We propose a mechanism based on preferential grain growth to explain the fabric evolution under temperature gradients. Our work opens the question of how such a layered profile of fabric and microstructure evolves at depth and further influences the physical and mechanical properties of snow and firn. More generally, it opens the way to further studies on the influence of the snow fabric in snow processes related to anisotropic properties of ice such as grain growth, mechanical response, electromagnetic behavior.
URL: http://www.sciencedirect.com/science/article/pii/S0012821X10007570
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11851
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性

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Recommended Citation:
Neige Calonnea,,,et al. The layered evolution of fabric and microstructure of snow at Point Barnola, Central East Antarctica[J]. Earth and Planetary Science Letters,2017-01-01,Volume 460
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