气候变化领域集成服务门户(CCPortal): Imaging air volume fraction in sea ice using non-destructive X-ray tomography

CCPortal

DOI	10.5194/tc-10-1125-2016
	Imaging air volume fraction in sea ice using non-destructive X-ray tomography
	Crabeck O.; Galley R.; Delille B.; Else B.; Geilfus N.-X.; Lemes M.; Roches M.D.; Francus P.; Tison J.-L.; Rysgaard S.
发表日期	2016
ISSN	19940416
卷号	10 期号:3
英文摘要	Although the presence of a gas phase in sea ice creates the potential for gas exchange with the atmosphere, the distribution of gas bubbles and transport of gases within the sea ice are still poorly understood. Currently no straightforward technique exists to measure the vertical distribution of air volume fraction in sea ice. Here, we present a new fast and non-destructive X-ray computed tomography technique to quantify the air volume fraction and produce separate images of air volume inclusions in sea ice. The technique was performed on relatively thin (4–22cm) sea ice collected from an experimental ice tank. While most of the internal layers showed air volume fractions < 2 %, the ice-air interface (top 2 cm) systematically showed values up to 5 %. We suggest that the air volume fraction is a function of both the bulk ice gas saturation factor and the brine volume fraction. We differentiate micro bubbles (Ø < 1 mm), large bubbles (1 mm < Ø < 5 mm) and macro bubbles (Ø > 5 mm). While micro bubbles were the most abundant type of gas bubbles, most of the air porosity observed resulted from the presence of large and macro bubbles. The ice texture (granular and columnar) as well as the permeability state of ice are important factors controlling the air volume fraction. The technique developed is suited for studies related to gas transport and bubble migration. © Author(s) 2016.
学科领域	air bubble; air-ice interaction; air-sea interaction; brine; gas exchange; gas transport; permeability; porosity; sea ice; vertical distribution; volume; X-ray
语种	英语
scopus关键词	air bubble; air-ice interaction; air-sea interaction; brine; gas exchange; gas transport; permeability; porosity; sea ice; vertical distribution; volume; X-ray
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/119641
作者单位	Department of Geological Sciences, Centre for Earth Observation, University of Manitoba, Winnipeg, MB, Canada; Unité d'Océanographie Chimique, MARE, Université de Liège, Liège, Belgium; Department of Geography, University of Calgary, Calgary, AB, Canada; Arctic Research Centre, Aarhus University, Aarhus, Denmark; Centre Eau terre et Environement, INRS-Été-Quebec, Quebec, Canada; Laboratoire de Glaciologie, DSTE, Université Libre de Bruxelles, Bruxelles, Belgium; Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland
推荐引用方式 GB/T 7714	Crabeck O.,Galley R.,Delille B.,et al. Imaging air volume fraction in sea ice using non-destructive X-ray tomography[J],2016,10(3).
APA	Crabeck O..,Galley R..,Delille B..,Else B..,Geilfus N.-X..,...&Rysgaard S..(2016).Imaging air volume fraction in sea ice using non-destructive X-ray tomography.Cryosphere,10(3).
MLA	Crabeck O.,et al."Imaging air volume fraction in sea ice using non-destructive X-ray tomography".Cryosphere 10.3(2016).