气候变化领域集成服务门户(CCPortal): Specific surface area (SSA) and thickness distribution measured during X-ray microtomographic observations of wet-snow metamorphism in a cold laboratory, link to Zip archive

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DOI	https://doi.org/10.1594/PANGAEA.874393
	Specific surface area (SSA) and thickness distribution measured during X-ray microtomographic observations of wet-snow metamorphism in a cold laboratory, link to Zip archive
	Avanzi; Francesco; Petrucci; Giacomo; Matzl; Margret; Schneebeli; Martin; De Michele; Carlo
发布日期	2017-04-10
数据集类型	dataset
英文简介	We performed X-ray microtomographic observations of wet-snow metamorphism during controlled continuous melting and melt-freeze events in the laboratory. Three blocks of snow were sieved into boxes and subjected to cyclic, superficial heating or heating-cooling to reproduce vertical water infiltration patterns in snow similarly to natural conditions. Periodically, samples were taken at different heights and scanned. Results suggest that wet-snow metamorphism dynamics are highly heterogeneous even in an initially homogeneous snowpack. Consistent with previous work, we observed an increase with time in the thickness of the ice structure, which is a measure of grain size. However, this was coupled with large temporal scatter between consecutive measurements of the specific surface area and of the statistical moments of grain thickness distributions. Because of marked differences in the right tail, grain thickness distributions did not show shape invariance with time, contrary to previous analyses. In our experiments, wet-snow metamorphism showed two strikingly different patterns: homogeneous coarsening superimposed by faster heterogeneous coarsening in areas that were affected by preferential percolation of water. Liquid water movement in snow and fast structural evolution may be thus intrinsically coupled by early formation of preferential flow at local scale. These observations suggest that further experiments are highly needed to fully understand wet-snow metamorphism and infiltration patterns in a natural snowpack.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216527
推荐引用方式 GB/T 7714	Avanzi,Francesco,Petrucci,et al. Specific surface area (SSA) and thickness distribution measured during X-ray microtomographic observations of wet-snow metamorphism in a cold laboratory, link to Zip archive.2017-04-10.https://doi.org/10.1594/PANGAEA.874393.