Article (Scientific journals)
Imaging air volume fraction in sea ice using non-destructive X-ray tomography
Crabeck, O; Galley, R.J.; Delille, Bruno et al.
2016In The Cryosphere, 10, p. 1125-1145
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Abstract :
[en] 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 (4–22 cm) 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 (1mm<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.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Crabeck, O
Galley, R.J.
Delille, Bruno  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Else, B.G.T.
Geilus, N.-X.
Lemes, M.
Des Roches, M.
Francus, P.
Tison, J.-L.
Rysgaard, S.
Language :
English
Title :
Imaging air volume fraction in sea ice using non-destructive X-ray tomography
Publication date :
May 2016
Journal title :
The Cryosphere
ISSN :
1994-0416
eISSN :
1994-0424
Publisher :
Copernicus, Katlenberg-Lindau, Germany
Volume :
10
Pages :
1125-1145
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 28 June 2016

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