气候变化领域集成服务门户(CCPortal): Relating optical and microwave grain metrics of snow: The relevance of grain shape

CCPortal

DOI	10.5194/tc-10-2847-2016
	Relating optical and microwave grain metrics of snow: The relevance of grain shape
	Krol Q.; Löwe H.
发表日期	2016
ISSN	19940416
卷号	10 期号:6
英文摘要	Grain shape is commonly understood as a morphological characteristic of snow that is independent of the optical diameter (or specific surface area) influencing its physical properties. In this study we use tomography images to investigate two objectively defined metrics of grain shape that naturally extend the characterization of snow in terms of the optical diameter. One is the curvature length λ2, related to the third-order term in the expansion of the two-point correlation function, and the other is the second moment μ2 of the chord length distributions. We show that the exponential correlation length, widely used for microwave modeling, can be related to the optical diameter and λ2. Likewise, we show that the absorption enhancement parameter B and the asymmetry factor gG, required for optical modeling, can be related to the optical diameter and μ2. We establish various statistical relations between all size metrics obtained from the two-point correlation function and the chord length distribution. Overall our results suggest that the characterization of grain shape via λ2 or μ2 is virtually equivalent since both capture similar aspects of size dispersity. Our results provide a common ground for the different grain metrics required for optical and microwave modeling of snow.
学科领域	absorption; asymmetry; curvature; grain size; microwave imagery; optical property; shape; tomography
语种	英语
scopus关键词	absorption; asymmetry; curvature; grain size; microwave imagery; optical property; shape; tomography
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119540
作者单位	WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse 11, Davos Dorf, 7260, Switzerland
推荐引用方式 GB/T 7714	Krol Q.,Löwe H.. Relating optical and microwave grain metrics of snow: The relevance of grain shape[J],2016,10(6).
APA	Krol Q.,&Löwe H..(2016).Relating optical and microwave grain metrics of snow: The relevance of grain shape.Cryosphere,10(6).
MLA	Krol Q.,et al."Relating optical and microwave grain metrics of snow: The relevance of grain shape".Cryosphere 10.6(2016).